小兴安岭原始椴树红松林中幼龄林与成熟林土壤的理化性质

摘要

为评价小兴安岭不同森林植被类型对土壤碳氮库的影响,以小兴安岭原始椴树红松林成熟林和中幼龄林为研究对象,采样分析土壤总有机碳、全氮、磷、容重等土壤理化性质.结果表明:相同林龄条件下,随土层加深,椴树红松林成熟林和中幼龄林土壤容重增大,总孔隙度变小,土壤有机质、全氮、磷含量减少,但C/N、pH分布无规律性;不同林龄相同土层,中幼龄林的土壤有机质、全氮、磷略高于成熟林,且土壤有机质、全氮表层0～10 cm差异显著,10～20 cm、20～30 cm差异不显著;含磷量差异均不显著.土壤有机质与全氮、孔隙度呈极显著正相关(P＜0.01),与容重呈极显著负相关(P＜0.01),与碳氮比呈显著相关(P＜0.05),与pH、含磷量相关关系不显著.%The soil physical and chemical properties of original young and mature Tilia Pinus Koraiensis forest were analyzed to evaluate the effect of different forest vegetation types on carbonnitrogen pool of soil in Xiao Hinggan Mountains.Results:The soil volume weight of young and mature Tilia Pinus Koraiensis forest increases with increase of soil depth but their total porosity,organic matter,total nitrogen and phosphorus decrease with increase of soil depth.There is no regularity in distribution of C/N and pH.Soil organic matter,total nitrogen and phosphorus content of young forest is slightly higher than,mature forest at the same soil depth.There is an obvious difference in organic matter and total nitrogen content of soil with 0～10 cm depth between young and mature forest but no obvious difference in organic matter,total nitrogen and phosphorus content of soil with 10 ～20 cm and 20 ～ 30 cm depth between young and mature forest.The correlation analysis shows that soil organic matter is positively related to porosity and total nitrogen very significantly,negatively related to volume weight very significantly and related to carbon/nitrogen ratio significantly hut the correlations between soil organic matter and pH,phosphorus are not significance.