应用生态学报2017，Vol.28Issue(10)：3181-3188,8.DOI:10.13287/j.1001-9332.201710.001
林分结构对桂西南蚬木种群天然更新的影响
Effects of forest structure on natural regeneration of Excentrodendron hsienmu population in Southwest Guangxi, China
摘要
Abstract
The effects of forest vertical structural variables (crown index,tree height,and large and small tree proportions) and density variables (basal area,adult tree density,shrub density,shrub coverage,and Excentrodendron hsienmu proportion in the forest canopy) on the natural regeneration of the typical E.hsienmu populations in the karst mountains of Southwest Guangxi,China were studied.The results showed that the average regeneration density of E.hsienmu populations was 1742-3861 trees · hm-2 and relatively low.Forest vertical structure and density variables did not significantly affect the number of E.hsienmu seedlings,but significantly affected seedling ground diameter and height to some extent.Among the vertical structure variables,a significant negative correlation was observed between crown index and seedling height,but the association between crown index and seedling ground diameter was not significant.The large tree proportion and tree height were significantly negatively correlated with both seedling ground diameter and height.However,the proportion of small trees was significantly positively related to both seedling ground diameter and height.Among the density variables,adult tree density showed a significant positive correlation with both seedling ground diameter and height.A significant negative association was observed between the proportion of E.hsienmu and seedling ground diameter.Multiple regression analysis indicated that the model based on stand structure factors showed a poor fitness with regard to the number of E.hsienmu seedlings (P＞0.05),and the quantitative distribution of E.hsienmu seedlings was affected to some extent by vertical structural variables.The stand structure factor model fitted well for the diameter and height of the seedlings (P＜0.01).Seedling ground diameter was mainly affected by adult tree density,and seedling height was mainly determined by the combined effects of adult tree density and basal area.关键词
垂直结构/密度因素/幼苗更新/喀斯特山地Key words
vertical structure/density factor/seedling regeneration/karst mountain引用本文复制引用
欧芷阳,庞世龙,谭长强,郑威,何琴飞,申文辉..林分结构对桂西南蚬木种群天然更新的影响[J].应用生态学报,2017,28(10):3181-3188,8.基金项目
本文由广西优良用材林资源培育重点实验室开放课题(1480101)、广西科技计划项目(桂科AB16380300)和广西林业科技项目(桂林科字[2014]02号)资助 This work was supported by the Open Research Fund of Guangxi Key Laboratory of Superior Timber Trees Cultivation(1480101),the Guangxi Science and Technology Plan Project (AB16380300),and the Guangxi Forestry Science and Technology Project([2014] 02). （1480101）
