安徽农业科学2018，Vol.46Issue(1)：108-112,5.
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
摘要
Abstract
[Objective] To test whether there is a significant effect of broad-leaved trees on the spatial distribution of moso bamboo's biomass,[Method] A 30 m × 30 m 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 ＞ 5 cm in the study region on the cases.[Result] At all given distance scales from 0 to 8 m,cases exhibit a Poisson random distribution.There were two species of broad-leaved trees (Celtis sinensis Pers.and Ulmus 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 distances 0 to 6.1 m from the point source,and the farmost influence distance slightly went far beyond 15 m.[Conclusion] Although broad-leaved tree(s) can significantly affect the spatial distribution of moso bamboo's 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Key words
Binary regression/Case-control/Maximum likelihood estimate/Point-source modelling/Risk elevation function分类
农业科技引用本文复制引用
宋伙林,许顾巍,吴毅,董丽娜,时培建..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[J].安徽农业科学,2018,46(1):108-112,5.基金项目
国家自然科学基金青年基金项目(31400348) （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). （LYSX[2016]04）
