摘要
以两种林分密度D1(1156株/h^(m2))和D2(820株/h^(m2))马尾松人工林为研究对象,探讨林地土壤有机碳含量及碳储量随林分密度的变化规律及其影响因素。结果表明,(0~60 cm)土壤有机碳含量和碳储量整体均表现为较高密度林分D1显著高于较低密度林分D2,D1的土壤有机碳含量和碳储量分别比D2增加了11.30%和15.78%。两种密度林分的土壤有机碳含量和碳储量主要集中在表土层(0~20 cm),具有表聚性特征,均随土层深度的增加呈下降趋势,表层土壤碳储量分配比例较高(52.31%~54.25%),表明林分密度对表层土壤有机碳含量有重要影响。D1和D2的土壤有机碳含量、土壤碳储量与土壤容重分别呈极显著和显著负相关。D1的土壤有机碳含量和土壤碳储量与土壤含水量和总孔隙度均呈极显著正相关,与土壤pH值呈显著正相关。D1和D2的土壤有机碳含量和土壤碳储量与全氮、全磷和有效磷含量相关性均不显著。相对D2而言,D1密度经营下林分可获得较高土壤碳储量,其土壤固碳能力更突出。适当提高林分密度对于增加中龄林分土壤碳储量有积极作用,是提升马尾松人工林土壤碳储量的重要途径。
Taking Pinus massoniana plantations with two stand densities D1(1156 plants/h^(m2))and D2(820 plants/h^(m2))as objects,changes of soil organic carbon content and carbon storage with stand density and influencing factors were explored.Results showed that(0-60 cm)soil organic carbon content and carbon storage were significantly higher in high density stand D1 than in low density stand D2 and soil organic carbon content and carbon storage in density D1 increased by 11.30%and 15.78%,respectively,than those in density D2.Soil organic carbon content and carbon storage of two density stands were mainly concentrated in topsoil layer(0-20 cm)with characteristic of surface polymerization,and showed decreasing trend with increase of soil depth.Proportion of soil carbon storage in topsoil was higher(52.31%-54.25%),which indicated that stand density had important effect on soil organic carbon content in topsoil.Correlations between soil organic carbon content,soil carbon storage and soil bulk density in D1 and D2 were extremely significant and significant negative,respectively.Soil organic carbon content and soil carbon storage in D1 were extremely significant positively correlated with soil water content and total porosity,and significant positively correlated with soil pH value.Soil organic carbon content and soil carbon storage in D1 and D2 were not significantly correlated with contents of total nitrogen,total phosphorus and available phosphorus.D1 stands could obtain higher soil carbon storage compared with D2,and its soil carbon sequestration capacity was more prominent.Appropriate increase of stand density had positive effect on increasing of soil carbon storage in middleaged stand and was an important way to improve soil carbon storage of P.massoniana plantations.
作者
李玉凤
李妹珍
马姜明
宋尊荣
莫燕华
杨章旗
陆绍浩
Li Yufeng;Li Meizhen;Ma Jiangming;Song Zunrong;Mo Yanhua;Yang Zhangqi;Lu Shaohao(Institute for Sustainable Development and Innovation,Guangxi Normal University,Guilin,Guangxi 541006,China;Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection,Ministry of Education,Guilin,Guangxi 541006,China;Guangxi Forestry Research Institute,Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation,Nanning,Guangxi 530002,China;Zhenlong Forest Farm,Hengxian,Guangxi 530327,China)
出处
《广西林业科学》
2021年第1期54-59,共6页
Guangxi Forestry Science
基金
广西创新驱动发展专项资金项目(桂科AA17204087-7)
桂林市科学研究与技术开发计划项目(20190205,20180107-3)
广西优良用材林资源培育重点实验室开放课题(2019-B-04-01)
广西研究生教育创新计划项目(XYCSZ2019081)。
关键词
土壤碳储量
林分密度
马尾松
碳含量
理化特性
soil carbon storage
stand density
Pinus massoniana
carbon content
physicochemical properties
