基于MODIS影像与NDVI数据的玉树地区土地荒漠化面积变化趋势研究

STUDY ON THE CHANGE TREND OF LAND DESERTIFICATION AREA BASED ON MODIS NDVI DATA IN YUSHU REGION

利用MODIS影像长时间序列数据与同期气象观测资料,通过归一化植被指数,对2011~2020年玉树州荒漠化土地进行动态评估。结果显示:玉树州荒漠化土地主要分布在玉树州北部,与柴达木盆地相连的地带,玉树州南部高海拔地区也有零星荒漠化土地存在;近10a来,玉树州土地荒漠化总面积呈波动性减少趋势,总体向好发展;年降水量、年平均地温与玉树地区土地荒漠化面积有较明显的对应关系,降水量大、地温高,荒漠化土地面积相对较小。年均气温与荒漠化面积无明显的对应关系。建议适时开展人工增雨作业,可有效较少土地荒漠化。

using MODIS long time series data and meteorological data in the period,through the normalized difference vegetation index,to carry on the dynamic assessment of the Yushu prefecture desertification from 2011 to 2020,the results showed that Yushu prefecture northern land desertification are mainly distributed in Yushu prefecture,connected to the qaidam basin area,Yushu prefecture in southern high altitudes scattered land desertification are also exist;In recent 10 years,the total area of desertification in Yushu Prefecture showed a decreasing trend with fluctuation,and the overall development was good.The annual precipitation,annual mean ground temperature and desertification area in Yushu area have obvious corresponding relationship,the desertification area is relatively small with high precipitation and high ground temperature.There was no obvious correlation between annual temperature and desertification area.It is suggested to carry out artificial rainfall enhancement in time to reduce desertification effectively.