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Fig. 7 | Environmental Sciences Europe

Fig. 7

From: Italian reference rivers under the Water Framework Directive umbrella: do natural factors actually depict the observed nutrient conditions?

Fig. 7

Exemplar sites from selected AP groups, ordered by increasing water quality of the group they belong to. AP group 6 (top, left): comparatively high nitrogen atmospheric deposition; AP group 5 (top, right): artificial land use in the catchment sometimes above reference site thresholds; AP group 3 (bottom, left): natural land use dominant in the catchment; comparatively high oxygen saturation levels; AP group 2 (bottom, right): natural land use largely dominant in the catchment, nutrients concentration very low (best observed reference sites)

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