不同演替阶段3种林型土壤有机碳密度及影响因素  

Soil Organic Carbon Density and Contributing Factors of Three Forest Types in Different Succession Stages

作　　者：刘学 梁素钰 王琪瑶 李云红 杜倩 LIU Xue;LIANG Suyu;WANG Qiyao;LI Yunhong;DU Qian(Heilongjiang Institute of Ecology/Heilongjiang Forest Ecology and Engineering Key Lab,Harbin 150081,Heilongjiang,China)

机构地区：[1]黑龙江省生态研究所/黑龙江省森林生态与林业工程重点实验室,哈尔滨150081

出　　处：《农学学报》2024年第6期18-23,共6页Journal of Agriculture

基　　金：黑龙江省省属科研院所项目“绿肥对采矿迹地植被与土壤养分的影响”(SCZ2023-01-08);黑龙江省省属科研院所项目“大兴安岭中域冻土活动层土壤碳储量空间格局研究”(CZKYF2022-1-C030);黑龙江省重点研发计划指导类项目“黑龙江省生态产品总值核算”(GZ20220117)。

摘　　要：研究不同演替阶段3种林型土壤有机碳积累特征,为评估东北原始林区土壤有机碳储量及碳汇管理提供理论依据。以相同坡位、不同林龄的椴树红松林成熟林、中幼龄林及次生杨桦林为研究对象,探讨3种林型土壤有机碳密度及活性有机碳分布特征,分析土壤有机碳密度与活性有机碳组分(可溶性有机碳、微生物量碳)、氮组分(速效氮)及容重等理化性质的相关性。结果表明:3种林型土壤有机碳密度均随土层的加深而降低,综合0~30 cm土层,次生杨桦林土壤有机碳密度最高[(17.11±1.13)kg/m^(2))];椴树红松林成熟林居中[(14.69±1.31)kg/m^(2)];椴树红松林中幼龄林最低[(12.06±1.26)kg/m^(2)],且三者之间差异显著。土壤有机碳密度与有机碳、可溶性有机碳、速效氮呈极显著正相关(P<0.01),与全氮、孔隙度、C/N呈显著正相关(P<0.05)。相对于椴树红松林,次生杨桦林更利于土壤有机碳固存。土壤有机碳、可溶性有机碳、速效氮极显著影响3种林型土壤有机碳积累;全氮、孔隙度、C/N显著影响土壤有机碳积累。To evaluate soil organic carbon storage and provide theoretical basis for carbon sink management,the study was conducted to detect the characteristics of soil organic carbon accumulation of the three forest types in different succession stages.Tilia Pinus Koraiensis of two different stages and secondary poplar birch forest in the same slope position were selected as the research objects.Soil organic carbon density(SOCD)and active organic carbon distribution characteristics of three types of forest soil were detected.The correlation between SOCD and soil organic carbon(SOC),dissolved organic carbon(DOC),microbial biomass carbon(MBC),total nitrogen(TN),available nitrogen(AN),bulk density(BD),as well as other basic properties were analyzed.The results showed that SOCD of the soil in three types of forest all decreased with the deepening of the soil layers.In the soil layer of 0-30 cm,SOCD of secondary poplar birch(SPB)was the highest[(17.11±1.13)kg/m^(2))];the mature forest of Tilia Pinus Koraiensis(MTP)was the middle[(14.69±1.31)kg/m^(2)];and the young forest of Tilia Pinus Koraiensis(YTP)was the lowest[(12.06±1.26)kg/m^(2)],and there were significant differences among the tree types(P<0.05).SOCD was marked highly significant positive correlation with SOC,DOC and AN(P<0.01),and significant positive correlated with TN,POR and C/N(P<0.05).Compared with the MTP and YTP,SPB was more conducive to the sequestration of soil organic carbon.SOC,DOC and AN had highly significant effect on SOCD;TN,POR and C/N had significant effect on SOCD.

关 键 词：椴树红松林 次生杨桦林 有机碳密度 相关 

分 类 号：S[农业科学]