摘要
【目的】研究区域性天然次生阔叶混交林林分组成与空间结构特征,为林分空间结构的优化调整奠定理论基础,指导优化与调节森林空间结构,以获得最佳林分空间分布结构,达到森林经营管理的理想结构目的。【方法】以远安县典型天然次生阔叶混交林为研究对象,布设5个30 m×30 m的固定样地,采用全面调查分析法。对树种组成、林分直径分布、密集度、混交度、大小比和角尺度5个林分空间结构参数进行测定分析,为该区域天然林结构的优化调整提供理论依据和技术支持。【结果】1)样地调查乔木层物种13科22属31种,林分主体为落叶阔叶混交林生态群落;林木径级株数分布遵从异龄林型。2)各树种密集度频率值分布在0.75~1.00之间,平均密集度为0.98。3)各树种平均混交度频率值为0.55~1.00,平均混交度频率值为0.79。4)各树种的平均胸径大小比平均频率分布在0.25~0.92之间,平均胸径大小比值为0.5。5)各树种平均角尺度值分布在0.13~0.54之间,综合平均角尺度值为0.48。【结论】该区域天然次生阔叶混交林群落物种组成丰富,结构复杂,树种组成搭配复杂,林分组成以壳斗科阔叶混交林为代表的优势树种占主体地位和生态空间;林分直径分布符合天然林径级特征;林分处于比较密集与很密集水平之间,为强度混交,混交状况较好,种群隔离程度较高;各树种空间大小分化和大小组合存在差异,既占优势也有受压,整体林分处于中庸和优势状态;天然次生阔叶混交林因树种不同,分布格局而不同,随机、团状、均匀并存,林分分布格局整体呈现随机分布。
【Objective】To study the composition and spatial structure characteristics of regional natural broad-leaved mixed forest,and lays a theoretical foundation for the optimization and adjustment of stand space structure,guide the optimization and adjustment of spatial structure of forest,so as to obtain the best distribution structure of forest and achieve the ideal structure of forest management.【Method】Taking the typical natural broad-leaved mixed forest in Yuan’an county as the research object,five fixed plots of 30 m×30 m were laid,and the comprehensive survey method was used to investigate the forest property values of the DBH≥5 cm in the plot.For tree species,Stand diameter distribution,crowding degree,mingling degree,neighborhood comparison and uniform angle index determination and analysis of spatial parameters of five forest stands.It provides theoretical basis and technical support for the optimization and adjustment of natural forest structure in this area.【Result】The sample plot investigated the tree layer species 13 families 22 genera 31 species,The main stand is the ecological community of deciduous broad-leaved mixed forest;The number distribution of diameter trees in different age trees was different.The frequency value of tree species density was 0.75-1.00,The average density was 0.98.The average mixing frequency of each tree species ranges from 0.55 to 1.00,The average frequency of mixing degree is 0.79.The distribution of the average DBH ratio of each species ranged from 0.25 to 0.92,The average DBH ratio was 0.5;The average angular scale value of each tree species was 0.13-0.54,and the comprehensive mean angular scale value was 0.48.【Conclusion】the community of deciduous broad-leaved mixed forest in this region is rich in species composition,complex in structure,and complex in composition and combination of tree species.The dominant tree species represented by the broad-leaved mixed forest of fagaceae occupy the dominant position and ecological space.The stand diameter distribution was in line with the characteristics of natural forest diameter.Stands are between relatively dense and very dense levels,Is strength mixing,mixed state is good,population isolation degree is high;The spatial size differentiation and size combination of different tree species are different,which are both dominant and under pressure.Broadleaved mixed forest is different in distribution pattern due to different tree species,which is random,clubby and even.
作者
何见
肖正利
陈卫军
刘粉粉
陈玉萍
敬顺华
HE Jian;XIAO Zhengli;CHEN Weijun;LIU Fenfen;CHEN Yuping;JING Shunhua(Central South Forest Inventory&Planning Institute of National Forestry&Grassland Administration of China,Changsha 410014,Hunan,China;Forestry Bureau of Yuan’an County,Yichang 444200,Hubei,China;College of Life Science&Technology,Central South University of Forestry&Technology,Changsha 410004,Hunan,China)
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2020年第8期7-16,共10页
Journal of Central South University of Forestry & Technology
基金
“十三五”国家重点研发计划项目(2016YFD06006005)
湖北省第五次森林资源普查项目(YAZ0126-201801-01F)。
关键词
阔叶混交林
林分组成
空间结构
森林资源普查
远安县
broad-leaved mixed forest
stand composition
spatial structure
forest resources survey
Yuan’an county
