- Open Access
Will climate change increase irrigation requirements in agriculture of Central Europe? A simulation study for Northern Germany
© Riediger et al.; licensee Springer. 2014
- Received: 6 January 2014
- Accepted: 9 July 2014
- Published: 22 July 2014
By example of a region in Northern Germany (County of Uelzen), this study investigates whether climate change is likely to require adaption of agricultural practices such as irrigation in Central Europe. Due to sandy soils with low water retention capacity and occasional insufficient rainfall, irrigation is a basic condition for agricultural production in the county of Uelzen. Thus, in the framework of the comprehensive research cluster Nachhaltiges Landmanagement im Norddeutschen Tiefland (NaLaMa-nT), we investigated whether irrigation might need to be adapted to changing climatic conditions. To this end, results from regionalised climate change modelling were coupled with soil- and crop-specific evapotranspiration models to calculate potential amounts of irrigation to prevent crop failures. Three different runs of the climate change scenario RCP 8.5 were used for the time period until 2070.
The results show that the extent of probable necessary irrigation will likely increase in the future. For the scenario run with the highest temperature rise, the results suggest that the amount of ground water presently allowed to be extracted for irrigation might not be sufficient in the future to retain common agricultural pattern.
The investigation at hand exemplifies data requirements and methods to estimate irrigation needs under climate change conditions. Restriction of ground water withdrawal by German environmental regulation may require an adaptation of crop selection and alterations in agricultural practice also in regions with comparable conditions.
- European Water Framework Directive
- Soil moisture
- Water availability
- Water and Substance Simulation Model
Current projections of global climatic change strongly support the expectation that during the next few decades, global temperatures will continue to increase as well as spatial and temporal patterns of temperature and precipitation will be shifting [,]. This may have implications for many environmental processes which are influenced by thermal and soil moisture conditions. The increase in temperature for instance could lead to soil moisture deficits and a growing risk of vegetation desiccation due to increasing evapotranspiration and decreasing soil moisture [,]. Ecological and economic consequences for European agricultural ecosystems are expected to vary widely according to the spatial patterns of land cover, land use practise and regional climate change [–]. Anyway, referring for instance to Europe, according to the EU Water Framework Directive (WFD 2000/60/EC) [], a good ecological status of surface and ground water has to be achieved. To safeguard sustainable water management, vulnerability assessments [] and adaptation strategies based on estimates of irrigation demands are needed [–]. Such appraisals should be, as far as possible, spatially explicit across scales - form the local to the global [–] - and should regard spatial variability in terms of agricultural regions [] and natural landscapes. As holds true for the estimation of the meteorological aspects of climate change, modelling techniques of its ecological (and economical) impacts should be used [].
Global agriculture used about 2,600 km3 of water each year since the year 2000, i.e. 2% of annual precipitation over land and 17 mm of water spread evenly over the global land surface. This is a +75% increase from 1960 levels and a +400% increase from 1900 levels of irrigation. Out of the world’s croplands, 18%, i.e. about 2% of the total land surface, are irrigated and produced 40% of the world’s food. On average, the irrigated areas receive an addition of 800 mm of water each year []. About 70% of all water withdrawn worldwide from rivers and aquifers are used for agriculture []. To estimate the pressure of irrigation on the available water resources, irrigation water requirement and irrigation water withdrawal have to be assessed [], including strategies for enhancing the water use efficiency []. Irrigation water requirement depends on the crop water requirement and the water naturally available to the crops (effective precipitation, soil moisture, etc.). About 2% of the global land area and 17% of the cultivated area, respectively, are irrigated. In Europe, 44% of the total water withdrawal is used for agriculture []. The total area equipped for irrigation, i.e. the total irrigable area in EU-27 accounts for roughly 16 million ha in 2003 and 15 million ha in 2007 on a total of 172 million ha of agricultural land; however, about 10 million ha was actually irrigated in 2007 []. In Germany, the area equipped for irrigation totals about 516,000 ha, and ca. 235,000 ha of them were irrigated []. In the federal state of Lower Saxony, comprising the county of Uelzen, about 3,000,000 ha, i.e. about 50% of the irrigated area of Germany is located. This irrigated area covers 11.5% of the agricultural land of Lower Saxony. In the county of Uelzen, roughly 58,000 ha are reported to be equipped for irrigation and 90% of the crop land is currently irrigated [–].
