归一化植被指数在鄂湘赣三省的时空变化分析

基于鄂湘赣地区2007—2018年不同时间尺度的归一化植被指数(NDVI),通过线性趋势分析法、曼肯德尔秩和检验(M-K)和距平法对鄂湘赣地区的植被状态进行时空分析。结果表明,在2007、2008、2009、2010、2011和2013年NDVI低于年平均值的区域面积占50%以上;在1—12月鄂湘赣地区NDVI的增长区域面积占比39%~82%;春季、夏季、秋季和冬季NDVI的增长区域面积占44%~81%,其中春季大于冬季大于夏季大于秋季。总体来看,2007—2018年鄂湘赣地区的植被状态受气象条件影响较大但处于逐渐好转的情况。

Based on the normalized difference vegetation index(NDVI) at different time scales from 2007 to 2018 in Hubei-Hunan-Jiangxi region,this paper makes a spatio-temporal analysis of the vegetation state in this region by means of linear trend analysis,Mann-Kendall method(M-K) and anomaly method.The results show that,the area whose NDVI is lower than the annual average in 2007,2008,2009,2010,2011 and 2013 accounts for more than 50%;from January to December,the area of NDVI growth in Hubei,Hunan and Jiangxi accounted for 39% ~82%;the growth area of NDVI in spring,summer,autumn and winter accounts for 44% ~81%,of which spring > winter > summer > autumn.Generally speaking,from 2007 to 2018,the vegetation state of Hubei,Hunan and Jiangxi is greatly affected by meteorological conditions,but it is gradually improving.