Increased global vegetation gross primary productivity(GPP)over the past decades has led to an enhanced terrestrial carbon sink,an important factor in mitigating global warming.However,the global spatiotemporal evolut...Increased global vegetation gross primary productivity(GPP)over the past decades has led to an enhanced terrestrial carbon sink,an important factor in mitigating global warming.However,the global spatiotemporal evolution of GPP trends is still under debate,largely limiting our understanding of the sustainability in terrestrial carbon sink.Here in this study,based on a dozen of long-term global GPP datasets,we found that global GPP trends fell significantly from 0.43 PgC year^(−2) in 1982–1999 to 0.17 PgC year^(−2) in 2000–2016,a signal detected across>68%of the terrestrial surface.The decrease in GPP trends was more pronounced from satellite-based GPP datasets than from process-based models,which may result from a decline in the CO_(2) fertilization effect.This finding therefore indicates that the terrestrial carbon sink may become saturated in the future,and highlights the urgent need of stricter strategies for reducing carbon emissions to mitigate global warming.展开更多
基金financially supported by the National Key R&D Program of China(2022YFF0803100)the Fundamental Research Funds for the Central Universities(KJJQ2024002)+11 种基金the National Natural Science Foundation of China(32322064,32471675,42071050&32101340)the financial support from Jiangsu Provincial Natural Science Foundation for Dis tinguished Young Scholars(BK20220083)the Young Elite Scientists Sponsorship Program by China Association for Science and Technology(2021QNRC001)the Carbon Peak and Carbon Neutralization Key Science and technology Program of Suzhou(ST202228)funding from the Swedish National Space Agency(Dnr 95/16&F2022/497)Formas,and the Eu-Adid funded CASSECS projectsupport from the NASA SMAP(grant 80NSSC20K1805)NASA CCE(80NSSC21K1709)the financial support from the National Natural Science Foundation of China(41901266)the financial support from the Spanish Government grant PID2019-110521GB-I00the Fundación Ramón Areces grant ELEMENTAL-CLIMATEthe Catalan Government grant SGR 2017-1005
文摘Increased global vegetation gross primary productivity(GPP)over the past decades has led to an enhanced terrestrial carbon sink,an important factor in mitigating global warming.However,the global spatiotemporal evolution of GPP trends is still under debate,largely limiting our understanding of the sustainability in terrestrial carbon sink.Here in this study,based on a dozen of long-term global GPP datasets,we found that global GPP trends fell significantly from 0.43 PgC year^(−2) in 1982–1999 to 0.17 PgC year^(−2) in 2000–2016,a signal detected across>68%of the terrestrial surface.The decrease in GPP trends was more pronounced from satellite-based GPP datasets than from process-based models,which may result from a decline in the CO_(2) fertilization effect.This finding therefore indicates that the terrestrial carbon sink may become saturated in the future,and highlights the urgent need of stricter strategies for reducing carbon emissions to mitigate global warming.