It is a current research task to assess whether for specific processes, regions and crops adaptation requirements will emerge under climate change conditions [–] to consolidate decisions on adaptation strategies to be developed and set in action. For the Northern German Lowlands, the research project ‘Sustainable Land Management in the North German Lowland’ (acronym, NaLaMa-nT, see http://www.nalama-nt.de/, funded by the Federal Ministry of Education and Research) currently evaluates agricultural implications.
On average, 73 mm/m2 and year of ground water are used for irrigation in the county of Uelzen []. The guarantee of adequate water availability became a fundamental condition for the local economy []. The amount of ground water allowed to be taken for irrigation differs within the county. The local authorities have currently set ground water use for irrigation to a maximum of 79 mm/m2 and year with a moving average over 7 years in order to avoid depletion []. On average, 59.2% of the permitted amount of extracted ground water was used per year in the time period 1997 to 2004. In the low-rainfall year 2003, 125% was used. Increasing abstraction of ground water could cause negative ecological consequences, e.g. the endangerment of wetlands in the region []. The county of Uelzen belongs to the Elbe river basin which is the driest amongst the five largest river basins in Germany. There, the vulnerability against water stress in dry periods is currently a problem for agriculture. This scarcity is expected to increase with subsequent adverse impacts [].
Climate change not only affects water availability but also the demand for water. If the climate in a given region gets drier and warmer, water availability will decrease and be exacerbated by increasing water demand []. Soil water content and therewith irrigation in agriculture is likely to be affected by higher temperature. Evapotranspiration sensitively depends on temperature regimes []. For temperate regions with a highly variable rainfall pattern, it is difficult to predict to which extent temperature changes will require a modification of agricultural practices. We use regional climate model data generated by STARS II [] based on the RCP 8.5 scenario together with information on regional soil conditions [], crop types and pattern of the current agricultural practice (by courtesy of J. Hufnagel and N. Svoboda, Leibnitz Centre for Agricultural Landscape Research (ZALF), Müncheberg, Germany) to assess whether it would be possible to continue the current cultivation pattern in Uelzen or whether adaptations and changes of the current irrigation pattern and crop management would be necessary to avoid critical conditions and crop losses - based on the assumption of a validity of the climate change scenario. Therefore, we developed the evaporation calculation model BewUe (Bewässerung (irrigation) Uelzen) to estimate the irrigation requirement using soil water content as an indicator. The presented work is part of a larger crop rotation simulation endeavour covering further Northern German regions. The computed irrigation data are essential for preparing the study of current and future water, carbon and nitrogen balances within the NaLaMa-nT project. For this purpose, the Water and Substance Simulation Model (WASMOD, []) was used.
To compute the moving average for the year 1991, the values for the six previous years 1985 to 1990 have been considered. For the year 2011, the values for the years 2005 to 2010 of the reference period 1991 to 2010 were considered. The simulated crop rotation starts with the cultivation of sugar beet in the year 1991.
The amount of water extracted for irrigation depends on climate and soil characteristics, on the political and economic boundary conditions, and on farmers’ management decisions such as crops cultivated and techniques applied, as for instance, irrigation []. The results of this simulation study conducted in Northern Germany (County of Uelzen) show that together with increasing temperature and evapotranspiration, the irrigation requirements are likely to increase also (Figures 3, 5, and 6). On the basis of the scenario calculations, higher irrigation levels will most likely be required in the future (except scenario run Tmin). This could exceed local availability of ground water. Implications could be, on the one hand, the endangerment of regional wetlands [] when the ground water level should substantially decrease due to irrigation water extraction. On the other hand, crop damage or crop failure could become more common - if the land use management would not be adapted.
Both, changes in average climate conditions during the main growing season and climate variability, particularly heat waves and droughts, affect crop growth. The fitting capacity to cope with climate change depends on the crop type and ecological boundary conditions []. Thus, additional irrigation requirements can be avoided or reduced by a reasonably adapted choice of the cultivated field crops []. With an accompanying climate change, dates for sowing could be shifted - to a limited extent - to earlier times in the year to use the natural water supply during the wet months in spring more efficiently []. At present, irrigation is mainly applied using long-throw sprinkler []. If irrigation efficiency would be improved by the application of techniques with lower evaporation losses (e.g. drip irrigation), the potential problems might be reduced. In some places the use of surface water for irrigation could also be adequately adjusted and contribute to the irrigation requirements [].
