An Analysis on Physicochemical Characteristics of Crust in Loess Soil on Slope Farmland

WU Fa-qi; FAN Wen-bo

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An Analysis on Physicochemical Characteristics of Crust in Loess Soil on Slope Farmland

- An Analysis on Physicochemical Characteristics of Crust in Loess Soil on Slope Farmland
- Bulletin of Soiland Water Conservation Vol. 20, Issue 4, Pages: 22-24(2001)
- 作者机构：
  
  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：
  CLC：
- Published：2001
- 稿件说明：
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WU Fa-qi, FAN Wen-bo. An Analysis on Physicochemical Characteristics of Crust in Loess Soil on Slope Farmland[J]. Bulletin of Soiland Water Conservation, 2001, 20(4): 22-24.
DOI：

WU Fa-qi, FAN Wen-bo. An Analysis on Physicochemical Characteristics of Crust in Loess Soil on Slope Farmland[J]. Bulletin of Soiland Water Conservation, 2001, 20(4): 22-24. DOI：

摘要

在实验和对比分析的基础上

讨论了黄土善土结皮的一些主要物理化学性质特征。结果认为

结皮的形成是以细砂和粗粉砂为骨架

以小于 0.01mm的细小颗粒填塞土壤空隙的一个物理过程

其腐殖质含量几乎与土壤相同

而碳酸钙含量则略低。结皮的坚实度与前期含水率呈负相关

与容重和厚度呈正相关

而容重与厚度间的关系较为复杂。

Abstract

Based on experiments and comparing analysis

the physicochemical characteristics of crust above the loess soil is discussed mainly

and some results were obtained. Crust formation is a physical process that the framework formed by fine sand and coarse silt is filled by small grain(< 0.01mm). The content of humus is nearly same as that of soil while the content of CaCO3 is slightly lower. Crust hardness has negative relation with the water content of earlier stage

and has positive relation with bulk density and thickness. The relat ion of bulk density and thickness is more complicated.

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references

Onofiok O,Singer M J. Scanning electron microscope studies of surface crusts formed by simulated rainfall[J].Soil Sci.Soc.Am. J.,1984,48:1138-1143.

Ahmad N,Robilin A J. Crusting of river state soil in Trinidad and its effect on gaseous diffusion,percolationand seeding emerg emce[J].Soil Sci.J.1971,22:23-31.

Farres P.The role of time and aggregate size in the crusting process[J].Earth Surface Processes.1985,3: 243-254.

Hussain S M,Smillie G W,Couins J F.Laboratory studies of crust development in Irish and Iragi Soil.1. Moisture content, penetration resistance, aggreate size and seeding emergence of spring barly[J].Soil and Tillage Research.1985,5: 33-35.

张光远,蔡崇法.黄绵土结皮的微形态特征及某些理化性质的研究[C].见:晋西黄土高原土壤侵蚀规律实验研究文集.北京:水利电力出版社, 1990.

蔡国强.表土结皮在溅蚀和坡面侵蚀过程中的作用[C].黄河粗泥沙来源及侵蚀产沙机理研究文集.北京:气象出版社,1988.

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