岩溶槽谷区不同土地利用方式土壤入渗规律研究
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高等学校博士学科点专项科研基金(200806350008);国家重点基础研究发展计划(2008CB417208);岩溶动力学重点实验室开放课题(kdl2008-06;桂科能0842008);科技部国际科技合作项目(2008GR1256)


Infiltration Characteristics Under Different Landuses in Karst Valley Area
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    摘要:

    在保持原状土条件下,采用张力入渗仪(盘径d=20cm,负压h0=-5cm)对重庆市青木关典型岩溶槽谷区不同土地利用类型土壤渗透性进行了研究。结果表明,在试验条件下,不同土地利用类型土壤渗透性存在明显差别。以旱地土壤渗透性能最好,而荒地较差。旱地非饱和导水率、稳定入渗率、累积入渗量随土层深度加深而减小,而林地各项入渗指标却随土层深度的加深而增加。荒地15—30cm层非饱和导水率、稳定入渗率、累积入渗量均较30—45cm层低。土壤容重、孔隙度与土壤入渗性能关系密切,而初始含水量仅与初始入渗率有关,其相关系数为-0.825**。各土地利用类型入渗过程的模拟结果表明,Kostialov水分入渗模型对所研究区不同土地利用类型土壤水分拟合度较好,拟合度约为0.765,对该区研究土壤水分入渗过程具有良好的适用性。

    Abstract:

    By maintaining the original conditions of undisturbed soil in typical profiles,tension infiltrometer(d=20 cm,h0=-5 cm)was used to measure soil infiltration under three different patterns of landuse in Qingmuguang karst valley. Results showed obvious differences in soil infiltration capability among three different patterns of landuse. Dryland behaved the best infiltration capability and wasteland,the worst. Unsaturated conductivity,stable infiltration rate,and accumulated infiltration in dryland decreased with soil depth,while the indicators behaved an opposite tendency in woodland. Furthermore,unsaturated conductivity,stable infiltration rate,and accumulated infiltration in the 15—30 cm soil layer were lower than those in the 30—45 cm soil layer in wasteland. Soil bulk density and soil porosity had significant correlations with the properties of soil infiltration,but initial soil water content solely significantly influenced initial infiltration rate,with the correlation coefficient being-0.825. According to the simulation infiltration experiments,an applicable result was achieved by Kostialov model in simulating infiltration process in karst valley under different patterns of landuse and the fitted value was 0.765.

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刘丽红,蒋勇军,王翱宇,苟鹏飞.岩溶槽谷区不同土地利用方式土壤入渗规律研究[J].水土保持通报,2010,(4):51-55,59

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  • 收稿日期:2009-12-21
  • 最后修改日期:2010-03-01
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  • 在线发布日期: 2014-11-26
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