不同土地利用方式下土壤团聚体的分布及其有机碳含量的变化
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国家自然科学基金(40901138);四川省教育厅重点项目(07ZA059);四川省科技厅应用基础项目(2008JY0022);中国科学院山地灾害与地表过程重点实验室开放研究基金资助项目


Organic Carbon Change and Distribution of Soil Aggregates Under Different Land Uses
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    摘要:

    通过野外调查与室内分析相结合的方法,对耕地、园地、林地和撂荒地土壤团聚体及其有机碳的分布特点进行了研究。结果表明,不同土地利用方式下土壤团聚体的分布均以>2.00mm团聚体为主,其它依次为0.5~1,1~2,<0.25和0.25~0.5mm粒径的团聚体。林地和撂荒地土壤有机碳含量随粒径的减小呈递增的变化趋势;耕地在0.25~0.5mm和<0.25mm团聚体中有机碳含量较高,园地则以0.25~0.5mm粒径团聚体中有机碳含量最高。4种土地利用方式下,以>5mm团聚体中土壤有机碳含量差异最大,随着团聚体粒径的增加,它们之间的差异逐渐减小;各土地利用方式下表层土壤中,分布在<0.25mm和0.25~0.5mm团聚体粒径中有机碳占有机碳总量比例低于2~5,>5和0.5~1mm的团聚体。

    Abstract:

    Organic carbon change and distribution of soil aggregates were analyzed under different land uses such as arable,garden plots,woodland,and abandonment land by field investigation and indoor analysis.Results indicated that by the percentage,the size groups of soil aggregates were in the order of>5,2~5,0.5~1,1~2,<0.25,and 0.25~0.5 mm and by the organic carbon content,the size groups were in the order of>5,2~5,1~2,and 0.5~1 mm in the>0.5 mm size groups.In the <0.5 mm size groups,the organic carbon change was relatively complicated.The organic carbon content in arable land,woodland,and abandonment land was the highest in <0.25 mm fraction of soil aggregates.The organic carbon content in the garden plot was the highest in 0.25~0.5 mm fraction of soil aggregates.The difference was the largest in>5 mm fractions of soil aggregates among the four land uses and the difference decreased with the increasing aggregate size.Under different land uses,the proportion of the organic carbon and total organic carbon for the <0.25 and 0.25~0.5 mm soil aggregates was lower than that for 2~5,>5,and 0.5~1 mm soil aggregates.

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何淑勤,郑子成.不同土地利用方式下土壤团聚体的分布及其有机碳含量的变化[J].水土保持通报,2010,(1):7-10

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  • 收稿日期:2009-07-02
  • 最后修改日期:2009-08-24
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  • 在线发布日期: 2014-11-26
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