Effect of Freeze-Thaw Cycles on Soil Aggregate Stability and Microstructure of Black Soil

WANG Wengang; WANG Bin; GU Wangming; CHEN Zuming; JIANG Yaoyu

doi:10.13870/j.cnki.stbcxb.2022.01.010

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Effect of Freeze-Thaw Cycles on Soil Aggregate Stability and Microstructure of Black Soil

更新时间：2025-03-12

- Effect of Freeze-Thaw Cycles on Soil Aggregate Stability and Microstructure of Black Soil
- Vol. 36, Issue 1, Pages: 66-73(2022)
- 作者机构：
  
  1. 北京林业大学水土保持学院,北京,100083
  2. 重庆缙云山三峡库区森林生态系统国家定位观测研究站,北京,100083
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2022.01.010
  CLC： S157.1
- Published：2022
- 稿件说明：
移动端阅览
WANG Wengang, WANG Bin, GU Wangming, et al. Effect of Freeze-Thaw Cycles on Soil Aggregate Stability and Microstructure of Black Soil[J]. 2022, 36(1): 66-73.
DOI：

WANG Wengang, WANG Bin, GU Wangming, et al. Effect of Freeze-Thaw Cycles on Soil Aggregate Stability and Microstructure of Black Soil[J]. 2022, 36(1): 66-73. DOI： 10.13870/j.cnki.stbcxb.2022.01.010.

摘要

冻融循环作用下的土壤结构变化被认为是融雪期黑土坡面土壤侵蚀加剧的主要原因之一

土壤团聚体稳定性与团聚体微结构是影响土壤可蚀性的关键因子。基于控制条件土壤冻融模拟试验

采用湿筛法、扫描电子显微技术(SEM)和Image-Pro Plus(IPP)图像分析处理相结合的方法

分析了冻融循环过程中黑土团聚体微结构的动态变化特征

阐明了土壤团聚体水稳定性与团聚体微结构特征的内在联系。结果表明: (1)冻融循环对黑土团聚体水稳定性整体呈破坏作用。该作用在微观层面上表现为冻融循环驱动土壤孔隙趋于长条状发育

且随冻融循环次数的增加

土壤孔隙连通性增强

面积孔隙率增加; 宏观层面上表现为土壤大团聚体向微团聚体的迁移转化

土壤团聚体水稳定性下降。(2)土壤初始含水率增加会导致冻融循环过程中土壤团聚体破坏程度增强

且在7次冻融循环内呈显著性变化; 随着土壤初始含水率的增高团聚体面积孔隙率呈显著增加趋势。(3)土壤团聚体面积孔隙率与平均重量直径MWD和几何平均直径GMD呈显著负相关

面积孔隙率的增加分别解释了MWD和GMD变化率的49.1%和50.3%。

Abstract

The change of soil structure under freeze-thaw cycles is one of the main reasons for the aggravation of soil erosion on black soil slope during snowmelt period. The stability and microstructure of soil aggregates are the key factors affecting soil erodibility. Based on the controlled freezing and thawing simulation experiment

the dynamic characteristics of the microstructure of black soil aggregates during the freeze-thaw cycles were analyzed by using the wet sieving method

scanning electron microscopy (SEM) and Image Pro Plus (IPP) analysis. Moreover

the interaction between the water stability and the microstructure characteristics of soil aggregates was elucidated. The results showed that: (1) The destructive effect on soil aggregate stability was found during the freezing and thawing cycles. At the micro level

the freeze-thaw cycles derived soil pores to develop into long strips. With the increase of freeze-thaw cycles

the connectivity of soil pores and the area porosity increased. On the macro level

it showed that soil macro aggregates migrated to micro aggregates

and the water stability of aggregates decreased. (2) The increase of soil initial water content would enhance the damage degree of soil aggregate under freeze-thaw cycles

and there was a significant change within seven freeze-thaw cycles. With the increase of soil initial water content

the aggregate area porosity increased significantly. (3) Aggregate area porosity was significantly correlated to the mean weight diameter (MWD) and the geometric mean diameter (GMD). The increase of area porosity could explain 49.1% and 50.3% of MWD and GMD

respectively.

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references

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