2003～2014年关中地区季节植被覆盖度时空变化分析

Spatio-temporal Change Analysis of Seasonal Vegetation Coverage in Guanzhong Area from 2003 to 2014

利用MODIS植被指数(NDVI)和降雨时间序列数据,对关中地区2003~2014年季节植被覆盖度的空间格局和变化趋势进行了分析,并研究了其与标准化降水指数(SPI)的相关性。结果表明,(1)关中地区四季植被覆盖度中,I-15区全年最高,I-11区春季最高,I-12区夏季最高;(2)关中地区春、夏、冬季植被覆盖度有微小增长,而秋季整体降低;(3)关中地区夏、秋季整体植被覆盖度与SPI呈低度正相关,而春、冬季呈低度负相关,无显著相关关系。

Based on MODIS-NDVI products and the rainfall time series data, we analyzed the spatial pattern and change trend of seasonal vegetation coverage in Guanzhong Area from 2003 to 2014, and discussed the correlation between vegetation coverage and standard precipitation index(SPI). The results show that(1)during the study period, the vegetation coverage of I-15 in the three ecological zones of Guanzhong Area is the highest, the vegetation coverage of I-11 is the highest in spring and the vegetation coverage of I-12 is highest in summer.(2) There is a slight increase in vegetation coverage in spring, summer and winter, while the whole vegetation coverage decreases in autumn.(3)There is a positive correlation between the total vegetation coverage and SPI in summer and autumn, but there is no significant correlation between vegetation coverage and SPI in spring and winter.