湘东大围山不同海拔带土壤溶解性有机碳含量

发布时间：2019-04-18 12:27

【摘要】：为了解土壤溶解性有机碳(DOC)含量在中山海拔带上的分异规律,选取亚热带湘东大围山花岗岩风化物发育的典型土壤垂直带谱:红壤、黄壤、黄棕壤和灌丛草甸土(亚类),挖掘土壤剖面深至母质层/母岩,研究海拔和土层深度对DOC含量的影响。结果表明,土壤剖面DOC含量介于9~5326 mg·kg-1,表土(A层)和底土(A层以下)DOC含量均随海拔升高而升高。土壤有机碳(SOC)、水分变化可以解释DOC含量的垂直带分异规律。DOC/SOC介于0.8%~34.9%,无明显的高度带现象,且DOC/SOC峰值大多出现在底土层。在同一海拔带,发育深厚的典型黄壤DOC含量和DOC/SOC均在底土中较高,发育较浅的黄壤性土则相反。本研究表明,表土和底土C含量及组成呈现不同的垂直带分异规律,山地海拔带上土壤C库研究应重视深层底土。
[Abstract]:In order to understand the variation of soil dissolved organic carbon (DOC) content in the altitudinal zone of Zhongshan, the typical soil vertical bands of granitic weathering in sub-tropical Hunan Province were selected: red soil, yellow brown soil and scrub meadow soil (subclass), and the vertical zone spectrum of granite weathering in sub-tropical Hunan Province was as follows: red soil, yellow brown soil and shrub meadow soil. The effects of altitude and depth of soil layer on DOC content were studied by digging the depth of soil profile to parent layer / parent rock. The results showed that the content of DOC in the soil profile was between 9 and 5326 mg kg-1, topsoil (layer A) and the content of DOC in subsoil (below layer A) increased with the increase of altitude. The variation of water content of soil organic carbon (SOC),) could explain the vertical band differentiation of DOC content. The ratio of DOC / SOC was between 0.8% and 34.9%, and there was no obvious height zone phenomenon, and the peak value of DOC/SOC appeared mostly in the subsoil layer. In the same altitude zone, the DOC content and DOC/SOC content of the typical yellow soil with deep development are higher in the subsoil, but the opposite is in the shallow yellow loam soil. The results show that the C content and composition of the topsoil and the subsoil are different in vertical zone, and the deep subsoil should be paid attention to in the study of the soil C pool in the mountain elevation zone.
【作者单位】：湖南农业大学资源环境学院;
【基金】：湖南省自然科学基金项目(13JJ4066) 湖南省教育厅科研优秀青年项目(15B110) 国家大学生创新创业训练计划项目(G(S)CX1410)资助
【分类号】：S153.6

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