In general, scenario data - like the results shown in this paper - go along with uncertainties and are just adequate to point out possible future trends. The uncertainties in the presented calculation approach originate amongst others from climate projection data, which are linked to uncertainties themselves. For example, the used scenario data seems to predict too low evapotranspiration amounts (Figure 3). This implies that the future irrigation requirement could be even higher than the calculated values indicate (Figures 5 and 6). The presented results in particular show how irrigation requirement in the county of Uelzen could develop in the future based on the employed scenario specifications.
The presented calculation approach can be understood as being based on conservative assumptions. In reality, irrigation arrangements are likely to be done at even higher soil water contents (e.g. at 30% to 50% of the available field capacity) and with higher amounts of irrigation water than 20 mm/m2 and irrigation event. This leads to the assumption that the computed irrigation levels are even lower than they actually could be in the future.
In a few exceptional years, the soil water content might be lower at starting day 107 than the default start value due to a noticeably dry winter. In these cases the irrigation requirement could be higher than the calculated values indicate. Nevertheless, it could be shown that as by 2010, assuming the worst case scenario from down-scaled global climate change models, 62% to 80% of agricultural land within a Central European region could shift towards a new agroclimatic class and 98% by 2050, respectively [].
It is important to emphasise that irrigation requirements cannot be directly derived from climate modelling. In fact, outcomes of climate modelling need to be linked with data on soil conditions, cultivation patterns and eventually also economic considerations in order to assess future sustainability of particular crops to be grown and the resulting requirements of external water input. Calculations were done with evapotranspiration data for grassland [] based on simulated climate data []. This leads to uncertainties because the evapotranspiration for grassland can differ from agricultural sites depending on plant development stage and crop species. We checked this by computing evapotranspiration with a standalone model approach (Figure 4). The WASMOD results show that the evapotranspiration for sugar beet and potato differs only to a relatively low extent compared to grassland (approximately +9% and −10% on average during the irrigation phase). The variance for winter barley and winter rye is higher compared to grassland (approximately +34% and +39% on average during the irrigation phase). As winter barley and winter rye are harvested early in the year (days 177 and 198), this affects a time period when irrigation requirement is relatively low as the soil retains water from the winter period. The calculation of crop-specific transpiration in combination with plant phenology is appropriate []; however, it would only gradually reduce remaining uncertainties. The current approach was based on Penman-Monteith calculations [] for site-specific conditions.
In future research activities, it will be intended to expand the calculations to additional regions, soil types and crop rotations. This would be of high relevance since the European agriculture is characterised by high productivity [] and accounts for 50% of the global trade food products [].
Furthermore, the presented results for irrigation amounts obtained using the BewUe programme should be cross-checked with observation data for single field crops and different years. But such observation data are not available yet. Additionally, further climate change scenarios are of interest and should be used to improve understanding of the possible future irrigation requirement.
The results show that it is reasonable to expect that regional implications of global climate change will affect evapotranspiration as an important aspect in crop cultivation. Ground water availability for irrigation allows, under the given conditions, a short-term buffering towards extremes. Based on the scenario calculations, it can be expected that the current agricultural practice in the county of Uelzen will not be directly limited by regional climatic alterations. However, in the more distant future, where climate change is on the one side to become more pronounced and more uncertain to be predicted on the other side, additional measures might be necessary to prevent higher frequencies of crop failures in some years. Changes in irrigation techniques or adaptation of crop rotation types are amongst these measures. The presented work shows how irrigation requirement can be calculated combining regional projections of climate conditions specified as long-term ‘scenario-weather’, combined with crop requirements and management, and soil conditions. The results show that it is likely that agriculture in the county of Uelzen has to be adapted to increasing irrigation requirement in the future, if conditions develop as assumed in the employed scenarios.
However, further research will give evidence whether changes either in institutional and market conditions or in climatic conditions will dominantly influence the development of agriculture illustrated by a comparable example of adaptation for maize production in Switzerland []. Since soil climate is expected to change significantly even in Central Europe, ‘more attention should be paid to studying the impacts of climate change on soil climate’ [], i.e. soil temperature and hydric soil regimes.
