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应用生态学报 ›› 2020, Vol. 31 ›› Issue (7): 2431-2440.doi: 10.13287/j.1001-9332.202007.029

• 研究论文 • 上一篇    下一篇

花岗岩崩岗不同部位土壤饱和导水率特征及其影响因素

黄婉霞1, 邓羽松1*, 谢福倩1,4, 杨钙仁1, 蒋代华2, 黄智刚2,3   

  1. 1广西大学林学院, 南宁 530004;
    2广西大学农学院, 南宁 530004;
    3中国农业科学院农业环境与可持续发展研究所, 北京 100081;
    4广西壮族自治区水土保持监测站, 南宁 530023
  • 收稿日期:2019-11-18 接受日期:2020-05-07 出版日期:2020-07-15 发布日期:2021-01-15
  • 通讯作者: E-mail: denny2018@gxu.edu.cn
  • 作者简介:黄婉霞, 女, 1996年生, 硕士研究生。主要从事土壤侵蚀与水土保持等方面的研究。E-mail: Wan_Xia@163.com
  • 基金资助:
    国家自然科学基金重点项目(41630858)和国家重点研发计划项目(2017YFC0505402)资助

Characteristics of soil saturated hydraulic conductivity on different positions and their controlling factors of granite collapsing gullies

HUANG Wan-xia1, DENG Yu-song1*, XIE Fu-qian1,4, YANG Gai-ren1, JIANG Dai-hua2, HUANG Zhi-gang2,3   

  1. 1College of Forestry, Guangxi University, Nanning 530004, China;
    2College of Agriculture, Guangxi University, Nanning 530004, China;
    3Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China;
    4Soil and Water Conservation Monitoring Station of Guangxi Zhuang Autonomous Region, Nanning 530023, China
  • Received:2019-11-18 Accepted:2020-05-07 Online:2020-07-15 Published:2021-01-15
  • Contact: E-mail: denny2018@gxu.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (41630858) and the National Key Research and Development Program of China (2017YFC0505402).

摘要: 崩岗是我国南方花岗岩丘陵区普遍存在的水力-重力复合土壤侵蚀现象。为探究崩岗的土壤水力学性质与侵蚀机理的内在联系及其与影响因素之间的关系,选择桂东南活动型、半稳定型和稳定型3种花岗岩崩岗为对象,研究不同部位土壤饱和导水率的空间变化及其影响因素。结果表明:1)崩岗土壤饱和导水率在不同部位呈波动分异,其中崩壁中部为最小值,崩积堆上部为最大值,其次为洪积扇顶端。2)选取Cosby、Compbell、Julià、Hypre 4种土壤饱和导水率传递函数对该区土壤饱和导水率进行拟合,结果预测值与实测值均存在偏差。3)相关性分析表明,土壤饱和导水率与毛管孔隙度、黏粒含量呈极显著负相关关系,与非毛管孔隙和砂粒含量呈极显著正相关关系。4)通径分析表明,砂粒含量为崩岗土壤饱和导水率的主要影响因素,其次为非毛管孔隙度和土壤容重,其中砂粒含量与非毛管孔隙度对土壤饱和导水率呈正效应,容重呈负效应。研究结果可为揭示崩岗侵蚀机理和防治提供理论依据。

关键词: 饱和导水率, 花岗岩崩岗, 桂东南区, 土壤传递函数

Abstract: Collapsing gully is a common phenomenon of hydraulic-gravity combined soil erosion in granite hilly area of south China. The study aimed to explore the relationship between soil hydraulics pro-perties and erosion mechanism and the intrinsic controlling factors. The active, semi-stable, and stable types of granite collapsing gullies in southeastern Guangxi were selected to examine the spatial variation of soil saturated hydraulic conductivity and identify the influencing factors. Main results were as follows: 1) Soil saturated hydraulic conductivity of collapsing gullies fluctuated on different positions, with the bottom of collapsing wall showing the minimum value, the top of colluvial deposit showing the maximum, and followed by the top of alluvial fan. 2) All the models being selected to model the soil saturated hydraulic conductivity, including Cosby, Compbell, Julià, and Hypre, performed poor. 3) Results of correlation analysis showed that soil saturated hydraulic conductivity was negatively correlated with capillary porosity and clay content, and positively correlated with non-capillary porosity and sand content. 4) Results of path analysis showed that sand content was the most influencing factor in controlling soil saturated hydraulic conductivity of collapsing gullies, followed by non-capillary porosity and soil bulk density, where sand content and non-capillary porosity exerted a positive effect and bulk density exerted a negative one. Our findings will provide theoretical basis for the mechanistic understanding and prevention of collapsing gullies erosion.

Key words: soil saturated hydraulic conductivity, granite collapsing gully, southeast Guangxi, pedo-transfer function