基于VCI的1999-2019年贵州省农业干旱演变特征

Characteristics of Agricultural Drought Evolution from 1999 to 2019 based on Vegetation Condition index in Guizhou Province

鉴于贵州省具有西南地区独特的喀斯特地貌特征,农业干旱现象较为严重的问题,文章利用遥感技术并采用植被状态指数VCI以揭示1999-2019年贵州省农业干旱演变特征。结果表明:VCI多年间的均值位于0.1-0.9之间,最小值0.112出现在1999年2月,最大值0.789出现在2016年8月。整体上来看,VCI可以较好反映贵州省的农业干旱特征,7月至8月期间降水量的逐渐增加是导致植被长势良好的主要原因。

In view of the unique karst geomorphic characteristics of southwest China and the serious problem of agricultural drought in Guizhou Province,remote sensing technology and vegetation condition index VCI were used to reveal the evolution characteristics of agricultural drought in Guizhou from 1999 to 2019.The results indicated that the average VCI values were in 0.1-0.9,with the minimum value of 0.112 appearing in February 1999 and the maximum value of 0.789 appearing in August 2016.On the whole,VCI can better reflect the agricultural drought characteristics in Guizhou,and the gradual increase of precipitation from July to August is the main reason for the good growth of vegetation.