Homogenised daily climate observation and scenario data for the climate change scenario Representative Concentration Pathways (RCP) 8.5 were provided by the Potsdam Institut für Klimafolgenforschung (PIK) to the NaLaMa-nT project consortium for a 10 × 10 km grid and the time periods 1951 to 2010 [] and 2011 to 2070 [], respectively (see Figure 3). Observation data of the German weather service [] were checked, homogenised and interpolated to the 10-km grid []. The scenario data are generated by STARS II [] and interpolated to the same grid. Our calculations were done for one grid cell located in the County of Uelzen (Figure 1), which was selected because it has the highest representativity for the county of Uelzen. Data for this grid cell show the lowest sum of deviations for the parameters of daily mean temperature, precipitation, and global radiation compared to the county average. To assess the RCP 8.5 scenario of the STARS II model scenario, backward-extrapolated scenario data for the time period 1951 to 2010 were provided and were compared to the observation data. The RCP 8.5 scenario is the most fierce emission scenario in the recent IPCC assessment [,,]. Nevertheless, the RCP 8.5 scenario is surpassed by actually observed emissions []. It is up to the year 2060 the most similar emission scenario to the so far widely used SRES A1B scenario []. The used STARS II projections (Tmin, Tmed, Tmax) were driven by different temperature gradients. For each projection, the median run - based on the change of climate water balance - of 100 model runs was selected. The three projections Tmin, Tmed and Tmax are based on results from the GCM models INM-CM4 (Institute of Numerical Mathematics, Russian Academy of Sciences, Moscow, Russia, 2009), ECHAM6 (Max Planck Institute for Meteorology, Hamburg, Germany, 2012) and ACCESS1.0 (Commonwealth Scientific and Industrial Research Organisation, Melbourne, Australia, 2013). They represent a low, median and high temperature increase for the RCP 8.5 scenario.
To calculate changes in soil humidity, we used additional data for evapotranspiration, which were available for grassland correspondent to the guidelines of the Food and Agriculture Organization of the United Nations (FAO) computed by the Penman-Monteith equation [] but not for single field crops (homogenised data source for the time period 1951 to 2010 [] and scenario data for the time period 2011 to 2070 []). The scenario input data are shown in Figure 3. We used WASMOD [] to compare the evapotranspiration amounts of different grassland types and crop species. They are in the expected order of magnitude, considering the condition that actual plant transpiration is a highly variable process leading to large standard deviations when measured in repeated experiments [] (Figure 4).
The daily average temperature, precipitation and evapotranspiration show a high variance within the different years for the reference period 1991 to 2010 and in all scenario runs (Figure 3). This means that e.g. the general increase in temperature in scenario run Tmax is also interrupted by several years with low daily mean temperatures. The daily mean temperature is increasing in the time period 2011 to 2070 in the scenario runs Tmed and Tmax with +1.3 and +1.7°C in the time period 2011 to 2070, respectively. In the scenario run Tmin, there is a minor increase of +0.9°C on average. The annual evapotranspiration is +5.6 and +28.4 mm per year on average higher in the scenario runs Tmed and Tmax compared to the reference period 1991 to 2010. In the scenario run Tmin, the annual evapotranspiration is decreasing with −8.7 mm per year on average compared to the reference period 1991 to 2010. Concerning the annual rainfall, there is no clear trend indicating changes compared to the current situation. The annual rainfall is 654.4 mm per year during the reference period 1991 to 2010. On average, the annual rainfall is increasing in all scenario runs with +44.7 in Tmin, +45.0 in Tmed and +14.1 mm per year in Tmax compared to the reference period 1991 to 2010. Several climate scenarios also show that the main amount of the yearly precipitation will shift from the growing season (spring and summer) towards the time outside the vegetation period (i.e. winter) [] or that the annual precipitation will even decrease []. This could also influence irrigation requirement.
Figure 3 also show that the modelled scenario data seem to be lower than in reality by comparing the measured climate data and the backward-extrapolated scenario data for the reference period 1991 to 2010. Temperature (Figure 3a) and especially evapotranspiration (Figure 3c) are decreasing after 2010 compared to the measured data in the reference period. Thus, irrigation requirement - calculated with observation data for the reference period and scenario data for the time period 2011 to 2070 - could be even higher in years after 2010 than the calculated values indicate.
Soil data of the land use-specific soil map of Germany [] were used. The county of Uelzen is dominated by sandy soil types with low amounts of silt and/or clay (Figure 1). Because of the coarse-grained texture, these soils have a low available field capacity (approximately 17% to 22% in a soil depth of 0 to 30 cm) []. Soils in eastern Lower Saxony show a soil water deficit in some places during the growing season [].
