Spatio-temporal changes of aeolian desertification in the Jiziwan of the Yellow River from 1975 to 2020

doi:10.7522/j.issn.1000-694X.2024.00018

Journal of Desert Research ›› 2024, Vol. 44 ›› Issue (5): 13-22.DOI: 10.7522/j.issn.1000-694X.2024.00018

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Spatio-temporal changes of aeolian desertification in the Jiziwan of the Yellow River from 1975 to 2020

Sen Li¹(), Zongying Yang², Hongyan Zhao¹^,³, Narentuya², Guixiang An⁴, Jiali Xie¹, Xiaopeng Jia¹, Changzhen Yan¹

^1.Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China
^2.Climate and Eco-Environment Assessment Center，Alxa League Meteorological Bureau，Alxa Left Banner 750300，Inner Mongolia，China
^3.University of Chinese Academy of Sciences，Beijing 100049，China
^4.Gansu Water Resources and Hydropower Survey，Design and Research Institute Co. ，LTD. ，Lanzhou 730030，China

Received:2023-12-11 Revised:2024-01-28 Online:2024-09-20 Published:2024-10-15

Abstract

Abstract:

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. However， as a newly proposed comprehensive strategy region for controlling desertification， the development characteristics and driving factors of desertification in Jiziwan of the Yellow River remain unknown. Based on Landsat series images in Jiziwan of the Yellow River from 1975 to 2020， the desertification data of this study were interpreted 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 River， 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 between 2000 and 2020， mostly in the middle of the Otok Banner in the Mu Us Sandy Land. （3） Changes in desertification in this region are jointly governed by climate change and human activity， but the contribution rate of climate 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 ecological conservation and high-quality development of the Yellow River.

Key words: aeolian desertification, driving forces, climate change, Jiziwan of the Yellow River

CLC Number:

P931.3

Sen Li, Zongying Yang, Hongyan Zhao, Narentuya, Guixiang An, Jiali Xie, Xiaopeng Jia, Changzhen Yan. Spatio-temporal changes of aeolian desertification in the Jiziwan of the Yellow River from 1975 to 2020[J]. Journal of Desert Research, 2024, 44(5): 13-22.

Figures/Tables 7

Fig.1 The location of the study area

Table 1 Grading standard of land desertification degree

沙漠化程度	流沙面积比例/%	植被覆盖度/%	景观特征
轻度沙漠化	<5	>60	地表出现风蚀痕迹，固定沙丘开始活化；植被开始出现退化；有零星流沙出现
中度沙漠化	5~25	30~60	地表风蚀痕迹明显；植被退化，有叶期尚无法覆盖地表；流动面积逐渐扩大，呈现明显的沙丘形态
重度沙漠化	25~50	10~30	原始地表基本消失，风蚀强烈，流动沙丘/半流动沙丘比重较大
极重度沙漠化	>50	<10	流动沙丘/半流动沙丘占比超过一半，分布广泛；植被退化殆尽

Fig.2 The spatial distribution of aeolian desertification in Jiziwan of the Yellow River in 2020

Fig.3 Area change of different aeolian desertification types in Jiziwan of the Yellow River from 1975 to 2020

Fig.4 Flow direction of different aeolian desertification types in Jiziwan of the Yellow River during 1975-2000 （A） and 2000-2020 （B）

Fig.5 Spatial-temporal changes of aeolian desertification types in the Jiziwan of the Yellow River during 1975-2000 （A） and 2000-2020 （B）

Fig.6 Spatial pattern and proportion of different driving factors in aeolian desertification reversal area （A） and development area （B） in the Jiziwan of the Yellow River from 1975 to 2020

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Spatio-temporal changes of aeolian desertification in the Jiziwan of the Yellow River from 1975 to 2020

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