Yang Da, Yi Gui-Hua, Zhang Ting-Bin, Li Jing-Ji, Qin Yan-Bin, Wen Bo, Liu Zhi-Yu
College of Earth Science, Chengdu University of Technology, Chengdu 610059, China.
College of Tourism and Urban-Rural Planning, Chengdu University of Technology, Chengdu 610059, China.
Ying Yong Sheng Tai Xue Bao. 2021 Apr;32(4):1361-1372. doi: 10.13287/j.1001-9332.202104.014.
It is important to understand the response of vegetation to climate change in Tibetan Pla-teau (TP), an ecological barrier for China and Asia. The spatiotemporal variation of the normalized difference vegetation index (NDVI) of vegetation growing season were analyzed based on the gro-wing season NDVI retrieved from MOD09A1. The relationship between NDVI and climate factors was analyzed by combining the data of meteorological stations in TP from 2001 to 2018. The results showed that NDVI in the growing season showed a slow upward trend during the study period. There was substantial interannual variation of NDVI in different climate regions. The fluctuation magnitude of NDVI value was plateau humid climate region>semi-humid climate region>semi-arid climate region>arid climate region. The proportion of area with increasing and decreasing NDVI in humid climate region, semi-humid climate region, arid climate region, semi-arid climate region on TP were 1.4% and 1.9%, 4.9% and 1.5%, 16.4% and 0.8%, 7.0% and 2.0%, respectively. The areas of increasing NDVI in arid and semi-arid climate region was significantly larger than humid and semi-humid region. Temperature was the leading factor affecting the change of NDVI in humid and semi-humid region. The impact of precipitation on NDVI was significantly stronger than that of other climate factors in arid region. The impact of air temperature in growing season on NDVI was stronger than that of precipitation and relative humidity.
了解青藏高原（TP）植被对气候变化的响应至关重要，青藏高原是中国和亚洲的生态屏障。基于从MOD09A1反演得到的生长季归一化植被指数（NDVI），分析了植被生长季NDVI的时空变化。结合2001年至2018年青藏高原气象站的数据，分析了NDVI与气候因子之间的关系。结果表明，在研究期间，生长季NDVI呈缓慢上升趋势。不同气候区域的NDVI存在显著的年际变化。NDVI值的波动幅度为高原湿润气候区>半湿润气候区>半干旱气候区>干旱气候区。青藏高原湿润气候区、半湿润气候区、干旱气候区、半干旱气候区NDVI增加和减少的面积比例分别为1.4%和1.9%、4.9%和1.5%、16.4%和0.8%、7.0%和2.0%。干旱和半干旱气候区NDVI增加的面积显著大于湿润和半湿润地区。温度是影响湿润和半湿润地区NDVI变化的主导因素。在干旱地区，降水对NDVI的影响明显强于其他气候因子。生长季气温对NDVI的影响强于降水和相对湿度。