Crop plants grown in Uelzen with dates for harvesting and starting time of maturity
Share of agricultural area (%)
Harvest time (day in year)
Start time of maturity (day in year)
Winter rapeseed with organic fertilisation
For the calculations we used data for soil type 31 (brown podzolic soil out of slightly loamy, slightly silty sand and sand), which is the soil type most common in the county’s agricultural area (47%) (Figure 1). Soil type 31 has a field capacity of 24% (which is equivalent to a soil water content of 240 l/m3), an available water capacity of 17% and a wilting point of 7% (which is equivalent to 70 l/m3 of stagnant water) in a soil depth of 0 to 60 cm []. The soil depth of 0 to 60 cm was assumed to be the rooting zone of the soil and therefore the relevant part of the soil considered in our calculations.
The maximum soil water content is defined as ≤ 240 l/m3 (soil water content at field capacity) and the minimum soil water content as ≥ 70 l/m3 (amount of stagnant water).
The soil water content decreases noticeably after day 107 in an average year (Figure 7). In average years, irrigation should not be required before day 107. The climatic water balance gets negative from day 107 onwards because of an increasing evapotranspiration that is not compensated by precipitation. Thus, the calculation of the soil water content within the BewUe model was set to start at day 107 with an actual value of 224.9 l/m3. Starting time and start value are considered representative for average climate conditions in the county of Uelzen and were used to compute the irrigation requirement for all different scenario runs, years and crop species.
Irrigation was considered unnecessary during the maturation phase of the field crops. In general, maturation takes between 2 and 4 weeks depending on the yearly course of the weather (J. Hufnagel and N. Svoboda, ZALF, Müncheberg, Germany, personal communication). In our calculations, we assumed that maturation starts 3 weeks before harvesting in all years and different scenario runs. Harvest dates differ between the relevant crops (Table 1). Thus, the soil water content and irrigation requirement for e.g. sugar beet were computed from day 107 with a start value of 224.9 l/m3 until day 269 (i.e. start of maturation). The crop plants listed in Table 1 grow on 90% of the currently cultivated agricultural area in the county of Uelzen. In particular, the cultivation of sugar beet and potato, which are grown on 46% of the whole agricultural crop land, is linked to a high irrigation requirement [].
Temporal trends for irrigation requirements are secured statistically by computing the Kendall’s tau b as correlation coefficient (Figure 5). The Mann-Kendall test is the adequate method for non-parametric tests and it is not influenced by seasonal effects.
The NaLaMa-nT project and the presented work are funded by the Federal Ministry of Education and Research under research grant 033L029H. We thank N. Svoboda and J. Hufnagel (Leibnitz Centre for Agricultural Landscape Research (ZALF), Müncheberg, Germany) for the provision of crop rotation and crop management information.
- Intergovernmental Panel on Climate Change (IPCC): Climate Change 2013: The Physical Science Basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change. In Edited by Stocker TF, Qin D, Plattner G-K, Tignor M, Allen SK, Boschung J, Nauels A, Xia Y, Bex V, Midgley PM. Cambridge, United Kingdom and New York, NY, USA: Cambridge University Press; 2013:1535.Google Scholar
- Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Cambridge University Press, Cambridge; 2007.Google Scholar
- Goyal RK: Sensitivity of evapotranspiration to global warming. A case study of arid zone of Rajasthan (India). Agric Water Manag 2004, 69: 1–11. 10.1016/j.agwat.2004.03.014View ArticleGoogle Scholar
