水土保持研究2024，Vol.31Issue(3)：30-41,48,13.DOI:10.13869/j.cnki.rswc.2024.03.030
基于地形梯度的典型退耕区土壤侵蚀时空分异特征研究
Study on Spatial and Temporal Variations of Soil Erosion in Typical Farmland Conversion Area Based on Topographic Gradient
摘要
Abstract
[Objective]The aims of this study are to explore the characteristics of spatial and temporal dynamics of soil erosion in typical farmland conversion area under different topographic conditions before and after the'Grain for Green'project,and to provide scientific support for consolidating project results.[Methods]The RUSLE model was used to quantitatively analyze the spatial and temporal evolution characteristics of soil erosion intensity in Yan'an City from 1989 to 2019,and the distribution patterns of soil erosion on various elevations and slopes were explored in combination with topographic factors.The precipitation,vegetation and soil and water conservation factor affecting the change of soil erosion modulus were decomposed by the LMDI model and their contribution values were analyzed.The CA-Markov model was used to predict the soil erosion status of Yan'an City in 2029.[Results]The average soil erosion modulus in Yan'an City in 1989,1999,2009 and 2019 were 12 554.80 t/(km2·a),8 237.17 t/(km2·a),5 936.57 t/(km2·a)and 4 473.02 t/(km2·a),respectively.The erosion type was dominated by slight erosion,showing the spatial differentiation characteristics of low level in the south and high level in the north.The soil erosion intensity generally decreased with the increase of elevation,but the erosion increased at the fifth elevation.The soil erosion intensity was consistent with the slope gradient,and the erosion intensity increased with the increase of slope gradient.The inhibitory effect of vegetation factor and soil and water conservation factor on soil erosion had increased in recent years.The soil erosion situation in Yan'an City will be generally improved in 2029.[Conclusion]The soil erosion status in Yan'an City has improved significantly,but there is still the increased erosion in some areas.In the future,the high-altitude areas in the north and the bank areas of the Yellow River in the east of Yan'an City should be given more attention,meanwhile,the monitoring of high-slope areas should be strengthened.关键词
土壤侵蚀/RUSLE/LMDI/CA-Markov/延安市Key words
soil erosion/RUSLE/LMDI/CA-Markov/Yan'an City分类
农业科技引用本文复制引用
高毅丰,韩磊,火红,赵子林,常钰卿,刘钊,曹鑫鑫,杨梅丽,李亚北..基于地形梯度的典型退耕区土壤侵蚀时空分异特征研究[J].水土保持研究,2024,31(3):30-41,48,13.基金项目
国家自然科学基金项目(41871190) （41871190）
陕西省重点研发计划(2021SF-440) （2021SF-440）
长安大学中央高校基本科研业务费专项资金(300102353201) （300102353201）
黄土与第四纪地质国家重点实验室开放基金(SKLLQG2002) （SKLLQG2002）
