小浪底库区群落演替过程中土壤机械组成及碳库变化研究

本文采用空间代替时间的方法,通过对黄河小浪底库区不同恢复阶段土壤机械组成及碳库变化分析,结果表明:(1)各植被恢复阶段,土壤风化度上层高于下层;从裸地到乔木阶段,土壤风化度逐渐增大,土壤的发育逐渐成熟,从草本到乔木阶段,随着进展演替,对土壤的形成及发育作用依次升高;(2)各植被恢复阶段,土壤有机碳含量及碳密度随着土层深度增加而减少;随着进展演替,土壤有机碳含量及碳密度逐渐增加。相关分析表明,土壤粘粒与有机碳含量呈显著正相关关系。

Analysis on soil mechanical composition and organic carbon stock of successional sequence in the Xiao langdi Reservoir Area

The paper adopts the method of spatial sequence instead of time successional sequence,studies on mechanical composition and organic carbon stock of successional sequence in the Xiao langdi Reservoir Area.The results showed that:(1) In different restoration stages,the soil weathering in topsoil is more serious than that in subsoil.the soil weathering is ascending and soil developing is mature from bare land to arbor restoration stage.The soil quality is better as succession proceeded.(2) In different restoration stages,Soil organic carbon content and organic carbon density are decreasing with soil depth increasing,though they are increasing as succession proceeded.Moreover,Analysis shows that clay in soil is positively correlated to organic carbon content.