亚热带常绿阔叶林枯立木与冠层结构的关系
Relationship between distribution of snags and canopy structure of subtropical evergreen broad-leaved forest
张璐 1敬小丽 1苏志尧 1蔡琳颖 1张星元1
作者信息
- 1. 华南农业大学林学与风景园林学院, 广东广州510642
- 折叠
摘要
冠层结构影响着林下光环境的变化进而影响林木的生长.以亚热带常绿阔叶林10hm 2固定样地内枯立木为研究对象,运用样方调查法和半球面影像技术,量化枯立木多度、 胸径、 分布与冠层结构的关系.结果表明,样地内枯立木以小树为主,胸径和树高均偏小;枯立木多度随林冠开度、 林下总光照、 林下散射光和林下直射光的增加而减小;而枯立木胸径随林冠开度、 林下总光照和林下直射光的增加而增大;林下光照在枯立木的形成中发挥重要的作用.枯立木集中分布在林下光照较弱且林冠开度较小的区域,枯立木的多度和胸径受林下直射光影响较大,而枯立木的分布则主要受到了林下散射光和总光照的影响.
Abstract
Forest canopy structure effects understory environment factors and then affects tree growing .Base on plot survey and hemispherical photography technology, the abundance, diameter at breast height(DBH), distribution of snag and its controlling factors were studied to explore the formation and maintenance mechanism of community biodiversity of subtropical evergreen broad-leaved forest in the 10 hm2 permanent plot.The result showed that the snags mainly consist of small trees which the DBH and height were relatively small.Abundance of snags decreased with increasing canopy openness (CO), transmitted total light (Ttot), transmitted diffused light ( Tdif) and transmitted direct light (Tdir ) while DBH of snags increased with increasing CO, Ttot, and Tdir.Understory light played an important role in the formation of snags.The snags prefer to cluster together under the habitat with weak understory light and small CO.The abundance and DBH of snags were affected by Tdir while the distribution of snags were closely related to Tdif and Ttot.
关键词
枯立木/林下光照/半球面影像/典范对应分析/林冠层Key words
snag/understory light/hemispherical photography/canonical correspondence analysis/canopy layer引用本文复制引用
基金项目
广东省自然科学基金(2015A030313403)
广东省省级林业发展及保护专项资金林业科技创新项目(2017KJCX037)
出版年
2018
国家科技期刊平台
NSTL
维普
万方数据