太行山区土壤饱和导水率及其各向异性剖面分布规律
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作者单位:

1.中国科学院遗传与发育生物学研究所农业资源研究中心;2.河北省地质矿产勘查开发局国土资源勘查中心(河北省矿山和地质灾害应急救援中心)

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中图分类号:

S152.7

基金项目:

国家自然科学基金项目( No. 41930651);河北省省级水利科技计划项目(2024-37);中国科学院青年创新促进会项目((No. 2020102)共同资助


Profile distribution of soil saturated water conductivity and its anisotropy in Taihang Mountain area
Author:
Affiliation:

1.Center for Agricultural Resources Research,Institute of Genetics and Developmental Biology,Chinese Academy of Sciences;2.Hebei Provincial Geological and Mineral Exploration and Development Bureau Land and Resources Exploration Center (Hebei Provincial Mine and Geological Disaster Emergency Rescue Center)

Fund Project:

National Natural Science Foundation of China, No. 41930651; Provincial Water Science and Technology Project of Hebei Province (2024-37); Supported by Youth Innovation Promotion Association, Chinese Academy of Sciences (No. 2020102)

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    摘要:

    土壤饱和导水率(Soil saturated hydraulic conductivity,)及其各向异性比对土壤水文过程有着极其重要的影响,然而,Ks各向异性垂直分布特征及其影响因素仍不明确。本研究通过测定太行山区典型坡地三个坡位不同土壤层次垂直与水平方向上、毛管孔隙度、总孔隙度、含水量、容重、土壤机械组成、有机质含量等土壤基本物理性质,应用相关分析等方法,研究了及其他土壤性质的剖面分布特征。同时,深入探讨了各向异性比的垂直分布规律及其成因。结果显示,上坡位和下坡位土壤在垂直和水平方向上都先随着土壤深度的增加而先增大后减小;中坡位土壤在垂直方向上随土壤深度的增加先增大后减小,而水平方向上随着土壤深度的增加先减小,后增大。上、中、下三坡位土壤各向异性比均与1呈明显差异,表现出明显的各向异性。且上、下坡位水平方向占主导,而中坡位垂直方向占主导地位。Ks各向异性比与土壤容重呈显著性低度相关(r=0.478,p=0.021),与总孔隙度,毛管孔隙度呈显著低度相关(r=-0.467、p=0.025;r=-0.459、p=0.027),与其他土壤理化性质相关性不显著,说明土壤孔隙结构是Ks各向异性比最重要的影响因素。以上结果有助于深入了解土壤及其各向异性的主控因素,同时可为太行山地区坡地土壤水文过程的研究提供支撑。

    Abstract:

    Soil saturated hydraulic conductivity () and its anisotropy ratio play an important role in soil hydrological processes,however, the vertical distribution of Ks anisotropy and its influencing factors remain unclear. In this study,, capillary porosity, total porosity, water content, bulk density, soil mechanical composition, organic matter content and other basic soil physical properties in different vertical and horizontal directions of three typical slopes in Taihang Mountain were measured, and correlation analysis was used to study the profile distribution of and other soil properties. At the same time, the vertical distribution of anisotropy ratio and its causes are discussed. The results showed that soil increased first and then decreased with the increase of soil depth in both vertical and horizontal directions. Soil in the middle slope increased first and then decreased with the increase of soil depth in the vertical direction, but decreased first and then increased with the increase of soil depth in the horizontal direction. The soil anisotropy ratio of the upper, middle and lower slopes was significantly different from that of 1, showing obvious anisotropy. is dominant in the horizontal direction of the upper and lower slopes, while is dominant in the vertical direction of the middle slopes. anisotropy ratio was significantly correlated with soil bulk density (r=0.478, p=0.021), and significantly correlated with total porosity and capillary porosity (r=-0.467, p=0.025. r=-0.459, p=0.027) were not significantly correlated with other soil physical and chemical properties, indicating that soil pore structure is the most important factor affecting anisotropy ratio. The above results are helpful to further understand soil and the main controlling factors of soil anisotropy, and can provide support for the study of slope soil hydrological processes in Taihang Mountains.

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  • 收稿日期:2024-05-23
  • 最后修改日期:2024-06-27
  • 录用日期:2024-07-04
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