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EFFECT OF PLANT ROOT SYSTEM ON SOIL ANTI-EROSION(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

Issue:
1997 02
Page:
119-124
Research Field:
Articles
Publishing date:

Info

Title:
EFFECT OF PLANT ROOT SYSTEM ON SOIL ANTI-EROSION
Author(s):
Wu Yan1 Liu Shiquan2 Wang Jingxi3
1. Chengdu Institute of Biology, Academia sinica, Chengdu 610041;
2. Sichuan Agriculture University, Yaan, Sichuan 625014;
3. Sichuan Research Institute of Forestry, Chengdu 610081
Keywords:
root systemsoil anti-erosionwater and soil conservationupper and middle reaches of the Yangtze River
CLC:
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PACS:
DOI:
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DocumentCode:

Abstract:
Using inherent characteristics of soil which determines soil anti-erosion as indexes, the mechanism and degree of soil anti-erosion by plant root system was investigated with some common forests for water and soil conservation in the upper and middle reaches of the Yangtze River. The resultS indicated that the root system could improve soil anti-erosion by means of fine roots (d≤1mm),and the mechanism might be that the secretion was supplied by living roots and organic matters provided by dead roots served as adhesives,which made the waterstable aggregate of three kinds of particle grades (d>7mm, d=7-5mm, d=5-3mm) increase in quantity. They could not only increase total porosity of soil, but also improve the anti-disperibility and stability of structure and porosity. Thus,the saturated osmotic coefficient of soil was enhanced. Compared with the soil without plants, the relation between the improving value (y) of physicochemical characteristics for soil which indicated soil anti-erosion and the fine root (d≤1mm) biomass in forest soil obeyed the linear eqution: y=a+bRw. Relevant regression models were established and the effects of root systems in different fored types were compered in this paper.

References

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Last Update: 1900-01-01