Research Data

Vegetation carbon storage plays a vital role in terrestrial ecosystems and is subject to a combination of climate change and anthropogenic activities. Quantifying the relative contributions of regional climate change and human activities to vegetation carbon is essential to achieve carbon neutrality and address global climate change. This study employs multiple analytical techniques to comprehensively analyze the changes in net primary productivity and net ecosystem productivity in the Sichuan-Chongqing region and their influencing factors Theil Sen Median and Mann Kendall tests, partial correlation analysis, multiple correlation analysis, and land use and cover change (LUCC) matrices. The relative contributions of human activities and climate change to NPP are examined using a two-step linear regression method. The results showed that from 2001 to 2022, both NPP and NEP in the Sichuan-Chongqing region increased significantly, with both climate change and human activities having a positive impact on vegetation growth. The contributions of climate change and human activities to NPP are 3.14 gC m^-2 a^-1 (82.41%) and 0.67 gC m^-2 a^-1 (17.59%), respectively. Furthermore, precipitation, temperature, solar radiation, and other climate factors contributed an average of 2.20, 0.01, -0.19, and 1.12 gC m^-2 a^-1 to NPP in the Sichuan-Chongqing region. Precipitation is the main climate factor affecting NPP in the Sichuan basin and its surrounding areas, while temperature is the dominant factor influencing NPP in the northwestern Sichuan alpine plateau. From 2001 to 2022, Sichuan-Chongqing region led to an increase of 9338.14 Gg C in vegetation NEP, with the largest increase in NEP resulting from the conversion of cropland to forest land. From 2001 to 2022, the ecosystem in the Sichuan-Chongqing region served as a carbon sink, with an enhanced carbon sink function, influenced jointly by climate change and land use change.