Linking Remotely Sensed Carbon and Water Use Efficiencies with In Situ Soil Properties

The capacity of terrestrial ecosystems to sequester carbon dioxide (CO2) from the atmosphere is expected be altered by climate change and CO2 fertilization, but this projection limited our understanding how soil system interacts with plants. Understanding soil–vegetation interactions essential assess magnitude response changing climate. Here, we used profile satellite data explore role that properties play in regulating water use Data obtained for 19 ecosystem sites a warm temperate humid were investigate relationship between remotely sensed physical chemical properties. Classification regression tree results showed situ isotope (δ13C), order significant predictors (r2 = 0.39, mean absolute error (MAE) 0 0.175 gC/KgH2O) efficiency (WUE) based on Moderate Resolution Imaging Spectroradiometer (MODIS). Soil extractable calcium (Ca), land cover type (CUE) MODIS Landsat data-(r2 0.64–0.78, MAE 0.04–0.06). We gross primary productivity (GPP) derived solar-induced fluorescence (SIF) data, Orbiting Carbon Observatory-2 (OCO-2), calculate WUE CUE (referred as WUESIF CUESIF, respectively) study sites. analysis revealed organic matter magnesium (Mg), δ13C, silt content important both 0.19, 0.64 CUESIF 0.45, 0.1), respectively. Our importance Ca, (S13C facet content), predicting WUE. Insights gained highlighted biotic abiotic factors plant interactions. These types are timely critical accurate predictions respond change.