喀斯特小流域土壤饱和导水率垂直分布特征
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

基金项目:

国家重点基础研究发展计划(973计划)项目(2015CB452703)和国家自然科学基金项目(41171187和51379205)资助


Vertical distribution of soil saturated hydraulic conductivity in a small karst catchment
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    土壤剖面饱和导水率(Saturated hydraulic conductivity, Ks)的垂直分布对土壤水文过程有极其重要的影响,但在地质背景特殊的喀斯特地区其研究还相对匮乏。通过测定典型喀斯特小流域内23个土壤剖面(0~10、10~20、20~30、30~50、50~70、70~100 cm)土壤Ks及土壤碎石含量(Rock fragment content, RC)、容重(Bulk density, BD)、毛管孔隙度(Capillary porosity, CP)、非毛管孔隙度(Non-capillary porosity, NCP)、土壤有机碳(Soil organic carbon, SOC)等土壤性质,并结合各样点的坡位(Slope position, SP)、坡度(Slope gradient, SG)、坡向(Slope aspect, SA)、裸岩率(Bare rock, BR)、土地利用类型(Land-use type, LU)等环境因素,应用偏相关分析和典范对应分析(CCA)的方法,研究了喀斯特小流域Ks的垂直分布特征及其主要影响因素。结果表明, Ks随土壤深度的增加而减小并可用对数函数模拟(R2=0.848)。20~100 cm各层Ks变幅较小且变异接近,因此在水文模型中可用20~30 cm土壤Ks代替深层。土壤性质中,RC与Ks的相关系数(0.484)最大。环境因素对Ks垂直分布的影响依次为SP > SG > SA > LU > BR。由此可知,RC是影响Ks最重要的土壤性质,而SP则是影响Ks垂直分布最重要的环境因素。该结果有利于弄清喀斯特地区降雨入渗规律及其主要影响因素,为小流域植被恢复及水文模型的构建提供科学依据。

    Abstract:

    Vertical distribution of saturated hydraulic conductivity (Ks) has an important influence on soil hydrological processes. However, relatively speaking, few reports are available on this issue in karst areas with special geologic background. To study vertical distribution of soil saturated hydraulic conductivity (Ks) and its influencing factors in a small karst catchment, soil samples were collected from 23 soil profiles at 0~10, 10~20, 20~30, 30~50, 50~70 and 70~100 cm soil layers for measurement of Ks, rock fragment content (RC), bulk density (BD), capillary porosity (CP), non-capillary porosity (NCP) and soil organic carbon (SOC). Besides, environmental factors including slop position (SP), slope gradient (SG), slope aspect (SA), bare rock (BR) and land use type (LU) were investigated at each soil profile site, and all the data obtained were analyzed with the partial correlation analysis and canonical correspondence analysis (CCA) methods. Results show that Ksgenerally decreased with increasing soil depth and the variation could be fitted with a logarithmic function (R2=0.848). The variation of Ks in the soil layers within 20~100 cm was low in amplitude and approximate to each other, which indicates that Ks in the 20~30 cm soil layer could be used to represent Ks in the underlying horizons in building hydrological models. Among the soil properties, RC displayed the highest correlation coefficient (0.484) with Ks. In terms of influences of the environmental factors on vertical distribution of Ks, a decreasing order of SP > SG > SA > LU > BR was found. It is, hence quite obvious that RC is the most important soil property and SP the dominant environmental factor that influences vertical distribution ofKs. The findings help understand the laws and major influencing factors of rainfall infiltration and also provide some scientific basis for vegetation restoration in small karst catchments and for building of hydrological models, as well.

    参考文献
    相似文献
    引证文献
引用本文

付同刚,陈洪松,王克林.喀斯特小流域土壤饱和导水率垂直分布特征[J].土壤学报,2015,52(3):538-546. DOI:10.11766/trxb201406240321 Fu Tonggang, Chen Hongsong, Wang Kelin. Vertical distribution of soil saturated hydraulic conductivity in a small karst catchment[J]. Acta Pedologica Sinica,2015,52(3):538-546.

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2014-06-24
  • 最后修改日期:2014-09-21
  • 录用日期:2015-01-12
  • 在线发布日期: 2015-03-02
  • 出版日期: