| 摘要: |
| 【 目的】研究阴山北麓荒漠草原沙漠化特征及时空演变规律，并分析了沙漠化对土壤粒度的影响，旨 在为阴山北麓荒漠草原区土地沙漠化防治和生态恢复实践提供科学依据。【 方法】以内蒙古阴山北麓为研究区，基于Landsat遥感影像特征以及290个土壤样品，研究了该地区2000?2024年土地沙漠化的时空分布和变化趋势，并分析 了不同沙漠化程度地表土壤颗粒的粒度特征与分形特征。【 结果】2000?2024年，阴山北麓区域荒漠草原地表沙漠化 程度分为未沙漠化以及轻度、中度、重度、极重度沙漠化5级。随着时间推移，沙漠化程度总体呈下降趋势，其中西北 部地表的沙漠化程度明显高于东南部；沙漠化面积总体表现为减小趋势，其中未沙漠化、重度沙漠化面积变化幅度较 大。荒漠草原地表土壤组分均以细沙组分为主，其在不同沙漠化程度地表土壤含量为24.78%~41.08%；易风蚀土壤 颗粒粒径主要为0.08~0.1和0.7~1 mm。未沙漠化以及轻度、中度、重度和极重度沙漠化程度的土壤颗粒平均粒径 分别为0.18，0.24，0.28，0.42，0.97 mm，分形维数平均值分别为2.82，2.73，2.74，2.70和2.52。分形维数与沙漠化 指数呈显著的负相关关系（R2=0.748），可知分形维数值越小，地表沙漠化程度越严重。【 结论】土壤粒度及分形维数等参数均显示阴山北麓荒漠草原沙漠化程度有所缓解，但表层土壤风蚀颗粒趋向粗粒化方向发展。 |
| 关键词: 沙漠化 土壤粒度 分形维数 荒漠草原 阴山北麓 |
| DOI：10. 13207/j. jnwafu. 2026. 09. 014 |
| 分类号: |
| 基金项目:中国水利水电科学研究院基本科研业务费专项项目（MKYW2024JK022）；内蒙古自治区自然科学基金项目（2025QN04035） |
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| Relationship between desertification and soil grain size in desert grassland at the northern foot of Yinshan Mountains |
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LIU Xiya1,2, WANG Haibing3, ZHAOTianqi1,2, YANG Zhibo4, WU Di3
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1.Yinshanbeilu Grassland Eco-hydrology National Observation and Research Station，Hohhot，Inner Mongolia 010020，China;2.Institute of Pastoral Hydraulic Research，Ministry of Water Resources of the People’s Republic of China，Hohhot，Inner Mongolia 010020，China;3.Inner Mongolia Agriculture University，State Key Laboratory of Water Engineering Ecology and Environment in Arid Area，Hohhot，Inner Mongolia 010018，China;4.Bayannur Municipal Water Conservancy Service Center，Bayannur，Inner Mongolia 015000，China
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| Abstract: |
| 【 Objective】This study aimed to study the characteristics and spatiotemporal dynamics of desertification in the the northern foot of the Yinshan Mountains，and its influence on soil grain size，providing a scientific basis for land desertification control and ecological restoration in the northern foot of Yinshan Mountains. 【Method】In the northern foot of Yinshan Mountains in Inner Mongolia，based on the Landsat remote sensing image features and 290 soil samples，spatiotemporal distribution and change trends of land desertification from 2000 to 2024 were studied，and the particle size characteristics and fractal characteristics of surface soil particles in areas with different desertification degrees were also analyzed.【Result】From 2000 to 2024，the degree of desertification of desert grassland in the northern foot of Yinshan Mountains was divided into five levels：non-desertified，mild，moderate，severe and extremely severe. Over this period，the degree of desertification generally showed a downward trend，with significantly higher levels in the northwest compared to the southeast. The desertified area showed a decreasing trend，in which the non-desertified and severe desertified area changed greatly. The surface soil of desert grassland was dominated by fine sand，which accounted for 24.78% to 41.08% in the surface soil under different degrees of desertification. The particle sizes of wind-erodible soil were 0.08?0.1 and 0.7?1 mm respectively. The average particle sizes of soil particles under non-desertified，mild，moderate，severe and extremely severe desertification were 0.18，0.24，0.28，0.42，and 0.97 mm，and the mean fractal dimensions were 2.82，2.73，2.74，2.70 and 2.52，respectively. A significant negative correlation existed between fractal dimension and desertification index（R2=0.748），indicating that the smaller the fractal dimension，the worse the surface desertification.【Conclusion】 Parameters including soil particle size and fractal dimension all showed that the desertification degree of desert grassland at the northern foot of Yinshan Mountains has been alleviated，but the wind erosion particles of surface soil tend to be coarse-grained. |
| Key words: desertification soil grain size fractal dimension desert steppe the northern foot of Yinshan |