- Rind D, Goldberg R, Hansen J, Rosenzweig C, Ruedy R: Potential evapotranspiration and the likelihood of future drought. J Geophys Res Atmos 1990, 95(7):9983–10004. 10.1029/JD095iD07p09983View ArticleGoogle Scholar
- Bindi M, Olesen JE: The responses of agriculture in Europe to climate change. Reg Environ Chang 2011, 11(Suppl 1):151–158. 10.1007/s10113-010-0173-xView ArticleGoogle Scholar
- Ciscar J-C: The impacts of climate change in Europe (the PESETA research project). Clim Chang 2012, 112: 1–6. 10.1007/s10584-011-0336-xView ArticleGoogle Scholar
- Iglesias A, Garrote L, Quiroga S, Moneo M: A regional comparison of the effects of climate change on agricultural crops in Europe. Clim Chang 2012, 112: 29–46. 10.1007/s10584-011-0338-8View ArticleGoogle Scholar
- Directive 2000/60/EC of the European Parliament and of the Council of 23 October 2000 establishing a framework for community action in the field of water policy. OJ L 2000, 327: 1–73.Google Scholar
- Tzilivakis J, Warner DJ, Green A, Lewis KA: Adapting to climate change: assessing the vulnerability of ecosystem services in Europe in the context of rural development. Mitig Adapt Strateg Glob Chang 2013, 1–26. doi:10.1007/s11027–013–9507–6.Google Scholar
- Wriedt G, Van der Velde M, Aloe A, Bouraoui F: Water requirements for irrigation in the European Union. A model based assessment of irrigation water requirements and regional water demands in Europe, Scientific and Technical Research series. European Commission, Joint Research Centre Institute for Environment and Sustainability, Ispra; 2008.Google Scholar
- Calzadilla A, Rehdanz K, Betts R, Falloon P, Wiltshire A, Tol RSJ: Climate change impacts on global agriculture. Clim Chang 2013, 120: 357–374. 10.1007/s10584-013-0822-4View ArticleGoogle Scholar
- Chaturvedi V, Hejazi M, Edmonds J, Clarke L, Kyle P, Davies E, Wise M: Climate mitigation policy implications for global irrigation water demand. Mitig Adapt Strateg Glob Chan 2013, 1–19. doi:10.1007/s11027–013–9497–4.Google Scholar
- Christensen OB, Goodess CM, Ciscar J-C: Methodological framework of the PESETA project on the impacts of climate change in Europe. Clim Chang 2012, 112: 7–28. 10.1007/s10584-011-0337-9View ArticleGoogle Scholar
- Heumesser C, Fuss S, Szolgayová J, Strauss F, Schmid E: Investment in irrigation systems under precipitation uncertainty. Water Resour Manag 2012, 26: 3113–3137. 10.1007/s11269-012-0053-xView ArticleGoogle Scholar
- González-Zeas D, Quiroga S, Iglesias A, Garrote L: Looking beyond the average agricultural impacts defining adaption needs in Europe. Reg Environ Chang 2013, 2013: 1–11. doi:10.1007/s10113–012–0388–0 doi:10.1007/s10113-012-0388-0Google Scholar
- Döll P: Impact of climate change and variability on irrigation requirements: a global perspective. Clim Chang 2002, 54: 269–293. 10.1023/A:1016124032231View ArticleGoogle Scholar
- Lehner B, Döll P, Alcamo J, Henrichs T, Kaspar F: Estimating the impact of global change on flood and drought risks in Europe: a continental, integrated analysis. Clim Chang 2006, 75: 273–299. 10.1007/s10584-006-6338-4View ArticleGoogle Scholar
- Olesen JE, Carter TR, Díaz-Ambrona CH, Fronzek S, Heidmann T, Hickler T, Holt T, Minguez MI, Morales P, Palutikof JP, Quemada M, Ruiz-Ramos M, Rubaek GH, Sau F, Smith B, Sykes MT: Uncertainties in projected impacts of climate change on European agriculture and terrestrial ecosystems based on scenarios from regional climate models. Clim Chang 2007, 81: 123–143. 10.1007/s10584-006-9216-1View ArticleGoogle Scholar
- Siebert S, Henrich V, Frenken K, Burke J: Update of the global map of irrigation areas to version 5. Project report. Institute of Crop Science and Resource Conservation, Rheinische Friedrich-Wilhelms-Universität, Bonn, Germany; 2013.Google Scholar
