期刊
STOCHASTIC ENVIRONMENTAL RESEARCH AND RISK ASSESSMENT
卷 32, 期 8, 页码 2423-2432出版社
SPRINGER
DOI: 10.1007/s00477-017-1492-y
关键词
Drought; Vegetation response; Time-lag effect; Enhanced vegetation index (EVI); South China
类别
资金
- National Natural Science Foundation of China [51679233]
- National Science Foundation of Guangdong Province [2016A050503035]
- General Research Fund (GRF) Project from the Research Grants Council of Hong Kong [HKU 710712E]
- Australian Research Council (ARC) through the Future Fellowship grant [FT110100328]
The time-lag effects of droughts on vegetation responses vary significantly across a large-scale river basin. The spatio-temporal response characteristics obtained are important for decision making processes on the allocation and transportation of regional water resources in mitigating drought impacts. Here we consider the Xijiang (West River) basin in South China as a case study, which has experienced severe drought events since the beginning of the 21st century. A threshold level approach is employed to identify the major drought events over the basin in the first decade of this century. The vegetation responses to land soil water evolution are examined, particularly for the severe drought events occurred. The time-lag effects of the vegetation responses within the basin range within 0-96 days. The lower reaches of the headwater sub-basins in the west part of the Xijiang basin are identified as the regions with short time-lag effects. The enhanced vegetation index (EVI) shows consistent responses to the soil water evolution in conjunction with the climate aridity in this area, which is the drought-vulnerable area in the Xijiang basin.
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