Spatio-temporal changes of aeolian desertification in the Jiziwan of the Yellow River from 1975 to 2020
The Jiziwan of the Yellow River is the core area of the Three North Projects in the modern age,which plays a significant role in supplying sediment to the middle and lower portions of the Yellow River.Howev-er,as a newly proposed comprehensive strategy region for controlling desertification,the development character-istics and driving factors of desertification in Jiziwan of the Yellow River remain unknown.Based on Landsat se-ries images in Jiziwan of the Yellow River from 1975 to 2020,the desertification data of this study were interpret-ed using a combination of object-oriented and visual interpretation methods,and the spatio-temporal changes of desertification and its driving factors were quantitatively analyzed.The main conclusions are as follows:(1)Temporally,with 2000 serving as the time node,the trend of desertified land in Jiziwan of the Yellow Riv-er,began to shift initially and subsequently reversed.The extent of desertification has reversed to be comparable with that in 1975,but the desertified area has only reversed to the level of 1990.(2)Spatially,there was partial reversal but overall deterioration between 1975 and 2000,and general reversal with localized deterioration be-tween 2000 and 2020,mostly in the middle of the Otok Banner in the Mu Us Sandy Land.(3)Changes in desert-ification in this region are jointly governed by climate change and human activity,but the contribution rate of cli-mate change is substantially higher than that of human activities.The research results can provide support for combating desertification in Jiziwan of the Yellow River and the ecological protection,as well as promoting eco-logical conservation and high-quality development of the Yellow River.
aeolian desertificationdriving forcesclimate changeJiziwan of the Yellow River
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NSTL
万方数据
