Changes of Soil Physical and Chemical Properties in Sandy Desertification on the Duolun Prairie

ZHU Zhi-mei; YANG Chi; CAO Ming-ming; LIU Ying-ru; LIU Mei-ling

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Changes of Soil Physical and Chemical Properties in Sandy Desertification on the Duolun Prairie

- Changes of Soil Physical and Chemical Properties in Sandy Desertification on the Duolun Prairie
- Bulletin of Soiland Water Conservation Vol. 26, Issue 1, Pages: 1-5(2007)
- 作者机构：
  
  1. 西北大学环境科学系,陕西,西安,710069
  2. 内蒙古大学生命科学学院生态与环境科学系,内蒙古,呼和浩特,010021
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2007
- 稿件说明：
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ZHU Zhi-mei, YANG Chi, CAO Ming-ming, et al. Changes of Soil Physical and Chemical Properties in Sandy Desertification on the Duolun Prairie[J]. Bulletin of Soiland Water Conservation, 2007, 26(1): 1-5.
DOI：

ZHU Zhi-mei, YANG Chi, CAO Ming-ming, et al. Changes of Soil Physical and Chemical Properties in Sandy Desertification on the Duolun Prairie[J]. Bulletin of Soiland Water Conservation, 2007, 26(1): 1-5. DOI：

摘要

以典型生态脆弱区内蒙古多伦县为例

连续2 a进行了沙漠化对土壤理化性质的影响研究。结果表明

随着草原沙漠化的加剧

(1)土壤颗粒组成发生变化

黏粒含量趋于减少

砂粒增多。不同粒径对土壤团粒结构形成和保水保肥的贡献不同

黏粒的减少抑制了土壤的膨胀、可塑性及离子交换等物理性质。(2)土壤含水量下降。上层(0-20 cm)土壤含水量下降明显

随着沙漠化梯度的增加

表层土壤含水量下降速度加快

从而深层土壤含水量逐渐高于表层。(3)土壤容重呈上升趋势。容重的增加必然影响土壤中水分和空气的移动及植物根系的发育。不同深度的土壤容重与草原沙漠化也存在一定的关系

潜在阶段深土层(30-50 cm)的容重最小

而严重阶段表土层(0-5 cm)容重最小。(4)土壤有机质

N含量下降

方差分析显示各沙漠化梯度间均差异极显著。且土壤N的衰减要快于C。土壤C/N比呈增加趋势

说明伴随着土壤C

N的显著下降

质地变粗

植物N素供应不足更为突出。(5)土壤容重与土壤全N

C及黏粒含量的相关分析表明

细颗粒物多

有机质含量高

土壤容重即小

从而有助于提高土壤的稳定性

且5-10 cm土层的性质表现突出。(6)土壤的颗粒组成状况与土壤营养元素之间有着同增同减性

但黏粒与N的关系要密切于黏粒与C和C

N间的关系。因此土壤中细颗粒物的减少会导致N素的衰减十分明显

从而导致土壤稳定性降低。

Abstract

This paper studied changed properties of soils in the typical ecotone of Duolun County

Inner Mongolia for two years.Results showed that the content of clay decreased with increased sandy desertification on grassland.Soil moisture decreased significantly

especially within 20 cm of the soil surface(P0.05).Soil moisture in deeper layers was higher than the upper.Soil bulk density was found to increase with depth and has a certain correlation with the degree of sandy desertification in different depths.Soil bulk density in the 30-50 cm layer was the lowest in Ⅱ stage

and in the 0-5 cm layer

the lowest in Ⅴ stage.The contents of organic matter(OM)

carbon(C) and nitrogen(N) in soils decreased significantly(P0.001).The reduction in nitrogen was more rapid than carbon

which led to an increase in the C/N of soil.This indicted that the nitrogen supplying to plant was insufficient.The positive correlation between granular composition and nutrient elements was significant.The correlation between clay and N was similar to those between clay and C and between C and N.Therefore the reduction in fine particles resulted in the significant reduction in N.The correlations among soil bulk density and the contents of carbon

nitrogen and clay showed that the finer particle

the higher content of organic matter and the lower soil bulk density.This indicted an improvement in soil stability

especially in the 5-10 cm layer(P0.001).

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