闽楠天然次生林不同林层碳密度变化特征及其影响因素  

The Carbon Density Variation Characteristics of Different Forest Layers in the Natural Secondary Forest of Phoebe bournei and Its Influencing Factors

作　　者：游景晖 欧阳勋志[1] 李坚锋 毛述震 潘萍[1] You Jinghui;Ouyang Xunzhi;Li Jianfeng;Mao Shuzhen;Pan Ping(Key Laboratory of National Forestry and Grassland Administration for the Protection and Restoration of Forest Ecosystem in Poyang Lake Basin(Jiangxi Agricultural University),Nanchang 330045,P.R.China)

机构地区：[1]鄱阳湖流域森林生态系统保护与修复国家林业和草原局重点实验室(江西农业大学),南昌330045

出　　处：《东北林业大学学报》2024年第4期89-94,共6页Journal of Northeast Forestry University

基　　金：林业公益性行业科研专项(201504301);国家自然科学基金项目(32360389、32260392)。

摘　　要：以江西省安福县闽楠(Phoebe bournei)天然次生林为对象,根据2015、2018、2022年3期的固定样地调查数据及国际林联(IUFRO)林层划分标准,采用方差分析法分析不同林层碳密度及其变化量的差异,运用灰色关联分析法分析闽楠天然次生林不同林层碳密度变化量的主要影响因子。结果表明:2015—2022年间,主林层碳密度显著提高(P<0.05),但其增量呈减慢趋势;次林层碳密度提高且呈加快趋势;林下层碳密度下降且呈加快趋势;整个林分的碳密度显著提高且呈加快趋势。株数密度是影响主林层、次林层、林分碳密度变化的主导因子,坡度是影响林下层碳密度变化的主导因子。坡向、平均胸径对碳密度变化的影响较小。为持续提高闽楠天然次生林固碳能力,应适当采取人工干预手段,实施林分结构调整,改善幼苗幼树生长环境等经营措施,促进林分自然更新及其正向演替进程。Taking the natural secondary forest of Phoebe bournei in Anfu County,Jiangxi Province as the research object,based on the fixed plot survey data of three periods in 2015,2018,and 2022 and the International Union of Forest Research Organizations(IUFRO)forest layer classification standards,the analysis of the differences in carbon density and its changes in different forest layers using analysis of variance method.Using grey relational analysis method,the main influencing factors of carbon density changes in different forest layers of P.bournei natural secondary forest were analyzed.The results showed that from 2015 to 2022,the carbon density of the main forest layer significantly increased(P<0.05),but the increment showed a slowing trend.The carbon density of the secondary forest layer increased and showed an accelerating trend.The carbon density of the understory layer decreased and showed an accelerating trend.The carbon density of the entire forest stand significantly increased and showed an accelerating trend.The tree density was the dominant factor affecting the changes in carbon density of the main forest layer,secondary forest layer,and forest stand,while slope was the dominant factor affecting the changes in carbon density of the understory layer.Aspect and average diameter at breast height have a smaller impact on carbon density changes.In order to continuously improve the carbon sequestration capacity of P.bournei natural secondary forest,appropriate artificial intervention measures should be taken,forest structure adjustments should be implemented,and management measures such as improving the growth environment of seedlings and saplings should be carried out to promote natural regeneration of the forest stand and its positive successional process.

关 键 词：闽楠 天然次生林 林层 碳密度 

分 类 号：S757.2[农业科学—森林经理学]