Soil Profile Characteristics During Grassland Degeneration and Desertification in the Northwest of Sichuan Province

WANG Yan; YANG Jian-hong; PAN Jie; LI Zhe

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Soil Profile Characteristics During Grassland Degeneration and Desertification in the Northwest of Sichuan Province

- Soil Profile Characteristics During Grassland Degeneration and Desertification in the Northwest of Sichuan Province
- Bulletin of Soiland Water Conservation Vol. 28, Issue 1, Pages: 92-95(2009)
- 作者机构：
  
  1. 天津市农业资源与环境研究所,天津,300192
  2. 西南大学,重庆,400716
  3. 天津市公路工程总公司,天津,300250
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2009
- 稿件说明：
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WANG Yan, YANG Jian-hong, PAN Jie, et al. Soil Profile Characteristics During Grassland Degeneration and Desertification in the Northwest of Sichuan Province[J]. Bulletin of Soiland Water Conservation, 2009, 28(1): 92-95.
DOI：

WANG Yan, YANG Jian-hong, PAN Jie, et al. Soil Profile Characteristics During Grassland Degeneration and Desertification in the Northwest of Sichuan Province[J]. Bulletin of Soiland Water Conservation, 2009, 28(1): 92-95. DOI：

摘要

对川西北草原不同退化程度土壤的剖面特征和理化性质进行了研究。结果表明

随着退化程度的加大

土壤剖面的草甸层变薄

植被覆盖度降低

优良牧草种类和数量逐渐减少。土壤有机质和腐殖酸呈下降趋势

土壤的富胡比呈上升趋势。在土壤养分变化中

土壤的全氮、碱解氮、全磷、有效磷、有效钾含量均呈下降趋势

各土壤养分含量在剖面上的分布次序为:表层>亚表层>底层。全钾含量略呈上升趋势

但整体变化不大。土壤的pH值也略呈上升趋势

表层土壤pH值小于亚表层。

Abstract

The paper focused on the soil profile characteristics and soil physico-chemical properties of different degradation grades in the northwest of Sichuan Province.Results showed that the meadow layer of soil profile became smaller

vegetation coverage was declined

and good pasturage was gradually decreased in variety and quantity with increased steppe degradation grades.The contents of organic matter and humic acid showed a downtrend and meanwhile

FA/HA increased gradually.Among soil nutrient substances

the contents of total nitrogen

available nitrogen

total phosphorus

available phosphorus

and available potassium showed a declined tendency.The content of total potassium showed a slight uptrend

but the change was not obvious.Soil pH value also showed a slight uptrend and the pH value of surface layer was less than the value of subsurface layer.

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