不同斑块混交毛竹林林下灌木多样性研究  

Understory Shrub Diversity in Different Types of Mixed Bamboo-tree Forests

作　　者：陈霜霜[1] 顾琪[1] 秦鹏[1] 郭琳 王茹 郑笑[1] 洪为[1] 王福升[1] 

机构地区：[1]南京林业大学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

出　　处：《竹子学报》2016年第3期30-38,43,共10页Journal of Bamboo Research

基　　金：国家十二五科技支撑计划"竹子优良种质选育技术研究与示范"(2012BAD23B05);江苏高校优势学科建设工程项目

摘　　要：林下灌木是森林生态系统的重要组成,不仅能直接或间接影响养分的循环和乔木幼苗的更新,而且维护了林地土壤质量。从揭示斑块混交林下灌木多样性与土壤养分及上位乔木林分的相关关系的目标出发,以不同斑块混交毛竹林的林下灌木层植物群落作为研究对象,采用野外调查和室内分析相结合的方法,重点探究林下灌木多样性与土壤养分及距斑块交错带距离之间的关系。基于对福建省建瓯市3座不同斑块混交毛竹林样山的林下灌木多样性和土壤养分的调查,分析了各类型林下灌木多样性的差异,运用多元线性回归分析土壤养分及距斑块交错带距离对毛竹林林下灌木Shannon-Wiener多样性指数的影响。结果表明:研究区林下灌木种类丰富,共有112种,隶属于37科97属,优势种为木莓(Rubus swinhoei)、毛冬青(Ilex pubescens Hook.et Arn.)、流苏子(Coptosapelta diffusa)、矩叶鼠刺(Itea oblonga)、杜茎山(Maesa japonica)、山血丹(Ardisia punctata)和网脉酸藤子(Embelia rudis)等;不同斑块混交毛竹林林下灌木多样性存在显著差异,混交带的丰富度指数最高,Shannon-Wiener多样性指数据距斑块交错带距离呈先上升后下降的趋势;3座山土壤养分及水分存在显著的差异,有效磷和速效钾含量都属于缺乏水平;空间距离指标(距斑块交错带的距离D)均对三座山林下灌木的Shannon-Wiener指数影响显著,具有边缘效应。Understory shrubs are of importance for forest ecosystems because of their essential functions,affecting soil nutrient cycling and recruitment of tree seedlings directly or indirectly,and maintaining soil quality.In this study ,we focused on the relationship between the understory shrub diversity of different types of mixed bamboo-tree forests,and environmental factors such as soil nutrients and the distance to patchy ecotones.The objectives were to determine the relationship between the understory shrub diversity and the tree canopy.Based on the investigation of understory shrub diversity and soil nutrients in three types of mixed bamboo-tree forests,the effects of soil nutrients and the distance to cross zone between ecotones on Shannon-Wiener diversity index of the understory shrubs were examined by using multiple linear regression.The results showed that the understory shrub species were rather abundant in the study region,there found totally 112 species belonging to 37 families and 97 genera,and the dominant species were Rubus swinhoei,Ilex pubescens Hook.et Arn,Coptosapelta diffusa,Itea oblonga,Maesa japonica ,Ardisia punctata,and Embelia rudis.There were significant differences in understory shrub diversity among different types of mixed bamboo-tree forests.Richness in cross zone between ecotones was the highest of all,Shannon-Wiener index firstly increased and then decreased with increasing distance to the cross zone between ecotones.Soil nutrients and moisture were significantly different among the three mountains,and they were all short of potassium and phosphorus.The edge effects were demonstrated to be obvious for every mountain,such as its influence on the Shannon-Wiener index.

关 键 词：多元线性回归分析 丰富度指数 SHANNON-WIENER指数 土壤养分 

分 类 号：S718.5[农业科学—林学]