Drought resistance across California ecosystems: evaluating changes in carbon dynamics using satellite imagery.

摘要: Drought is a global issue that exacerbated by climate change and increasing anthropogenic water demands. The recent occurrence of drought in California provides an important opportunity to examine response across ecosystem classes (forests, shrublands, grasslands, wetlands), which essential understand how influences structure function. We quantified resistance comparing changes satellite-derived estimates water-use efficiency (WUE = net primary productivity [NPP]/evapotranspiration [ET]) under normal (i.e., baseline) conditions (ΔWUE = WUE2014 − baseline WUE). With this method, areas with WUE are considered more resilient than systems declining WUE. Baseline varied (0.08 3.85 g C/mm H2O) generally increased severe 2014. Strong correlations between ΔWUE, precipitation, leaf area index (LAI) indicate ecosystems lower average LAI grasslands) also had greater C-uptake rates when was limiting higher carbon-uptake (CUE = NPP/LAI) conditions. found baseline WUE ≤ 0.4 exhibited decline conditions, suggesting might be indicative low resistance. severity, were identified as drivers shifts over the study period. These findings have implications for understanding effects on C sequestration may influence future.