- Maracchi G, Sirotenko O, Bindi M: Impacts of present and future climate variability on agriculture and forestry in the temperate regions: Europe. Clim Chang 2005, 70: 117–135. 10.1007/s10584-005-5939-7View ArticleGoogle Scholar
- Jopp F, Reuter H, Breckling B: Modelling Complex Ecological Dynamics. Springer, Heidelberg; 2011.View ArticleGoogle Scholar
- Sacks WJ, Cook BI, Buenning N, Levis S, Helkowski JH: Effects of global irrigation on the near-surface climate. Clim Dyn 2009, 33: 159–175. 10.1007/s00382-008-0445-zView ArticleGoogle Scholar
- Frenken K, Gillet V: Aquastat. Irrigation water requirement and water withdrawal by country. , [http://www.fao.org/nr/water/aquastat/water_use_agr/index.stm]
- Iglesias A, Quiroga S, Moneo M, Garrote : From climate change impacts tot he development of adaption strategies: challenges for agriculture in Europe. Clim Chang 2012, 112: 143–168. 10.1007/s10584-011-0344-xView ArticleGoogle Scholar
- European Commission: Agriculture and rural development. Agriculture and environment. Agriculture and water. , [http://ec.europa.eu/agriculture/envir/water/]
- European Commission: Agri-environmental indicator. irrigation. , [http://epp.eurostat.ec.europa.eu/statistics_explained/index.php/Agri-environmental_indicator_-_irrigation#Further_Eurostat_information]
- Battermann HW, Theuvsen L: Feldberegnung in Nordost-Niedersachsen. Regionale Bedeutung und Auswirkungen differenzierter Wasserentnahmeerlaubnisse, Endbericht. Studie im Auftrag des Fachverbandes Feldberegnung 2007–2009. Georg-August-Unsiversität Göttingen, Department für Agrarökonomie und Rurale Entwicklung; , [http://www.lwk-niedersachsen.de/index.cfm/portal/6/nav/203/article/14250.html]
- Food and Agriculture Organization of the United Nations (FAO): Global map of irrigation areas. Germany. , [http://www.fao.org/nr/water/aquastat/irrigationmap/deu/index.stm]
- Fricke E: Optimierte Nährstoffausnutzung durch Bewässerung. , [http://www.fachverband-feldberegnung.de/basisinfo.htm]
- Heidt L: Auswirkungen des Klimawandels auf die potentielle Beregnungsbedürfigkeit Nordost-Niedersachsens. Geoberichte 2009, 13: 60–67.Google Scholar
- Schaller M, Weigel H-J: Analyse des Sachstands zu Auswirkungen von Klimaveränderungen auf die deutsche Landwirtschaft und Maßnahmen zur Anpassung. FAL Landbauforschung Völkenrode 2007, 316: 247p.Google Scholar
- Weichselgartner W: Risiko – Wissen – Wandel. Oeko, Strukturen und Diskurse problemorientierter Umweltforschung. München; 2013.Google Scholar
- Landwirtschaftskammer Niedersachsen (NLWKN): Projektbericht. Aquarius. Dem Wasser kluge Wege ebnen. 2012, , [http://www.lwk-niedersachsen.de/index.cfm/portal/6/nav/203/article/12396.html]
- Projektbericht. No Regret. Genug Wasser für die Landwirtschaft?!. 2008.Google Scholar
- Schröder W, Schmidt G, Pesch R, Matejka H, Eckstein T: Konkretisierung des Umweltbeobachtungsprogrammes im Rahmen eines Stufenkonzeptes der Umweltbeobachtung des Bundes und der Länder Teilvorhaben 3. Umweltforschungsplan des Bundesministers für Umwelt, Naturschutz und Reaktorsicherheit, Berlin; 2001.Google Scholar
- German Weather Service (DWD). 2010.Google Scholar
- Krysanova V, Dickens C, Timmerman J, Varela-Ortega C, Schlüter M, Roest K, Huntjens P, Jaspers F, Buiteveld H, Moreno E, de Pedraza Carrera J, Slámová R, Martínková M, Blanco I, Esteve P, Pringle K, Pahl-Wostl C, Kabat P: Cross-comparison of climate change adaption strategies across large river basins in Europe, Africa and Asia. Water Resour Manag 2010, 24: 4121–4160. 10.1007/s11269-010-9650-8View ArticleGoogle Scholar
- Bloemer S: Ingenieurbiologie und Klimawandel. Worauf sich Planer und Unternehmen einstellen müssen. Neue Landschaft 2008, 8: 46–53.Google Scholar
