青藏高原植被覆盖变化及气候驱动因子分析

Analysis of vegetation cover change and climate driving factors on the Qinghai-Tibet plateau

利用青藏高原2001—2015年的MODIS归一化植被数据集、地表温度数据集和317个气象站的气温、降水量数据,分析了归一化植被指数(NDVI)与气温、降水量及地温的相关性,讨论了3种气候因子的联合驱动机制。结果表明,青藏高原植被覆盖呈由东向西、自南向北的递减状态,且总体上呈波动增长趋势;青藏高原植被覆盖与降水量、气温及地温均呈正相关,与气温相关性最强;青藏高原植被增长的首要驱动因子是热量,且降水量与热量对植被生长的驱动作用呈互补性。

MODIS product(NDVI and land surface temperature)and meteorological data(precipitation and temperature)from 317 stations of the Qinghai-Tibet plateau from 2001 to 2015 were used to study the correlation coefficient between NDVI and temperature,precipitation and land surface temperature,and the combined driving mechanism of three climatic factors was discussed.The results indicated that the vegetation decreased from east to west and from south to north,and the vegetation growth trend was positive on the Qinghai-Tibet plateau.The vegetation was positively correlated with precipitation,temperature and ground temperature.The vegeta⁃tion had the highest correlation coefficient with temperature on the Qinghai-Tibet plateau.The primary driving factor for vegetation growth is heat.Precipitation and heat play a complementary role in the growth of vegetation on the Qinghai-Tibet plateau.