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题名: Increased Vegetation Greenness Aggravates Water Conflicts during Lasting and Intensifying Drought in the Poyang Lake Watershed, China
作者: Tang, Lin-Ling1; Cai, Xiao-Bin2, 3, 4; Gong, Wei-Shu5; Lu, Jian-Zhong1; Chen, Xiao-Ling1, 6; Lei, Qian7; Yu, Gong-Liang8
关键词: vegetation greenness ; water yield ; growing-season drought ; Poyang Lake watershed ; Water Supply Stress Index
刊名: FORESTS
发表日期: 2018
DOI: 10.3390/f9010024
卷: 9, 期:1
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
类目[WOS]: Forestry
研究领域[WOS]: Forestry
英文摘要: An increase in vegetation greenness can improve ecosystem productivity, but also reduce the water supply, creating the potential for conflicting water demands between ecosystems and humans. This problem has been well-assessed and is most evident in dry environments. However, in humid regions, the potential effects of vegetation greenness on water yields under drought conditions are not well understood. To address this gap, we focused on the Poyang Lake watershed in the humid region of southern China. Based on the Standardized Precipitation Evapotranspiration Index and a satellite-derived leaf area index dataset during the growing seasons of 1984 to 2013, several typical dry growing seasons were selected as the study conditions. An existing Water Supply Stress Index model was modified to investigate how the changes in vegetation greenness affected water yield and to explore potentially conflicting water demands between ecosystems and humans under drought conditions. Our results showed that an increase of 20-80% in vegetation greenness generally resulted in a reduction of 3-27% in water yield under drought conditions. Large reductions in water yield mainly were observed in forested areas due to large increases in forest greenness. Moreover, increased vegetation greenness caused a 2 to 3 times greater reduction in water yield during continuing and intensifying droughts than during a short moderate drought period. Thus, in this study, during continuing and intensifying droughts, increased vegetation greenness can cause or aggravate water conflicts in sub-watersheds with high forest cover and high human water demands. Therefore, given the increasing frequency of extreme climatic events, afforestation with a targeted approach should be implemented as it would provide the most benefits. In addition, selective harvesting in forested areas with high density could be an effective strategy to maintain water supply in humid regions.
关键词[WOS]: US NATIONAL FORESTS ; LOESS PLATEAU ; TERRESTRIAL ECOSYSTEMS ; CARBON SEQUESTRATION ; RIVER-BASIN ; RESTORATION ; IMPACTS ; CLIMATE ; YIELD ; EVAPOTRANSPIRATION
语种: 英语
项目资助者: Special Fund by Surveying & Mapping and Geoinformation Research in the Public Interest Grant(201512026) ; National Science Foundation of China(41331174) ; Collaborative Innovation Center for Major Ecological Security Issues of Jiangxi Province ; Monitoring Implementation Grant(JXS-EW-08)
WOS记录号: WOS:000424115000023
ISSN号: 1999-4907
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内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/50653
Appears in Collections:藻类生物学及应用研究中心_期刊论文

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作者单位: 1.Wuhan Univ, State Key Lab Informat Engn Surveying Mapping & R, Wuhan 430079, Hubei, Peoples R China
2.Chinese Acad Sci, Inst Geodesy & Geophys, Wuhan 430077, Hubei, Peoples R China
3.Key Lab Monitoring & Estimate Environm & Disaster, Wuhan 430077, Hubei, Peoples R China
4.State Key Lab Geodesy & Earths Dynam, Wuhan 430077, Hubei, Peoples R China
5.Univ Maryland, Dept Geog Sci, College Pk, MD 20742 USA
6.Jiangxi Normal Univ, Key Lab Poyang Lake Wetland & Watershed Res, Minist Educ, Nanchang 330022, Jiangxi, Peoples R China
7.Wuhan Univ, Sch Elect Informat, Wuhan 430072, Hubei, Peoples R China
8.Chinese Acad Sci, Inst Hydrobiol, Wuhan 430071, Hubei, Peoples R China
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