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Different Influences of Vegetation Greening on Regional Water-Energy Balance under Different Climatic Conditions
Zhang, Dan1; Liu, Xiaomang2; Bai, Peng2
2018-07-01
Source PublicationFORESTS
ISSN1999-4907
Volume9Issue:7Pages:15
Corresponding AuthorLiu, Xiaomang(hydroliu@163.com)
AbstractVegetation serves as a key element in the land-atmospheric system, and changes in vegetation can impact the regional water-energy balance via several biophysical processes. This study proposes a new water-energy balance index that estimates the available-water-to-available-energy ratio (WER) by improving upon the Budyko framework, which evaluates climate variation and vegetation change. Moreover, the impact of vegetation greening on WER is quantified in 34 catchments under different climatic conditions. The results show that the normalized difference vegetation index (NDVI) increased at all the catchments, which indicates that there was a vegetation greening trend in the study area. There are negative relationships between the NDVI and runoff at both water-limited and energy-limited catchments, which demonstrates that both types of catchments became drier due to vegetation greening. Four numerical experiments were executed to quantify the contribution of vegetation greening and climate variations to WER changes. The results show that the calculated WER trends by numerical tests fit well with the observed WER trends (R-2 = 0.96). Vegetation greening has positive influences on WER changes under energy-limited conditions, which indicates that residual energy decreases faster than water availability, resulting in less energy for sensible heat, i.e., a cooling effect. Nevertheless, vegetation greening has negative influences on WER under water-limited conditions, which indicates that water availability decreases faster than residual energy, resulting in more energy for sensible heat. Notably, the WER decrease in water-limited catchments is dominated by potential evapotranspiration and NDVI variation, whereas the WER change in energy-limited catchments is dominated by climate variation. This study provides a comprehensive understanding of the relationships among water, energy and vegetation greening under different climatic conditions, which is important for land-atmosphere-vegetation modeling and designing strategies for ecological conservation and local water resource management.
Keywordvegetation greening water-energy balance quantification different climatic conditions
DOI10.3390/f9070412
WOS KeywordAVHRR-NDVI DATA ; RIVER-BASIN ; LAND-USE ; CHINA ; MODEL ; EVAPOTRANSPIRATION ; EVAPORATION ; FOREST ; STREAMFLOW ; RESOLUTION
Indexed BySCI
Language英语
Funding ProjectNatural Science Foundation of China[41771039] ; Natural Science Foundation of China[41330529] ; Natural Science Foundation of China[41571023] ; Youth Innovation Promotion Association, CAS[2018067]
Funding OrganizationNatural Science Foundation of China ; Youth Innovation Promotion Association, CAS
WOS Research AreaForestry
WOS SubjectForestry
WOS IDWOS:000440018600043
PublisherMDPI
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/54514
Collection中国科学院地理科学与资源研究所
Corresponding AuthorLiu, Xiaomang
Affiliation1.Chinese Acad Sci, Nanjing Inst Geog & Limnol, Key Lab Watershed Geog Sci, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100011, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Dan,Liu, Xiaomang,Bai, Peng. Different Influences of Vegetation Greening on Regional Water-Energy Balance under Different Climatic Conditions[J]. FORESTS,2018,9(7):15.
APA Zhang, Dan,Liu, Xiaomang,&Bai, Peng.(2018).Different Influences of Vegetation Greening on Regional Water-Energy Balance under Different Climatic Conditions.FORESTS,9(7),15.
MLA Zhang, Dan,et al."Different Influences of Vegetation Greening on Regional Water-Energy Balance under Different Climatic Conditions".FORESTS 9.7(2018):15.
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