摘要
为探究不同密度柏木(Cupressus funebris)人工林的林分空间结构与林下植被物种多样性的关系,以太子山柏木人工林为研究对象,根据Voronoi图确定林分空间结构单元,分析不同密度柏木人工林灌草层物种组成和多样性,利用灰色关联分析林分空间结构与灌草层物种多样性的关系。结果表明,低密度林分(标准地1)角尺度和混交度高于高密度林分,且竞争指数降低,开敞度增大。4个标准地中,乔木、灌木和草本植物共133种,隶属59科107属。柏木幼树和幼苗在灌木层具有绝对优势,草本层优势种为耐荫和中性物种。灌木层的Shannon-Weiner指数、Simpson指数和Pielou指数高于同一密度林分的草本层。影响灌木层物种多样性的主要林分空间结构指数为角尺度;影响草本层物种多样性的主要林分空间结构指数为竞争指数。林分密度差异影响柏木人工林的林分结构、林下植被组成和物种多样性。林分密度为1000株/hm^(2)时更有利于柏木人工林林下植被的生长发育和物种多样性的稳定。
In order to explore correlation between stand spatial structure and understorey species diversity of Cupressus funebris plantations with different densities,taking C.funebris plantations in Taizishan as research objects,species composition and diversity of shrub and herb layers of C.funebrisin plantations with different densities were analyzed with stand spatial structure units determined by Voronoi diagram.Correlation between stand spatial structure and species diversity was analyzed by grey correlation degree.Results showed that uniform angle and mingling intensity of low-density stand were higher than those of high-density stand,competition index decreased and degree of openness increased.There were 133 species of trees,shrubs and herbs,belonging to 107 genera and 59 families.Young trees and seedlings of C.funebris were absolutely dominant species in shrub layer.Shade-tolerant and neutral species were dominant in herb layer.Shannon-Weiner index,Simpson index and Pielou evenness index of shrub layer were higher than those of herb layer.Main factor affecting species diversity of shrub layer was Wi.Main factors affecting species diversity of herb layers was CLi.Difference in stand density affected stand structure,understory vegetation composition and species diversity of C.funebris plantation.When density was 1000 plant/hm^(2),it was beneficial for growth and development of understorey vegetation and stability of species diversity of C.funebris plantation.
作者
毛燕
林虎
孙林山
谢经荣
江腾宇
汪洋
Mao Yan;Lin Hu;Sun Linshan;Xie Jingrong;Jiang Tengyu;Wang Yang(Hubei Ecology Polytechnic College,Wuhan,Hubei 430200,China;Hubei Taizishan Forest Farm Administration,Jingshan,Hubei 431819,China;Central South Inventory and Planning Institute of National Forestry and Grassland Administration,Changsha,Hunan410014,China)
出处
《广西林业科学》
2021年第6期639-645,共7页
Guangxi Forestry Science
基金
中德财政合作林业重大项目(zdczhz2021ky09)
中德技术合作林业重点科研课题(zdjshz2021ky06)。
关键词
林分空间结构
物种多样性
柏木人工林
stand spatial structure
species diversity
Cupressus funebris plantation
