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| DOI | 10.1016/j.scitotenv.2024.170482 |
| Dominance of soil moisture over aridity in explaining vegetation greenness across global drylands | |
| 发表日期 | 2024 |
| ISSN | 0048-9697 |
| EISSN | 1879-1026 |
| 起始页码 | 917 |
| 卷号 | 917 |
| 英文摘要 | Drylands are one of the most sensitive areas to climate change. Despite being characterized by water scarcity and low precipitation, drylands support a wide range of green biodiversity and nearly 40 % of the global population. However, the climate change impacts on dryland characteristics and vegetation dynamics are debatable as the reasons remain poorly understood. Here, we use hydro-meteorological variables from ERA5 reanalysis and GIMMS-NDVI to analyze the changes in dryland aridity and vegetation greenness in the eight selected global dryland regions. The total dryland area (excluding hyperarid) has increased by 12 %, while arid, semiarid, and dry sub-humid areas have increased by 10.5 %, 8 %, and 25 %, respectively. We find a significant increase in aridity in drylands across the globe, except for South Asia. A decrease (increase) in precipitation is the major driver for a significant increase (decrease) in dryland aridity, with a notable contribution from climate warming. Despite decreasing trends in precipitation, vegetation greenness has significantly increased in most dryland regions due to increased soil moisture. Cropland expansion in Europe, Asia, and Australia resulted in the maximum increase in NDVI (Normalized Difference Vegetation Index) in dryland regions. The highest increase, with a Delta NDVI of 0.075, was observed in South Asia. The enhanced vegetation greenness observed is attributed to the expansion of croplands in recent decades, which has increased soil moisture. Overall, we show that monitoring soil moisture variability can provide a more robust explanation for vegetation greenness in the global drylands than aridity change. Moreover, human interventions of climatic alteration through land use change practices, such as cropland expansion, cannot be ignored while explaining the ecosystem dynamics of the drylands. |
| 英文关键词 | Dryland area; Climate change; Vegetation greenness; Aridity; Soil moisture; Cropland expansion |
| 语种 | 英语 |
| WOS研究方向 | Environmental Sciences & Ecology |
| WOS类目 | Environmental Sciences |
| WOS记录号 | WOS:001178032000001 |
| 来源期刊 | SCIENCE OF THE TOTAL ENVIRONMENT
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| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/308524 |
| 作者单位 | Indian Institute of Technology System (IIT System); Indian Institute of Technology (IIT) - Gandhinagar; State University System of Florida; Florida Atlantic University; Michigan State University; Indian Institute of Technology System (IIT System); Indian Institute of Technology (IIT) - Gandhinagar; Indian Institute of Technology System (IIT System); Indian Institute of Technology (IIT) - Gandhinagar |
| 推荐引用方式 GB/T 7714 | . Dominance of soil moisture over aridity in explaining vegetation greenness across global drylands[J],2024,917. |
| APA | (2024).Dominance of soil moisture over aridity in explaining vegetation greenness across global drylands.SCIENCE OF THE TOTAL ENVIRONMENT,917. |
| MLA | "Dominance of soil moisture over aridity in explaining vegetation greenness across global drylands".SCIENCE OF THE TOTAL ENVIRONMENT 917(2024). |
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