Global Critical Drought Thresholds of Terrestrial Carbon Sink-Source Transition
文献类型：期刊论文
| 作者 | Guo, Wenwen8; Huang, Shengzhi7,8; Liu, Laibao6; Leng, Guoyong5; Huang, Qiang8; Chen, Deliang4; Li, Jianfeng3; Li, Pei8; Wang, Yiting8; Zhu, Xueying8 |
| 刊名 | GLOBAL CHANGE BIOLOGY
 |
| 出版日期 | 2025-03-01 |
| 卷号 | 31期号:3页码:e70129 |
| 关键词 | carbon sink source drought dynamic vegetation models net ecosystem productivity transition threshold |
| ISSN号 | 1354-1013 |
| DOI | 10.1111/gcb.70129 |
| 产权排序 | 4 |
| 文献子类 | Article |
| 英文摘要 | Drought is considered a major contributor to carbon sink fluctuations in terrestrial ecosystems and is expected to lead to more frequent carbon sink-source transitions under future climate change. The drought threshold for carbon sink-source transition reflects the critical inflection point at which the carbon sequestration capacity of vegetation is affected by water deficit. However, the spatiotemporal patterns of the global drought threshold and their underlying mechanisms remain poorly understood. Here, we use three independent datasets from vegetation dynamics models, inversion modeling, and observational data to map and explore the drought thresholds expressed by the standardized precipitation evapotranspiration index (SPEI) during the growing season over the past four decades. Sink-source transition is indicated by changes of sign for net ecosystem productivity (NEP). The drought thresholds were identified across 66.3% of global land, with an average threshold of -1.08 +/- 0.68. Regions with lower thresholds are primarily located in the Northern Hemisphere at middle and high latitudes, whereas Australia, Africa, western South America, and southern North America exhibit higher thresholds. The dominant factor influencing the spatial pattern of drought thresholds is potential evapotranspiration. Our dynamic results show that 36.4% of the thresholds increased, while 55.8% decreased. We found that disproportionate decreases in photosynthesis and respiration caused by drought in South America led to decreased thresholds and increased drought resilience in this region. Under conditions of reduced soil moisture, lower radiation, increased vapor pressure deficit, and enhanced heatwave intensity, drought in North America had a greater effect on reducing photosynthesis than it did on respiration. This resulted in an increasing threshold trend, where even relatively low levels of drought can induce a carbon sink-source transition. In addition, CO2 fertilization plays a major role in reducing thresholds and mitigating climate change. Our findings emphasize that the risk of carbon sink-source transition is more acute in regions with rising thresholds. This implies that the stability of ecosystem carbon sequestration in these regions may decrease under persistent water stress. |
| URL标识 | 查看原文 |
| WOS关键词 | CLIMATE EXTREMES ; CO2 ; PRODUCTIVITY ; DYNAMICS ; IMPACTS ; DRIVEN ; FLUXES ; CYCLE ; HEAT |
| WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
| 语种 | 英语 |
| WOS记录号 | WOS:001444753700001 |
| 出版者 | WILEY |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/213287]  |
| 专题 | 陆地水循环及地表过程院重点实验室_外文论文 |
| 通讯作者 | Huang, Shengzhi |
| 作者单位 | 1.Univ Leipzig, Remote Sensing Ctr Earth Syst Res, Leipzig, Germany 2.UFZ Helmholtz Ctr Environm Res, Dept Remote Sensing, Leipzig, Germany; 3.Hong Kong Baptist Univ, Dept Geog, Kowloon Tong, Hong Kong, Peoples R China; 4.Tsinghua Univ, Dept Earth Syst Sci, Beijing, Peoples R China; 5.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing, Peoples R China; 6.Univ Hong Kong, Dept Geog, Hong Kong, Peoples R China; 7.North China Univ Water Resources & Elect Power, Sch Water Conservancy, Zhengzhou, Peoples R China; 8.Xian Univ Technol, State Key Lab Ecohydraul Northwest Arid Reg China, Xian, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Guo, Wenwen,Huang, Shengzhi,Liu, Laibao,et al. Global Critical Drought Thresholds of Terrestrial Carbon Sink-Source Transition[J]. GLOBAL CHANGE BIOLOGY,2025,31(3):e70129. |
| APA | Guo, Wenwen.,Huang, Shengzhi.,Liu, Laibao.,Leng, Guoyong.,Huang, Qiang.,...&Peng, Jian.(2025).Global Critical Drought Thresholds of Terrestrial Carbon Sink-Source Transition.GLOBAL CHANGE BIOLOGY,31(3),e70129. |
| MLA | Guo, Wenwen,et al."Global Critical Drought Thresholds of Terrestrial Carbon Sink-Source Transition".GLOBAL CHANGE BIOLOGY 31.3(2025):e70129. |
入库方式： OAI收割
来源：地理科学与资源研究所
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