Fig. 7: Comparison of groundwater-level distributions for unhealthy and healthy vegetation vs baseline greenness.
From: Establishing ecological thresholds and targets for groundwater management
a–l, DTG frequency distribution plots for all vegetation (a–c), Salix spp. (d–f), Populus spp. (g–i) and Quercus spp. (j–l) for unhealthy (ZNDVI ≤ −1; left column), near baseline (−1 < ZNDVI < 1; centre column) and healthy (ZNDVI ≥ 1; right column) vegetation. DTG at vegetation was calculated by subtracting the water surface elevation (NADV88) from the mean land surface elevation calculated at the associated vegetation polygon (Methods). The 25th percentile of DTG at vegetation locations for each subplot is indicated by a solid red, purple or blue horizontal line. The average maximum rooting depth for the associated vegetation in the subplots is indicated by the solid black horizontal line.