- Orlowsky B, Gerstengarbe FW, Werner PC: A resampling scheme for regional climate simulations and its performance compared to a dynamical RCM. Theor Appl Climatol 2008, 92(3–4):209–223. 10.1007/s00704-007-0352-yView ArticleGoogle Scholar
- Use-specific soil map 1:1.000.000 (BÜK 1000 N2.3). Digit. Archiv FISBo BGR, Hannover and Berlin; 2007.Google Scholar
- Reiche EW: Entwicklung, Validierung und Anwendung eines Modellsystems zur Beschreibung und flächenhaften Bilanzierung der Wasser- und Stickstoffdynamik in Böden. Kieler Geographische Schriften 1991, 79: 1–150.Google Scholar
- Finger R, Hediger W, Schmid S: Irrigation as adaption strategy to climate change—a biophysical and economic appraisal for Swiss maize production. Clim Chang 2011, 105: 509–528. 10.1007/s10584-010-9931-5View ArticleGoogle Scholar
- Moriondo M, Bindi M, Kundzewicz ZW, Szwed M, Chorynski A, Matczak P, Radziejewski M, McEvoy D, Wreford A: Impact and adaptation opportunities for European agriculture in response to climatic change and variability. Mitigation Adaptation Strategies Global Change 2010, 15: 657–679. 10.1007/s11027-010-9219-0View ArticleGoogle Scholar
- Trnka M, Eitzinger J, Semerádivá D, Hlavinka P, Balek J, Dubrovský M, Kubu G, Štˇepánek P, Thaler S, Možný M, Žalud Z: Expected changes in agroclimatic conditions in Central Europe. Clim Chang 2011, 108: 261–289. 10.1007/s10584-011-0025-9View ArticleGoogle Scholar
- Allen RG, Pereira LS, Raes D, Smith M: Crop Evapotranspiration. Guidelines for Computing Crop Water Requirements. FAO irrigation and drainage paper. vol 56. 1998.Google Scholar
- Ma S, Churkina G, Trusilova K: Investigating the impact of climate change on crop phonological events in Europe with a plant phenology model. Int J Biometeorol 2012, 56: 749–763. 10.1007/s00484-011-0478-6View ArticleGoogle Scholar
- Mariani L, Parisi SG, Cola G, Failla O: Climate change in Europe and effects on thermal resources for crops. Int J Biometeorol 2012, 1–12. doi:10.1007/s00484–012–0528–8.Google Scholar
- Trnka M, Kersebaum KC, Eitzinger J, Hayes M, Hlavinka P, Svoboda M, Dubrovský M, Semerádová D, Wardlow B, Pokorný E, Možný M, Wilhite D, Zdeněk Ž: Consequences of climate change for the soil climate in Central Europe and the central plains of the United States. Clim Chang 2013, 120: 405–418. 10.1007/s10584-013-0786-4View ArticleGoogle Scholar
- Österle H, Gerstengarbe F-W, Werner PC: Ein neuer meteorologischer Datensatz für Deutschland, 1951 – 2003, Proceedings der 7. Deutschen Klimatagung 2006. Klimatrends: Vergangenheit und Zukunft, Meteorologisches Institut der Ludwig-Maximilians-Universität, München: 3p.Google Scholar
- Moss RH, Edmonds JA, Hibbard KA, Manning MR, Rose S: The next generation of scenarios for climate change research and assessment. Nature 2010, 463: 747–756. 10.1038/nature08823View ArticleGoogle Scholar
- van Vuuren DP, Edmonds J, Kainuma M, Riahi K, Thomson A, Hibbard K, Hurtt GC, Kram T, Krey V, Lamarque J-F, Masui T, Meinshausen M, Nakicenovic N, Smith SJ, Rose SK: The representative concentration pathways: an overview. Clim Chang 2011, 109: 5–31. 10.1007/s10584-011-0148-zView ArticleGoogle Scholar
- Peters GP, Andrew RM, Boden T, Josep Canadell G, Ciais P, Le Quéré C, Marland G, Raupach MR, Wilson C: The challenge to keep global warming below 2°C. Nat Clim Chang 2013, 3: 4–6. 10.1038/nclimate1783View ArticleGoogle Scholar
- Korres W: Analysis of surface soil moisture patterns in an agricultural landscape utilizing measurements and ecohydrological modelling. PhD Thesis. University of Cologne, Germany; 2013.Google Scholar
- Sutmöller J, Spellmann H, Fiebiger C, Albert M: Der Klimawandel und seine Auswirkungen auf die Buchenwälder in Deutschland. Beiträge aus der NW-FVA 2008, 3: 135–158.Google Scholar
- Dahl O, Myrhaug G, Nygaard K: SIMULA 67. Common base language. Technical report publication. 1968.Google Scholar
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