榆阳区不同植被类型土壤有机碳含量及其影响因素  

Soil organic carbon content and its influencing factors of different vegetation types in Yuyang District

作　　者：南正正 艾宁 刘长海[1] 史嘉豪[1] 刘广全 NAN Zhengzheng;AI Ning;LIU Changhai;SHI Jiahao;LIU Guangquan(College of Life Sciences/Shaanxi Regional Biological Rsources Conservation and Utilization Engineering Research Center,Yan'an University,Yan'an,Shaanxi 716000,China;China Institute of Water Resources and Hydropower Research,Beijing 100038,China)

机构地区：[1]延安大学生命科学学院/陕西省区域生物资源保育与利用工程技术研究中心,延安716000 [2]中国水利水电科学研究院,北京100038

出　　处：《生态科学》2024年第5期169-174,共6页Ecological Science

基　　金：国家自然科学基金项目(32060297,31370541);国家重点研发计划课题(2016YFC0501705);延安大学揭榜制项目(2023JBZR-20)。

摘　　要：榆阳区森林生态系统处于新时期植被建设的初级演替阶段,研究其不同植被类型下土壤有机碳储存的变化特征及影响因素,有利于森林生态系统恢复和土地的合理利用。以榆阳区5种典型植被为研究对象,测定不同土层有机碳含量,探讨不同植被类型在0—100 cm土壤有机碳储存特征及其与土壤环境因子的关系。(1)不同植被类型下,土壤有机碳平均含量表现为油松林(5.62 g·kg^(–1))>樟子松林(4.13 g·kg^(–1))>侧柏林(3.44 g·kg^(–1))>沙棘林(2.75 g·kg^(–1))>草地(1.37 g·kg^(–1)),油松林与侧柏林、沙棘林、草地土壤有机碳平均含量呈显著性差异(P<0.05)。(2)不同植被类型土壤有机碳储量介于21.08 t·hm^(–2)—76.16 t·hm^(–2)。(3)土壤有机碳含量和土壤理化性质的相关关系在各植被中表现不一,综合5种植被类型来看,有机碳含量与电导率呈极显著正相关(P<0.01),与总孔隙度和饱和含水量均呈显著正相关(P<0.05)。榆阳区不同植被类型下有机碳的储存特征具有差异性,电导率、总孔隙度和饱和含水量显著影响林地土壤有机碳积累。The forest ecosystem in Yuyang District is in the primary succession stage of vegetation construction in the new period.The study of the change characteristics and influencing factors of soil organic carbon storage under different vegetation types is conducive to the restoration of forest ecosystems and the rational use of land.Taking five typical vegetation in Yuyang District as the research object,the content of organic carbon in different soil layers was measured,and the storage characteristics of soil organic carbon in 0-100 cm of different vegetation types and their relationship with soil environmental factors were discussed.(1)Under different vegetation types,the average content of soil organic carbon was Pinus tabulaeformis forest(5.62 g·kg^(–1))>Pinus sylvestris forest(4.13 g·kg^(–1))>Platycladus orientalis forest(3.44 g·kg^(–1))>Hippophae rhamnoides forest(2.75 g·kg^(–1))>grassland(1.37 g·kg^(–1)),The average content of soil organic carbon in Pinus tabulaeformis forest was significantly different from that in Platycladus orientalis,Hippophae rhamnoides forest and grassland(P<0.05).(2)The soil organic carbon storage of different vegetation types ranged from 21.08 t·hm^(–2) to 76.16 t·hm^(–2).(3)The correlation between soil organic carbon and soil physical and chemical properties was different in various vegetations.From the perspective of the five types of vegetation,organic carbon and electrical conductivity were extremely significantly positively correlated(P<0.01),which was related to total porosity and total porosity.The saturated water content was significantly positively correlated(P<0.05).The storage characteristics of organic carbon under different vegetation types in Yuyang area were different,and the electrical conductivity,total porosity and saturated water content significantly affect the accumulation of soil organic carbon in woodland.

关 键 词：土壤有机碳 植被类型 分布特征 影响因素 通径分析 

分 类 号：S714.2[农业科学—林学]