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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。
In order to understand the variation of soil dissolved organic carbon (DOC) content in Zhongshan, we selected the typical vertical soil profiles of the weathered granites in the Daweishan area in the eastern part of the subtropical zone: red soil, yellow soil, yellow brown soil and shrubs Meadow soil (sub-category), excavation of the soil profile as deep as the parent material / parent rock, study the impact of altitude and soil depth on the DOC content. The results showed that the content of DOC in the soil profile ranged from 9 to 5326 mg · kg-1, and the DOC content in topsoil (A) and subsoil (A) increased with the increase of altitude. Soil organic carbon (SOC) and water change can explain the vertical band differentiation of DOC content. The DOC / SOC ranged from 0.8% to 34.9%, with no apparent height banding, and most DOC / SOC peaks appeared in the subsoil. In the same altitude, DOC and SOC of DOC and DOC / SOC of the typical deep yellow soil with high development are higher in the subsoil, while the yellow soil with the lighter development is the opposite. The study shows that C content and composition of topsoil and subsoil present different vertical band differentiation law. The research on soil C pool in mountainous elevation should pay attention to deep subsoil.