Characteristics of soil gravel distribution in karst small watershed and its influencing factors
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摘要: 为探究喀斯特土壤石砾含量的影响因素、形成机制及其分布规律，采集了3 180个土壤样品，分析后寨河流域不同影响因素下土壤石砾含量的分布规律，并利用相关性分析得出了影响后寨河流域土壤石砾含量的主要影响因子。结果表明，坡度、岩性、土层厚度和植被类型是影响土壤石砾含量分布的主要影响因素，其中坡度对喀斯特地区土壤石砾含量的分布特征影响作用最大。在不同坡度条件下，土壤石砾含量的分布规律为：坡度<30°时随坡度增加，土壤石砾含量增大。坡度>30°时随坡度增加，土壤石砾含量减小。不同土层厚度下，土壤石砾含量分布规律为：随土层厚度增加，土壤中石砾含量减少。植被类型不同，土壤石砾含量大小排序为：灌木>草本>乔木。不同岩性发育形成土壤，土壤石砾含量大小排序为：白云岩>石灰岩>泥灰岩>第四纪黄粘土>砂页岩。喀斯特地区岩性决定风化成土速率和土壤石砾总量，是土壤石砾含量的物质来源基础。坡度是促进土壤石砾含量迁移、再分配的驱动因素，植被类型和土层厚度是影响土壤石砾含量的响应因素。Abstract: In order to explore the influencing factors, formation mechanism and distribution of karst soil gravel content, 3,180 soil samples were collected to analyze the distribution features of soil gravel contents influenced by different factors in the Houzhai river basin; and the method of correlation analysis was employed to determine the primary influencing factors. The results show that the slope, lithology, soil thickness and vegetation type are the main factors influencing the soil gravel contents, among which the slope has the greatest influence on the soil gravel content distribution in karst areas. Under the condition of different slopes, the changes of the soil gravel content are as follows: When slope < 30 °, soil gravel content increases with the slope. When the slope > 30 ° soil gravel content decrease with the slope. The results also show that soil gravel content decreases with the increase of soil thickness. The order of soil gravel content in different vegetation types is: shrub > herb > tree. Different lithologies can form soils, in which the order of soil gravel content is: dolomite > limestone > argillaceous limestone > quaternary yellow clay > sand shale. The lithology of karst area has a great impact on the weathering rate and gravel volume of the soil, which is the material source of soil gravel content. The slope is the driving factor to promote migration and redistribution of soil gravel content, while vegetation types and soil-bed thickness are the response factors.
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Key words:
- Karst /
- small watershed /
- soil gravel content /
- influencing factors /
- distribution law
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[1] 时忠杰，王彦辉，熊伟，等.六盘山典型植被类型土壤中石砾对大孔隙形成的影响I JI.山地学报，2007, 25 (5 ): 541-547. [2] 时忠杰，王彦辉，于澎涛，等.六盘山森林土壤中的砾石对渗透性和蒸发的影响I JI.生态学报，2008, 28 (12 ): 6090-6098. [3] 时忠杰，王彦辉，徐丽宏，等.六盘山森林土壤中的砾石对土壤大孔隙特征及出流速率的影响I JI.生态学报，2008, 28（10）:4929-4939. [4] Zhou B B，Shao M A,Shao H B. Effects of rock fragments on water movement and solute transport in a Loess Plateau soil［J］.Comptes rendus-Géosìence, 2009, 341(6). [5] Giacomo C, Colin DC, Anthony C. Rock fragments in soil support a different microbial community from the fme earth.SoilBiology&Biochemistry. 2004, 36:1 119-1128 [6] Stendahl J, Lundin L, Nilsson T. The stone and boulder content of Swedish forest soils. Catena, 2009, 77(3): 285-291 [7] 解迎革,李霞,王国栋,薛绪掌.土壤砾石含量的电阻率断层扫描技术应用研究［J］.土壤通报,2012,43(04):854-860. [8] 张珍明,周运超,田潇,黄先飞.喀斯特小流域土壤有机碳空间异质性及储量估算方法［J］.生态学报,2017,37(22):7647-7659. [9] Zheng H, Su Y R,He X Y，et al. Modified method for estimating the organic carhon density of discontinuous soil in peak-karst regions in Southwest China.Environmental Earth Sciences，2012, 67(6):1743-1755. [10] 黄先飞,周运超,张珍明.喀斯特石漠化区不同土地利用方式下土壤有机碳分布特征［J］.水土保持学报,2017,31(5):215-221. [11] 李燕,高明,魏朝富,刘吉振.土壤砾石的分布及其对水文过程的影响［J］.中国农学通报,2006(5):271-276. [12] 杜阿朋,王彦辉,管伟,何常清,于澎涛,刘建立.六盘山叠叠沟小流域的土壤石砾含量坡面分布特征［J］.水土保持学报,2009,23(5):76-80+127. [13] 李龙，吴丽芝，姚云峰，等.小流域土壤有机碳含量的空间变异特征研究:以内蒙古赤峰市黄花甸子流域为例［J］水土保持研究，2013,20(5):18-23. -
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