ANALYZING THE VELOCITY OF VEGETATION PHENOLOGY OVER THE TIBETAN PLATEAU USING GIMMS NDVI3g DATA

International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences

Zhou, Y. K.^1¹ 

[1] Key Laboratory of Ecosystem Network Observation and Modelling, IGSNRR, CAS, 100101 Beijing, China^1

关键词: Vegetation Phenology;    Velocity;    GIMMS NDVI;    Tibetan Plateau;    Climate Change;   

DOI  :  10.5194/isprs-archives-XLII-3-2575-2018

学科分类：地球科学(综合)

来源: Copernicus Publications

【 摘 要 】

Global environmental change is rapidly altering the dynamics of terrestrial vegetation, and phenology is a classic proxy to detect the response of vegetation to the changes. On the Tibetan Plateau, the earlier spring and delayed autumn vegetation phenology is widely reported. Remotely sensed NDVI can serve as a good data source for vegetation phenology study. Here GIMMS NDVI3g data was used to detect vegetation phenology status on the Tibetan Plateau. The spatial and temporal gradients are combined to depict the velocity of vegetation expanding process. This velocity index represents the instantaneous local velocity along the Earth’s surface needed to maintain constant vegetation condition. This study found that NDVI velocity show a complex spatial pattern. A considerable number of regions display a later starting of growing season (SOS) and earlier end of growing season (EOS) reflected by the velocity change, particularly in the central part of the plateau. Nearly 74 % vegetation experienced a shortened growing season length. Totally, the magnitude of the phenology velocity is at a small level that reveals there is not a significant variation of vegetation phenology under the climate change context.

【 授权许可】

CC BY