Characteristics of Soil Organic Carbon Density in Degraded Achnatherum Splendens Communities Around Qinghai Lake

CAO Sheng-kui; CHEN Ke-long; CAO Guang-chao; ZHU Jin-fu; LU Bao-liang

doi:10.13961/j.cnki.stbctb.2014.02.016

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Characteristics of Soil Organic Carbon Density in Degraded Achnatherum Splendens Communities Around Qinghai Lake

- Characteristics of Soil Organic Carbon Density in Degraded Achnatherum Splendens Communities Around Qinghai Lake
- Bulletin of Soiland Water Conservation Vol. 33, Issue 2, Pages: 73-77(2014)
- 作者机构：
  
  1. 青海师范大学生命与地理科学学院,青海,西宁,810008
  2. 青海师范大学青海省自然地理与环境过程重点实验室,青海,西宁,810008
  3. 中国科学院寒区旱区环境与工程研究所,甘肃,兰州,730000
  4. 中国科学院青海盐湖研究所,青海,西宁,810000
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2014.02.016
  CLC：
- Published：2014
- 稿件说明：
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CAO Sheng-kui, CHEN Ke-long, CAO Guang-chao, et al. Characteristics of Soil Organic Carbon Density in Degraded Achnatherum Splendens Communities Around Qinghai Lake[J]. Bulletin of Soiland Water Conservation, 2014, 33(2): 73-77.
DOI：

CAO Sheng-kui, CHEN Ke-long, CAO Guang-chao, et al. Characteristics of Soil Organic Carbon Density in Degraded Achnatherum Splendens Communities Around Qinghai Lake[J]. Bulletin of Soiland Water Conservation, 2014, 33(2): 73-77. DOI： 10.13961/j.cnki.stbctb.2014.02.016.

摘要

通过对环青海湖区退化芨芨草群落的土壤容重和有机碳含量的测定分析

确定了退化芨芨草群落的土壤碳密度特征。结果显示

重度退化芨芨草群落的土壤容重显著大于中度退化芨芨草群落的土壤容重。重度退化芨芨草群落土壤有机碳含量普遍低于中度退化芨芨草群落

特别是两者表层土壤有机碳含量差异极为显著(p

0.001)。在0-100 cm剖面上

中度退化芨芨草群落土壤有机碳含量总体呈减少趋势

重度退化的则呈现减少和先增加后减小的两种变化趋势。芨芨草群落土壤有机碳密度跟有机碳含量变化趋势一致;芨芨草群落土壤有机碳主要集中在0-30 cm土层

中度和重度退化下该深度土壤有机碳密度分别为7.35和2.92 kg/m

占整个剖面有机碳密度的57.45%和63.06%;环青海湖区中度和重度退化芨芨草群落剖面土壤有机碳密度为12.79和4.63 kg/m

。

Abstract

Based on measurements of soil bulk density and organic carbon content

this paper studied the characteristics of soil organic carbon density in degrading Achnatherum splendens communities around the Qinghai Lake. Results showed that soil bulk density under the heavily degraded Achnatherum splendens communities was apparently greater than that in the moderately degraded communities. Soil organic carbon content in the moderately degraded Achnatherum splendens communities was generally higher than that in the heavily degraded. Especially

there existed an extreme apparent difference in surface soil organic carbon content between them. In the 0-100 cm soil profile

soil organic carbon content showed a decreasing trend in the moderately degraded Achnatherum splendens communities and however

the heavily degraded communities displayed two kinds of trend

i.e.

decreasing trend and the trend of first increasing and then decreasing with soil depth. Soil organic carbon density showed the same trend as its content. Soil organic carbon was mainly distributed in the 0-30 cm soil layer. Soil organic carbon densities in the layer in the moderately and heavily degraded Achnatherum splendens communities were 7.35 and 2.92 kg/m2

respectively

occupying 57.45% and 63.06% of the total soil organic carbon densities in the whole soil profile. In the profiles

soil organic carbon densities in the moderately and heavily degraded Achnatherum splendens communities around the Qinghai Lake were 12.79 and 4.63 kg/m2

respectively.

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