Different Satellite Products Revealing Variable Trends in Global Gross Primary Production

Abstract

Climate change threatens the survival of humanity on Earth, and achieving net-zero carbon dioxide (CO 2 ) emissions (carbon neutrality) in the second half of this century could mitigate the extreme damage of climate change (Chen, 2021). Plant photosynthesis is an important biochemical process in the terrestrial ecosystem; it regulates gas exchange between the atmosphere and the biosphere and plays a key role in the global carbon balance

Spatiotemporal Evolution and Impact Mechanisms of Gross Primary Productivity in Tropics

“…Overall, the regions with increasing trends in GPP in the tropics are mostly north of the equator, and the regions with decreasing trends are mostly south of the equator. Among them, the change in GPP in the Australian region is not significant, while the Southeast Asian region primarily exhibits a decreasing trend, which is somewhat consistent with existing studies [18,19].…”

“…Bai et al showed that in arid and tropical regions [19], vegetation productivity is usually limited by water availability. In contrast, high temperatures extend the length of the growing season, thereby increasing vegetation productivity.…”

“…Overall, the regions with increasing trends of GPP in the tropics are mainly north of the equator, while the regions with decreasing trends are mainly south of the equator. Among these regions, the change in GPP in the Australian region is not significant, while the Southeast Asian region shows predominantly a decreasing trend [18,19]. (2) To investigate the mechanisms underlying GPP, factors such as the CO 2 fertilization effect [20,21], climate change [14,22], nitrogen deposition [23], and land cover change [11,24,25] have been shown to positively influence the increase in GPP.…”