| 毛乌素沙地西南缘不同土地利用类型土壤颗粒分形特征 |
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| 引用本文： | 董智今,展秀丽,丁小花.毛乌素沙地西南缘不同土地利用类型土壤颗粒分形特征[J].水土保持研究,2022,29(3):43-48+56. |
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| 作者姓名： | 董智今 展秀丽 丁小花 |
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| 作者单位： | (1.宁夏大学 地理科学与规划学院, 银川750021; 2.西北农林科技大学 资源环境学院, 陕西 杨凌712100) |
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| 摘 要： | 为揭示毛乌素沙地西南缘农田、荒地、草地、灌丛沙堆和林地等土地利用类型的土壤分形特征与防风固沙效果的关系,采用野外取样与室内粒度分析相结合的方法,分析了该区5种土地利用类型的土壤颗粒粒径分布、分形维数以及土层深度与分形维数间关系。结果表明:(1)草地、灌丛沙堆以及林地的土壤粒度组成以极细沙、细沙和中砂为主,耕地和荒地则以粉粒和细砂为主;(2)研究区不同土地利用方式的土壤粒径分布和分形维数差异明显,荒地>农田>灌丛沙堆>草地>林地,随土层深度增加,林地分形维数值减小,草地分形维数值增大,荒地、农田和灌丛沙堆分形维数值变化不大;(3)分形维数与<100 μm和>100 μm粒径含量分别呈显著正相关和负相关,其大小由<100 μm的极细砂粒和粉粒含量决定。研究区内5种土地利用类型土壤颗粒粒径分布与分形维数差异显著,这综合反映出在不同植被效应与人为耕作后,土壤的颗粒组成会发生明显变化。研究结果可为毛乌素沙地西南缘防沙治沙以及土壤恢复提供理论依据。
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| 关 键 词： | 土壤颗粒 分形维数 防沙治沙 毛乌素沙地西南缘 |
Fractal Features of Soil Particles Under Different Land Uses in the Southwestern Edge of the Mu Us Sandy Land |
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| DONG Zhijin,ZHAN Xiuli,DING Xiaohua.Fractal Features of Soil Particles Under Different Land Uses in the Southwestern Edge of the Mu Us Sandy Land[J].Research of Soil and Water Conservation,2022,29(3):43-48+56. |
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| Authors: | DONG Zhijin ZHAN Xiuli DING Xiaohua |
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| Affiliation: | (1.School of Geography and Planning, Ningxia University, Yinchuan 750021, China; 2.College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China) |
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| Abstract: | In order to reveal the relationship between fractal features of soil particles and the effect of erosion control and sand fixation in land use types such as farmland, wasteland, grassland, scrub sand pile and forest land in the Mu Us sandy land, a method combining field sampling and indoor analysis was used to analyze the distribution of the size of soil particle, fractal dimension and the relationship between soil depth and fractal dimension for five land use types in this region. The results show that:(1)the particle size compositions of the soils in grassland, scrub sands and woodland are dominated by very fine sand, fine sand and middle sand, while particle size compositions in arable land and wasteland was dominated by silt and fine sand;(2)the soil particle size distribution and fractal dimension of the different land uses in the studied area differed significantly, with the order: wasteland>farmland>scrub sand pile>grassland>woodland; with the increase of soil depth, the fractal dimension value of woodland decreases, that of grassland increases, and that of wasteland, farmland and scrub sand pile does not change much;(3)the fractal dimension has highly and significantly positive correlation with <100 μm grain size content and negative correlation with >100 μm grain size content, the size of which is determined by the <100 μm very fine sand and fine silt contents. In conclusion, the distributions of the sizes of soil particles and fractal dimension of the five land use types in the studied region have significant distinction, which mirrors the changes of the particle composition caused by different types of vegetation effects and human regulation of tillage. It can also be a reflection of the soil degradation in southwestern edge of Mu Us sandy land, and provide theoretical evidence for soil restoration. |
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| Keywords: | soil particles fractal dimension sand-control Mu Us sandy land |
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