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Temporal and Spatial Variations in the Leaf Area Index and Its Response to Topography in the Three-River Source Region, China from 2000 to 2017
Zhang, Wenqi1,2; Jin, Huaan2; Shao, Huaiyong1; Li, Ainong2; Li, Shangzhi3,4; Fan, Wenjie1
Corresponding AuthorJin, Huaan(jinhuaan@imde.ac.cn)
2021
Source PublicationISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION
EISSN2220-9964
Volume10Issue:1Pages:Article
SubtypeArticle
Contribution Rank2
AbstractThe Three-River Source Region (TRSR) is an important area for the ecological security of China. Vegetation growth has been affected by the climate change, topography, and human activities in this area. However, few studies have focused on analyzing time series tendencies of vegetation change in various terrain conditions. To address this issue in the TRSR, this study explored vegetation stability, tendency, and sustainability with multiple methods (e.g., coefficient of variation, Theil-Sen median trend analysis, Mann-Kendall test, and Hurst index) based on the 2000-2017 Global LAnd Surface Satellite Leaf Area Index (GLASS LAI) product. The differentiation patterns of LAI variations and multiyear mean LAI value under different topographic factors were also investigated in combination with digital elevation model (DEM). The results showed that (1) the mean LAI value in the study area increased, with a linear tendency of 0.013 center dot 10 a(-1); (2) LAI values decreased from southeast to northwest in terms of spatial distribution and the CV indicated LAI variations were relatively stable; (3) the trend analysis revealed that the improved area of LAI accounted for 62.72% which was larger than the degraded area (37.28%), and hurst index revealed a weak anti-sustaining effect of the current tendencies; and (4) the increasing trend was found in multiyear mean LAI value as relief amplitude and slope increased, while LAI stability improved with increasing slope. They exhibited a clear regular pattern. Moreover, significant improvement in LAI generally occurred in low-altitude and flat areas. Finally, the overall improvement and sustainability of LAI improved when moving from sunny aspects to shady aspects, but the LAI stability decreased. Note that vegetation degradation was observed in some high slope areas and was further aggravated. This study is beneficial for revealing the spatial and temporal changes of LAI and their changing rules as a function of different topographic factors in the TRSR. Meanwhile, the results of this study provide theoretical support for sustainable development of this area.
KeywordThree-River Source Region leaf area index vegetation changes topographic effect
DOI10.3390/ijgi10010033
Indexed BySCI
Language英语
Funding ProjectNational Key Research and Development Program of China[2016YFA0600103] ; National Natural Science Foundation of China[41671376] ; National Natural Science Foundation of China[42071352] ; National Natural Science Foundation of China[41801370] ; Sichuan Science and Technology Program[2019YJ0007]
WOS Research AreaPhysical Geography ; Remote Sensing
WOS SubjectGeography, Physical ; Remote Sensing
WOS IDWOS:000610282200001
Funding OrganizationNational Key Research and Development Program of China ; National Natural Science Foundation of China ; Sichuan Science and Technology Program
PublisherMDPI
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/55256
Collection数字山地与遥感应用中心
Corresponding AuthorJin, Huaan
Affiliation1.Chengdu Univ Technol, Coll Earth Sci, Chengdu 610059, Peoples R China
2.Chinese Acad Sci, Inst Mt Hazards & Environm, Res Ctr Digital Mt & Remote Sensing Applicat, Chengdu 610041, Peoples R China
3.Henan Polytech Univ, Sch Surveying & Land Informat Engn, Jiaozuo 454000, Henan, Peoples R China
4.Henan Univ, Minist Educ, Key Lab Geospatial Technol Middle & Lower Yellow, Kaifeng 475004, Peoples R China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Corresponding Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Zhang, Wenqi,Jin, Huaan,Shao, Huaiyong,et al. Temporal and Spatial Variations in the Leaf Area Index and Its Response to Topography in the Three-River Source Region, China from 2000 to 2017[J]. ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION,2021,10(1):Article.
APA Zhang, Wenqi,Jin, Huaan,Shao, Huaiyong,Li, Ainong,Li, Shangzhi,&Fan, Wenjie.(2021).Temporal and Spatial Variations in the Leaf Area Index and Its Response to Topography in the Three-River Source Region, China from 2000 to 2017.ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION,10(1),Article.
MLA Zhang, Wenqi,et al."Temporal and Spatial Variations in the Leaf Area Index and Its Response to Topography in the Three-River Source Region, China from 2000 to 2017".ISPRS INTERNATIONAL JOURNAL OF GEO-INFORMATION 10.1(2021):Article.
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