Inconsistent increasing of climate potential productivity resulting from global warming and land use transitions in the Dongting Lake Basin, from 2000 to 2020

In the face of global warming and increasing impervious surfaces, quantifying the change of climate potential productivity (CPP) is of great significance for the food production planning. Targeting the Dongting Lake Basin, which is a key area for food production in China, this paper uses meteorological data, as well as Climate Change Initiative Land Cover, and Shuttle Radar Topography Mission digital elevation model to investigate the CPP and its changes from 2000 to 2020. The suitability of land for cultivation (SLC), and the land use/land cover change (LUCC) are also considered. The results showed that the CPP varied from 9,825 to 20,895 kg ha(-1). Even though the newly added impervious surfaces indirectly resulted in the decrease of CPP by of 9.81x10(8) kg, overall, the CPP increased at an average rate of 83.7 kg ha(-1) a(-1). Global warming is the strongest driver behind CPP increase, and CPP has played an important role in the conversions between cultivated land and other land types. The structure of land types tends to be optimized against this challenge.