塔里木河流域的绿洲迁移研究

绿洲是干旱区社会经济发展的根基,是干旱区生态保护的核心.理解和定量表征环境变化下绿洲的演化规律是沙漠治理和绿洲保护的关键科学问题.选用2002-2018年MODIS 土地分类数据集MCD12Q1,计算绿洲动态度、绿洲重心、不同土地类型的绿洲化贡献率、林草水域与社会经济用地的转化率四个指标,对塔里木河流域及其四大源流流域...

Understading the evolution of the Tarim River Oasis

Oasis is the foundation of social and economic development and the core of ecological protection in arid areas． Understanding and quantitatively depicturing the evolution of oasis in a changing environment is a critical issue underlying the desert governance and the oasis restoration． In doing so，four indicators for revealing the oasis evolution process were established，including the oasis dynamic degree，the oasis gravity center，the contribution rate of different land types to oasis evolution，and the transformation rate between WGW( woodland，grassland and waters) and UC ( urban and cultivated) land． The indicators were applied to the Tarim River Basin，China，using the MODIS land classification data set MCD12Q1 from 2002 to 2018． The results showed that: ( 1) the area of Tarim oasis expanded significantly by 28. 3% from 2002 to 2018; ( 2) as the gravity center of the oasis upstream the river trended to get closer to the geographic center of the whole Tarim River Basin，the gravity center of the oasis across the whole Tarim River Basin trended to move from north to south; ( 3) the contributions from the changes of woodland and cultivated land to the oasis evolution is less significant than that from the changes of water surface and grassland; ( 4) there also was a significant trend that the WGW was transferred to the UC land during 2002 to 2018． Those founding provided an explicit picture of the migration and evolution of the Tarim River oasis since 2002，which is valuable for the environmental governance of the Tarim River and other arid basins．