Fig. 4
From: Bracken growth, toxin production and transfer from plant to soil: a 2-year monitoring study
Concentrations of PTA (a) and PTB (b) in soil pore water at 50 cm depth under bracken recorded in the period from March 2019 until March 2020 (n = 1–9). Green line represents the PTATOT (PTA and PTB equivalents in term of mg of PTA) mass in the canopy during the same period. c Precipitation recorded for 10 min interval in the nearest weather station during the same period (bottom). Boxplots represent the 25th and 75th percentile, while the whiskers represent the 10th and 90th percentile. LOD shown by red line, while red stars represent observed values of measurements. Dotted line represents the median concentration for each sampling day, while average is indicated by the black line