应用空间点格局分析方法研究阔叶树对毛竹生物量的影响  

Apply the Spatial Point Pattern Analysis Methods to Examine the Effect of Broad-leaved Trees on Moso Bamboo's Biomass

作　　者：宋伙林 许顾巍 吴毅 董丽娜 时培建[1] SONG Huolin;XU Guwei;WU Yi(Co-Innovation Center for the Sustainable Forestry in Southern China, Bamboo Re-search;Administrative Bureau of Dr. Sun Yat-sen's Mausoleum, Nanjing Jiangsu 210014)

机构地区：[1]南方现代林业协同创新中心,南京林业大学竹类研究所,江苏南京210037 [2]中山陵园管理局,江苏南京210014

出　　处：《安徽农业科学》2018年第1期108-112,共5页Journal of Anhui Agricultural Sciences

基　　金：国家自然科学基金青年基金项目(31400348);江苏高校优势学科建设工程项目;江苏省林业三省工程项目(LYSX[2016]04)

摘　　要：[目的]检验阔叶树是否会对临近毛竹生物量的空间分布具有显著性影响。[方法]调查江苏南京紫金山一块30 m×30 m的毛竹林地,根据毛竹胸径大小划分出案例组(胸径最大的前1/4部分)和对照组(余下部分),使用空间点格局分析方法探索案例组的空间分布类型;同时,调查样地内胸径超过5 cm阔叶树的种类和数量,将其视作点源,使用点源模型分析它们对案例组的空间分布是否具有显著性影响,并估算阔叶树的影响距离范围。[结果]在给定的距离尺度内(0~8 m),案例组毛竹呈现出泊松随机分布,样地内阔叶树有朴树和榔榆2种,每种各2棵,发现榔榆对大胸径毛竹(即案例组)的空间分布具有显著性影响,而距离样地中心较近的榔榆对案例组影响程度(P<0.01)强于靠近样地边缘的榔榆(0.01<P<0.05),最强影响距离为0~6.1 m,然后快速递减,影响的最大距离可达15 m。[结论]虽然有的阔叶树对毛竹胸径的空间分布具有显著性影响,但并非所有阔叶树都有影响,暗示在竹阔混交的经营模式中,必须合理安排阔叶树的种类、数量和布局。[Objective]To test whether there is a significant effect of broad-leaved trees on the spatial distribution of moso bamboo5s biomass,[Method]A30m x30m quadrat of moso bamboo forest with sparse broad-leaved trees was investigated.The diameter of breast height(DBH)for every bamboo was measured and its spatial location was recorded in the two-dimensional Cartesian coordinate system.The DBHs of bamboo were sorted in a decreasing order into two groups:the first quartile of bamboo in this sequence were defined as cases,and the remaining bamboo were defined as controls.The point pattern analysis method was used to explore the spatial distribution pattern of cases on the background of controls,and the point-source modelling was used to examine of the effect of broad-leaved trees with DBH>5cm in the study region on the cases.[Result]At all given distance scales from0to8m,cases exhibit a Poisson random distribution.There were two species of broad-leaved trees(Celtis sinensis Pers.and U l m u s parvifolia Jacq)in the study region,each with two individuals.We found that U.parvifolia could significantly affect the spatial distributions of cases,whereas C.sinensis had no significant influence on them.The individual of U.parvifolia near to the center of the quadrat had stronger influence(P<0.01)than that near to the edge of the quadrat(0.01<P<0.05).The strongest influence of U.parvifolia occured in the distances0to6.1m from the point source,and the farmost influence distance slightly went far beyond15m.[Conclusion]Although broad-leaved tree(s)can significantly affect the spatial distribution of moso bamboo5s biomass,not all tree species have such a significant effect.It indicates that in the future practical forest management for the mixture operation between broad-leaved trees and moso bamboo we need reasonably arrange species,quantity and pattern of broad-leaved trees in moso bamboo forests.

关 键 词：二项回归 案例-对照 极大似然估计 点源模型 风险增强函数 

分 类 号：S795[农业科学—林木遗传育种]