Spatiotemporal Evolution Characteristics and the Climatic Response of Carbon Sources and Sinks in the Chinese Grassland Ecosystem from 2010 to 2020

With the increase in global carbon dioxide emissions, China has put forward goals of a peak and neutrality (double carbon) formulated an action plan to consolidate enhance sink capacity ecosystem. The Chinese grassland ecosystem (CGE) is widely distributed key link for achieve double objectives. However, there relative lack research on sources sinks CGE, so it urgent integrate analyze national scale. Based refined grid data, net productivity (NEP) CGE was estimated by coupling vegetation production model soil respiration model. results showed that cumulative sequestration 14.46 PgC from 2010 2020. In terms spatial distribution, this shows differentiation characteristics are high northwest low southeast China, which strongly corresponds with 400 mm isohyet 0 °C isotherm China. correlation analysis NEP positively correlated precipitation negatively temperature; is, mainly promotes accumulation NEP, temperature inhibits it. effect jointly affects change CGE. This study can provide scientific basis government departments formulate targeted policies deal climate change, great significance improve management, ensure ecological security promote realization China’s goal.