Distribution Characteristics of Soil Cementing Material and Its Effect on Loess Macro-aggregate Stability

WANG Zilong1; HU Feinan1; 2; ZHAO Yonggang3; ZHAO Shiwei1

doi:10.13870/j.cnki.stbcxb.2016.05.055

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Distribution Characteristics of Soil Cementing Material and Its Effect on Loess Macro-aggregate Stability

更新时间：2025-03-12

- Distribution Characteristics of Soil Cementing Material and Its Effect on Loess Macro-aggregate Stability
- Vol. 30, Issue 5, Pages: 331-336(2016)
- 作者机构：
  
  1. 中国科学院水利部水土保持研究所，陕西杨凌,712100
  2. 西北农林科技大学水土保持研究所，陕西杨凌,712100
  3. 山西师范大学生命科学学院,山西,临汾,041004
  4. 华中农业大学资源与环境学院,武汉,430070
  5. 北京市水科学技术研究院,北京,100048
  6. 西北农林科技大学资源环境学院，陕西杨凌,712100
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2016.05.055
  CLC： S152.4
- Published：2016
- 稿件说明：
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WANG Zilong1, HU Feinan1, 2, et al. Distribution Characteristics of Soil Cementing Material and Its Effect on Loess Macro-aggregate Stability[J]. 2016, 30(5): 331-336.
DOI：

WANG Zilong1, HU Feinan1, 2, et al. Distribution Characteristics of Soil Cementing Material and Its Effect on Loess Macro-aggregate Stability[J]. 2016, 30(5): 331-336. DOI： 10.13870/j.cnki.stbcxb.2016.05.055.

摘要

通过对子午岭林区顶级植被辽东栎群落0—100 cm土层有机无机胶结物质含量与类型、土壤大团聚体稳定性进行野外调查采样与室内测定，对胶结物质含量与分布及其对大团聚体稳定性的影响进行了研究，探讨了不同胶结物质对大团聚体稳定性的影响。结果表明：（1）土壤有机碳和碳酸钙含量在剖面上呈现出完全相反的分布规律。有机碳含量随土层的增加而降低，其中0—20 cm土层中有机碳含量显著高于20—100 cm土层；而碳酸钙含量随土层的增加而增加，其中20—100 cm土层中碳酸钙含量显著高于0—20 cm土层。土壤黏粒含量随土层加深逐渐增加，但总体上变化不明显。（2）土壤大团聚体稳定性随土层的加深而降低，其中在20—70 cm土层中大团聚体稳定性随土壤深度的增加变化最为剧烈（与0—20 cm土层相比，破坏率增加了581.00%）。40—100 cm土层中大团聚体破坏率是0—20 cm土层中的7.25倍，表明表层大团聚体稳定性远远高于底层。（3）黄土大团聚体稳定性的提高主要取决于土壤有机碳含量。而在有机碳组分中，矿物结合态有机碳对大团聚体稳定性的提高起最直接作用。研究结果揭示了黄土主要胶结物质在土壤剖面中的分布特征，明确了矿物结合态有机碳是直接影响黄土大团聚体稳定性最强烈的胶结物质

这为培育良好土壤结构体提供了一定的科学依据。

Abstract

In order to investigate the influence of different cementing materials on the stability of macro-aggregate

this study investigated the content and types of organic and inorganic cementation material and macro-aggregate stability in the 0—100 cm soil profile of Quercus wutaishansea community in the Ziwuling forest region by field investigation and laboratory test

and analyzed the relationships between distribution of cementing material and its effect on macro-aggregate stability. The results showed: (1) Organic carbon and calcium carbonate showed completely opposite distribution in profile

and the content of organic carbon decreased with soil depth

the content of organic carbon in 0—20 cm soil layer was significantly higher than that in 20—100 cm soil layers. The content of calcium carbonate increased with soil depth

and the content in the 20—100 cm was significantly higher than 0—20 cm soil layers. (2) The aggregate stability was decreasing with the soil depth. The 20—70 cm layer had the most dramatic changes (compared with the 0—20 cm soil layers

the destruction rate increased by 581.00%). The proportion of aggregates destruction of 40—100 cm soil layer was 7.25 times larger than that of 0—20 cm soil layer

so the aggregate stability of surface was significantly higher than the bottom. While the clay content increased gradually with the increase of soil depth

but the change was not obvious. (3) The improvement of macro-aggregate stability mainly depended on the content of soil organic carbon. Mineral-associated organic carbon had the most direct effect on the stability of macro-aggregates in the organic carbon fractions. The results of this study revealed the distribution characteristics of main cementing materials and made clear that the mineral bound organic carbon was the most powerful cementing material which had a direct impact on the stability of the macro-aggregate of the loess. It provided a scientific basis for the cultivation of fine aggregate structure.

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