Chen Bin, Xu Xiyan, Wang Shaoqiang, Yang Te, Liu Zhenhai, Falk Stefanie
Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China.
Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China.
Sci Total Environ. 2024 Dec 10;955:176903. doi: 10.1016/j.scitotenv.2024.176903. Epub 2024 Oct 13.
The Amazon, the Earth's largest tropical forest, plays a critical role in the global carbon cycle, acting as a significant carbon sink. Recent studies, however, indicate a decline in its carbon sequestration capacity due to climate variability, intensive deforestation, and fires. This study aims to examine the impacts of these factors on the carbon dynamics of the Amazon over a centennial scale based on dynamic global vegetation models (DGVMs) of Trendy-v11. It was found that the Amazon region exhibited significant spatiotemporal variations in net land carbon (C) fluxes, and was a net C sink (40.02 ± 242.64 Tg C yr) during 1901-2021. The Amazonian net biome productivity (NBP) showed a 6-decades-scale shift from a decreasing trend (-3.78 Tg C yr) during 1901-1959 to an increasing trend (2.39 Tg C yr) during 1960-2021. The Amazonian NBP was negatively related to air temperature while positively related to dry-season precipitation during 1901-2021. Furthermore, the increase of atmospheric CO concentration during 1901-2020 enhanced Amazonian NBP by 36.40 ± 8.39 Pg C, which was largely offset by land use change (-18.84 ± 12.02 Pg C) and climate change (-10.03 ± 5.00 Pg C). Our findings underscore the critical need for sustainable management practices in the Amazon to enhance its C sink and preserve its function in the global climate system.
亚马逊雨林是地球上最大的热带森林，在全球碳循环中发挥着关键作用，是一个重要的碳汇。然而，最近的研究表明，由于气候变率、高强度森林砍伐和火灾，其碳固存能力正在下降。本研究旨在基于Trendy-v11的动态全球植被模型（DGVMs），在百年尺度上研究这些因素对亚马逊雨林碳动态的影响。研究发现，亚马逊地区的陆地净碳（C）通量存在显著的时空变化，在1901-2021年期间是一个净碳汇（40.02±242.64 Tg C/年）。亚马逊地区的净生物群系生产力（NBP）呈现出六十年尺度的转变，从1901-1959年期间的下降趋势（-3.78 Tg C/年）转变为1960-2021年期间的上升趋势（2.39 Tg C/年）。在1901-2021年期间，亚马逊地区的NBP与气温呈负相关，与旱季降水量呈正相关。此外，1901-2020年期间大气CO₂浓度的增加使亚马逊地区的NBP增加了36.40±8.39 Pg C，但这在很大程度上被土地利用变化（-18.84±12.02 Pg C）和气候变化（-10.03±5.00 Pg C）所抵消。我们的研究结果强调了在亚马逊地区实施可持续管理措施的迫切需求，以增强其碳汇能力，并保护其在全球气候系统中的功能。
