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Dynamics and Drivers of the Alpine Timberline on Gongga Mountain of Tibetan Plateau-Adopted from the Otsu Method on Google Earth Engine

文献类型：期刊论文

作者He, Wen1,2; Ye, Chongchong1,2; Sun, Jian1; Xiong, Junnan2; Wang, Jinniu3; Zhou, Tiancai1
刊名REMOTE SENSING
出版日期2020-08-01
卷号12期号:16页码:20
关键词alpine timberline timberline dynamics Otsu method Google Earth engine Gongga Mountain
DOI10.3390/rs12162651
通讯作者Sun, Jian(sunjian@igsnrr.ac.cn)
英文摘要The alpine timberline, an ecosystem ecotone, indicates climatic change and is tending to shift toward higher altitudes because of an increase in global warming. However, spatiotemporal variations of the alpine timberline are not consistent on a global scale. The abundant and highest alpine timberline, located on the Tibetan Plateau, is less subject to human activity and disturbance. Although many studies have investigated the alpine timberline on the Tibetan Plateau, large-scale monitoring of spatial-temporal dynamics and driving mechanisms of the alpine timberline remain uncertain and inaccurate. Hence, the Gongga Mountain on the southeastern Tibetan Plateau was chosen as the study area because of the most complete natural altitudinal zonation. We used the Otsu method on Google Earth Engine to extract the alpine timberline from 1987-2019 based on the normalized difference vegetation index (NDVI). Then, the alpine timberline spatiotemporal patterns and the effect of topography on alpine timberline distribution were explored. Four hillsides on the western Gongga Mountain were selected to examine the hillside differences and drivers of the alpine timberline based on principal component analysis (PCA) and multiple linear regression (MLR). The results indicated that the elevation range of alpine timberline was 3203-4889 m, and the vegetation coverage increased significantly (p< 0.01) near the alpine timberline ecotone on Gongga Mountain. Moreover, there was spatial heterogeneity in dynamics of alpine timberline, and some regions showed no regular trend in variations. The spatial pattern of the alpine timberline was generally high in the west, low in the east, and primarily distributed on 15-55 degrees slopes. Besides, the drivers of the alpine timberline have the hillside differences, and the sunny and shady slopes possessed different driving factors. Thus, our results highlight the effects of topography and climate on the alpine timberline on different hillsides. These findings could provide a better approach to study the dynamics and formation of alpine timberlines.
WOS关键词TREE-LINE ; VEGETATION ACTIVITY ; CLIMATE-CHANGE ; ECOTONE ; FOREST ; VARIABILITY ; TREELINES ; ALTITUDE ; GROWTH ; ECOSYSTEMS
资助项目Second Tibetan Plateau Scientific Expedition and Research[2019QZKK0405] ; National Science Foundation of China[41661144045] ; National Science Foundation of China[31971436] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA20030302] ; Science and Technology Project of Xizang Autonomous Region[XZ201901-GA-07]
WOS研究方向Remote Sensing
语种英语
WOS记录号WOS:000565440500001
出版者MDPI
资助机构Second Tibetan Plateau Scientific Expedition and Research ; National Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Science and Technology Project of Xizang Autonomous Region
源URL[http://ir.igsnrr.ac.cn/handle/311030/157940]  
专题中国科学院地理科学与资源研究所
通讯作者Sun, Jian
作者单位1.Chinese Acad Sci, Synth Res Ctr Chinese Ecosyst Res Network, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modelling, Beijing 100101, Peoples R China
2.Southwest Petr Univ, Sch Civil Engn & Geomat, Chengdu 610500, Peoples R China
3.Chinese Acad Sci, Chengdu Inst Biol, Chengdu 610041, Peoples R China
推荐引用方式
GB/T 7714		 He, Wen,Ye, Chongchong,Sun, Jian,et al. Dynamics and Drivers of the Alpine Timberline on Gongga Mountain of Tibetan Plateau-Adopted from the Otsu Method on Google Earth Engine[J]. REMOTE SENSING,2020,12(16):20.
APA He, Wen,Ye, Chongchong,Sun, Jian,Xiong, Junnan,Wang, Jinniu,&Zhou, Tiancai.(2020).Dynamics and Drivers of the Alpine Timberline on Gongga Mountain of Tibetan Plateau-Adopted from the Otsu Method on Google Earth Engine.REMOTE SENSING,12(16),20.
MLA He, Wen,et al."Dynamics and Drivers of the Alpine Timberline on Gongga Mountain of Tibetan Plateau-Adopted from the Otsu Method on Google Earth Engine".REMOTE SENSING 12.16(2020):20.

入库方式： OAI收割

来源：地理科学与资源研究所

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