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Detecting the Turning Points of Grassland Autumn Phenology on the Qinghai-Tibetan Plateau: Spatial Heterogeneity and Controls
Yang, Yanzheng; Qi, Ning; Zhao, Jun; Meng, Nan; Lu, Zijian; Wang, Xuezhi; Kang, Le; Wang, Boheng; Li, Ruonan; Ma, Jinfeng; Zheng, Hua
2021
Source PublicationREMOTE SENSING
Volume13Issue:23Pages:4797
AbstractAutumn phenology, commonly represented by the end of season (EOS), is considered to be the most sensitive and crucial productivity indicator of alpine and cold grassland in the Qinghai-Tibetan Plateau. Previous studies typically assumed that the rates of EOS changes remain unchanged over long time periods. However, pixel-scale analysis indicates the existence of turning points and differing EOS change rates before and after these points. The spatial heterogeneity and controls of these turning points remain unclear. In this study, the EOS turning point changes are extracted and their controls are explored by integrating long time-series remote sensing images and piecewise regression methods. The results indicate that the EOS changed over time with a delay rate of 0.08 days/year during 1982-2015. The rates of change are not consistent over different time periods, which clearly highlights the existence of turning points. The results show that temperature contributed most strongly to the EOS changes, followed by precipitation and insolation. Furthermore, the turning points of climate, human activities (e.g., grazing, economic development), and their intersections are found to jointly control the EOS turning points. This study is the first quantitative investigation into the spatial heterogeneity and controls of the EOS turning points on the Qinghai-Tibetan Plateau, and provides important insight into the growth mechanism of alpine and cold grassland.
Department城市与区域生态国家重点实验室
Keywordautumn phenology turning point climate changes human activities Qinghai-Tibetan Plateau
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/46930
Collection城市与区域生态国家重点实验室
Affiliation1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China
2.Beijing Forestry Univ, Sch Informat Sci & Technol, Beijing 100083, Peoples R China
3.China Aero Geophys Survey & Remote Sensing Ctr Na, Beijing 100083, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Shanghai Normal Univ, Sch Environm & Geog Sci, Shanghai 200234, Peoples R China
6.Chinese Acad Sci, Comp Network Informat Ctr, Beijing 100083, Peoples R China
7.East China Inventory & Planning Inst State Adm Fo, Hangzhou 310019, Peoples R China
Recommended Citation
GB/T 7714
Yang, Yanzheng,Qi, Ning,Zhao, Jun,et al. Detecting the Turning Points of Grassland Autumn Phenology on the Qinghai-Tibetan Plateau: Spatial Heterogeneity and Controls[J]. REMOTE SENSING,2021,13(23):4797.
APA Yang, Yanzheng.,Qi, Ning.,Zhao, Jun.,Meng, Nan.,Lu, Zijian.,...&Zheng, Hua.(2021).Detecting the Turning Points of Grassland Autumn Phenology on the Qinghai-Tibetan Plateau: Spatial Heterogeneity and Controls.REMOTE SENSING,13(23),4797.
MLA Yang, Yanzheng,et al."Detecting the Turning Points of Grassland Autumn Phenology on the Qinghai-Tibetan Plateau: Spatial Heterogeneity and Controls".REMOTE SENSING 13.23(2021):4797.
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