摘要
以江西省吉安市闽楠天然次生林为研究对象。通过标准地调查数据,分析其更新层树种组成及其重要值;运用扩散系数法结合二项分布指数和聚块性指数,分析更新层的空间分布格局。结果表明:更新层共计33种乔木树种,闽楠更新占优势;更新层林分密度以及闽楠密度均随高度级、地径级增大而降低,更新层林分密度分别与地径和高度的关系呈线性关系,决定系数分别为0.758 5和0.812 9;更新层树种空间分布总体上呈聚集分布状态,聚集强度由大到小顺序为:闽楠、丝栗栲、木荷、绒毛润楠;随高度级增大,更新层树种分布整体上表现为聚集向随机分布转变,而闽楠则未表现出明显的变化规律。
With the data of sample plot investigation in Ji’an Country of Jiangxi Province,forest regeneration layer plant species composition,important value and spatial distribution patterns of seedling and sapling were analyzed by the diffusion coefficient method in combination with binomial distribution index and polychrome index in natural secondary Phoebe bournei forest.The 33 species of tree plants were counted and the dominance species was P.bournei in regeneration layer.Density of all the tree species and P.bournei sapling and seedling presented a decreasing trend with the increase of the height classes and the ground diameter classes.The relationship between ground diameter and height of all the tree species and P.bournei sapling and seedling showed a linear relationship with the coefficient of determination was 0.758 5 and 0.812 9,respectively.The spatial distribution pattern of all the tree species was aggregated with the descending order of Phoebe bournei,Castanopsis fargesii,Schima superba,and Machilus velutinawas.With the increase of the height classes spatial distribution pattern of all the sapling and seedling,aggregated distribution transferred to random distribution,but the spatial distribution pattern of P.bournei sapling and seedling didn’t present clear regularity.
作者
李雪云
潘萍
欧阳勋志
臧颢
宁金魁
国瑞
占常燕
Li Xueyun;Pan Ping;Ouyang Xunzhi;Zang Hao;Ning Jinkui;Guo Rui;Zhan Changyan(Forestry and Livestock Bureau of Xinghua,Xinghua 225700,P.R.China;Jiangxi Agricultural University)
出处
《东北林业大学学报》
CAS
CSCD
北大核心
2018年第9期11-15,共5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(31360181)
关键词
闽楠
天然次生林
天然林更新
林分密度
Phoebe bournei
Natural secondary forest
Regeneration characteristics
Spatial distribution
