Influence of Grassland Ecosystems Shift on Soil Organic Carbon in the Karst Mountain Area of Guizhou Province

doi:10.11733/j.issn.1007-0435.2015.04.010

Acta Agrestia Sinica ›› 2015, Vol. 23 ›› Issue (4): 733-737.DOI: 10.11733/j.issn.1007-0435.2015.04.010

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Influence of Grassland Ecosystems Shift on Soil Organic Carbon in the Karst Mountain Area of Guizhou Province

Yang Feng¹, Tang Wen-han², Wang Jian-li¹, Yao Hong-yan¹, Cheng Wei¹, Liu Hong-lai¹

1. College of Animal Sciences, Guizhou University, Guiyang, Guizhou Province 550025, China;
2. The Committee on Agriculture of Qiandongnan State, Kaili City, Guizhou Province 556000, China

Received:2014-10-28 Revised:2015-03-27 Online:2015-08-15 Published:2015-08-26

贵州喀斯特山区草地生态系统类型转变对土壤有机碳的影响

杨丰¹, 唐文汉², 王建立¹, 姚红艳¹, 程巍¹, 刘洪来¹

1. 贵州大学动物科学学院, 贵州贵阳 550025;
2. 贵州省黔东南州农业委员会饲草饲料站, 贵州凯里 556000

通讯作者: 刘洪来
作者简介:杨丰(1988-),男,贵州思南人,硕士研究生,主要从事草地生态学方面研究,E-mail:fengygzu@163.com
基金资助:
贵州省科技厅项目(黔科合NY字[2012]3011号)(黔科合J字[2012]2162号)(黔科合J字[2014]2055号);贵州省优秀科技教育人才省长专项基金项目(黔省专合字[2011]39号);国家自然科学基金项目(31101751);贵州大学研究生创新基金项目(研农2015028)资助

Abstract

Abstract:

The influence of land use shift on soil organic carbon was investigated in karst ecological fragile using paired design method with the grassland and their corresponding reclaimed farmland under different altitudes in Guizhou Province as the research object. The results showed that soil volume mass in studied area was significantly raised with the soil depth increasing (P <0.05), the amplification was 17.85%～45.74%. The soil volume and mass increased significantly after the grassland was transferred into farmland, and the amplification was 5.09%～10.88%. The soil organic carbon content significantly decreased with the soil depth increasing, and the soil surface (0～10 cm) organic carbon content was 54.93% in studied area(0～50 cm), which appeared enrichment in surface soil. The shift on grassland ecosystem resulted in organic carbon content in the studied area decreased significantly, the decline was 19.64%～57.12%, and increased with altitude increasing. The grassland was transferred into farmland, which caused the density of soil organic carbon decreased, and the decline was 12.22%～50.73%. The study results provided references for a further understanding of ecosystem shift to global carbon cycle and regional land use.

Key words: Karst mountain area, Elevation gradient, Ecosystem change, Grassland conversion, Soil organic carbon, Change characteristics

摘要：

为探明喀斯特生态脆弱区土地利用方式转变对土壤有机碳的影响,以贵州省不同海拔梯度下的草地及其相应开垦的农田为研究对象,采用成对设计的方法研究了不同海拔梯度下草地、农田的有机碳特征及草地生态系统类型转变对土壤有机碳的影响。结果表明:研究区草地、农田土壤体积质量随土层深度增加显著升高(P <0.05),增幅为17.85%～45.74%,草地转变为农田后土壤体积质量均显著增加,增幅为5.09%～10.88%。研究区草地、农田土壤有机碳含量随土层深度的增加而显著降低,表层(0～10 cm)土壤有机碳含量占整个研究区(0～50 cm)的54.93%,呈表层富集现象。草地生态系统类型转变导致整个研究区土壤有机碳含量显著下降,降幅为19.64%～57.12%,且降幅随着海拔高度的增加而增大;草地转变为农田使土壤有机碳密度下降,降幅12.22%～50.73%。

关键词: 喀斯特山区, 海拔梯度, 生态系统转变, 草地开垦, 土壤有机碳, 变化特征

CLC Number:

S812.2

Yang Feng, Tang Wen-han, Wang Jian-li, Yao Hong-yan, Cheng Wei, Liu Hong-lai. Influence of Grassland Ecosystems Shift on Soil Organic Carbon in the Karst Mountain Area of Guizhou Province[J]. Acta Agrestia Sinica, 2015, 23(4): 733-737.

杨丰, 唐文汉, 王建立, 姚红艳, 程巍, 刘洪来. 贵州喀斯特山区草地生态系统类型转变对土壤有机碳的影响[J]. 草地学报, 2015, 23(4): 733-737.

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Influence of Grassland Ecosystems Shift on Soil Organic Carbon in the Karst Mountain Area of Guizhou Province

贵州喀斯特山区草地生态系统类型转变对土壤有机碳的影响

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