Compound drought constrains gross primary productivity in Chinese grasslands

Abstract Water constraints disturb and damage the growth development of grassland vegetation mainly through both atmospheric soil pathways. In background rapid climate change in future, impacts water on grasslands are expected to further deepen. However, current studies lack reports exploring frequency, intensity, area land-atmospheric compound drought carbon indicators ecosystems. this study, we analyze response China dual terrestrial-atmospheric constraint events using ISIMIP gross primary productivity (GPP) data reveal cycle-climate feedback relationships over Chinese grassland. We found that occurrence probability (i.e. constraint) was 3–4 times higher than random events, affected droughts were significantly single droughts. Compound caused a decline up 20.27% GPP ecosystems China, while or only 12.34% 14.32%. Which is because vapor pressure deficit moisture set strongly coupled bivariate variables, continued strengthening causes an increased impact ecosystem GPP.