黄土丘陵沟壑区退耕年限对根—土复合体抗剪强度的影响

邢书昆; 张光辉; 朱平宗

doi:10.13870/j.cnki.stbcxb.2021.04.007

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黄土丘陵沟壑区退耕年限对根—土复合体抗剪强度的影响

更新时间：2025-03-12

- 黄土丘陵沟壑区退耕年限对根—土复合体抗剪强度的影响
- Effects of Vegetation Restoration Age on Shear Strength of Root-soil System in Hilly and Gully Region of the Loess Plateau
- 水土保持学报 2021年35卷第4期页码：41-48
- 作者机构：
  
  1. 北京师范大学地理科学学部,北京,100875
  2. 北京师范大学地表过程与资源生态国家重点实验室,北京,100875
- 作者简介：
  
  [ "邢书昆(1996-),男,山东聊城人,硕士研究生,主要从事土壤侵蚀研究。E-mail:201921051020@mail.bnu.edu.cn" ]
- 基金信息：
  
  国家重点研发计划项目（2017YFC0504702）国家自然科学基金重点项目（41530858）
- DOI：10.13870/j.cnki.stbcxb.2021.04.007
  中图分类号： S157.1
- 纸质出版：2021
- 稿件说明：
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邢书昆, 张光辉, 朱平宗. 黄土丘陵沟壑区退耕年限对根—土复合体抗剪强度的影响[J]. 水土保持学报, 2021,35(4):41-48.

XING Shukun, ZHANG Guanghui, ZHU Pingzong. Effects of Vegetation Restoration Age on Shear Strength of Root-soil System in Hilly and Gully Region of the Loess Plateau[J]. 2021, 35(4): 41-48.
邢书昆, 张光辉, 朱平宗. 黄土丘陵沟壑区退耕年限对根—土复合体抗剪强度的影响[J]. 水土保持学报, 2021,35(4):41-48. DOI： 10.13870/j.cnki.stbcxb.2021.04.007.

XING Shukun, ZHANG Guanghui, ZHU Pingzong. Effects of Vegetation Restoration Age on Shear Strength of Root-soil System in Hilly and Gully Region of the Loess Plateau[J]. 2021, 35(4): 41-48. DOI： 10.13870/j.cnki.stbcxb.2021.04.007.

摘要

退耕还林（草）工程的有效实施，导致黄土高原植被迅速恢复，势必会引起植物根系和土壤理化性质变化，影响根—土复合体抗剪强度。为探究植被恢复年限对根—土复合体抗剪强度的潜在影响，在陕西省安塞区纸坊沟小流域选择6个不同退耕年限（5，12，20，27，37，46年）的撂荒地和1个坡耕地，进行不同土层深度（0—10，10—20，20—30，30—40，40—50 cm）根—土复合体原位剪切试验，同时测定根系特性和土壤理化性质。结果表明，随着退耕年限增加，0—50 cm土层根—土复合体抗剪强度均值呈"S"形增大趋势（51.80~124.01 J/m2），与坡耕地相比，抗剪强度依次增加2.5%，54.6%，48.7%，86.5%，139.4%和129.3%。除坡耕地外，随着土层深度增加，根系密度明显减少，根—土复合体抗剪强度逐渐下降。根—土复合体抗剪强度与土壤有机质含量、根长密度和根质量密度呈对数正相关关系，与团聚体稳定性和有效根密度呈线性正相关关系。通径分析表明，团聚体稳定性、根质量密度和有机质含量是影响根—土复合体抗剪强度的关键因素。研究结果为评估植被恢复的水土保持效益及生态服务功能、揭示根—土复合体抗剪强度随退耕年限变化的动力机制提供理论基础。

Abstract

The effective implementation of the "grain-for-green" project has rapidly restored vegetation on the Loess Plateau

which will inevitably trigger the changes in plant roots and soil physical and chemical properties

and further affect the shear strength of root-soil system. To investigate the potential impacts of vegetation restoration age on shear strength of root-soil system

six abandoned farmlands with different restoration age (5

37 and 46 years) and a slope farmland were selected as testing sites in Zhifanggou small watershed in Ansai

Shaanxi province. The in-situ shear tests were conducted in five different soil depths (0—10

10—20

20—30

30—40

40—50 cm)

and root characteristics and soil physical and chemical properties were measured simultaneously. The results showed that the average shear strength of 0—50 cm soil layers increased as a sigmoid curve from 51.80 J/m2 to 124.01 J/m2 with the increasing of vegetation restoration age. Compared with slope farmland

the shear strength of root-soil system increased by 2.5%

54.6%

48.7%

86.5%

139.4% and 129.3% for abandoned farmlands with different restoration ages

respectively. The root density decreased significantly with the increasing of soil depth in the abandoned farmlands

which induced decrease in the shear strength of root-soil system. The shear strength of root-soil system was logarithmically positively correlated with organic matter content

root length density and root mass density

and linearly positively correlated with aggregate stability and root density. Path analysis showed that aggregate stability

root mass density and organic matter content were the key factors affecting the shear strength of root-soil system. The results could provide a theoretical basis for evaluating water and soil conservation benefit and ecological service functions of vegetation restoration

and revealing the dynamic mechanism of changes in shear strength of root-soil system with the vegetation restoration age.

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