摘要
为找出马尾松人工林最佳的抚育间伐强度,以12年生马尾松人工纯林为研究对象,通过定位观测,探讨了不同抚育间伐强度对林分生长、结构和林下植被的影响。结果表明:(1)随间伐强度的增加,胸径和单株材积增加,且处理间差异显著,而树高和单位面积蓄积量呈先增加后降低趋势,但处理间差异不显著。(2)不同径阶林木株数方差分析得出:除18,20,22三个径阶各处理间差异不显著外,其余各径阶处理间均差异极显著或显著。随间伐强度的增加,小径级木的径阶移动因子增大,进升上一径阶的株数增加,小径级木所占的比例逐渐减小,而林分中大径阶木的株数增多。(3)随间伐强度的增加,林下灌木、草本层的物种数、Simpson多样性指数、Shannon-Wiener多样性指数、丰富度和均匀度呈现先增后降的趋势,中度间伐的植物多样性指数最高,强度间伐反而降低。
In order to find out the optimum thinning intensity, the influences of thinning intensity on the stand-diameter structure, growth and the plants diversity were studied by selecting the planted Pinus massoniana pure forest of 12-year-old as tested objects. The results show that （1） The breast height and single tree volume increased with the increase of thinning, there was significantly different among thinning treatments. The tree height and the unit area stand volume increased first and then decreased, and there was no significantly different among thinning intensities.（2）The analysis on the trees number of different diameter classes indicated that differences were very significant or significant at various treatments except 18, 20, 22 three diameter classes. With the increases of thiuning intensity, the number of plant growth to larger diameter class increased, and the rate of smaller diameter class gradually declined. （3）With the increase of thinning intensity, the number of species, the Simpson index, the Shannon-Wiener index, richness and uniformity increased first and then decreased. Species diversity was highest at medium thinning, and it decreased with heavy thinning.
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2013年第3期30-33,46,共5页
Journal of Central South University of Forestry & Technology
基金
贵州省重大专项(黔科合重大专项字[2012]6011号)
贵州省林业重大专项(黔林科合[2010]重大03号)
贵州省人才基地建设项目(黔人颁发[2009]9号)
贵州省创新团队建设项目(黔科合人才团队2011)
贵州大学研究生创新基金(农科2012003)
关键词
马尾松
抚育间伐
径阶结构
物种多样性
Pinus massoniana
thinning
diameter class structure
species diversity
