不同郁闭度华山松人工林林下灌木和草本多样性  

Diversity of Understory Shrubs and Herbs in Pinus armandii Plantation with Different Canopy Densities

作　　者：欧江 地地木古 张时林 简毅 王益志[3,5] OU Jiang;DIDI Mugu;ZHANG Shilin;JIAN Yi;WANG Yizhi(Ziyang natural resources and Planning Bureau,Ziyang 641300,China;Shimian natural resources and Planning Bureau,Ya’an 625400,China;Jinyang County Poverty Alleviation Comprehensive Support Team,Liangshan 616250,China;Sichuan Academy of Forestry Sciences,Chengdu 610081,China;Liangshan Branch of Sichuan Yangtze River State Forest Protection Bureau,Liangshan 615608,China)

机构地区：[1]资阳市自然资源和规划局,四川资阳641300 [2]石棉县自然资源和规划局,四川雅安625400 [3]金阳县脱贫攻坚综合帮扶工作队,四川凉山616250 [4]四川省林业科学研究院,四川成都610081 [5]四川省长江国有林保护局凉山分局,四川凉山615608

出　　处：《四川林业科技》2020年第6期56-63,共8页Journal of Sichuan Forestry Science and Technology

摘　　要：以金沙江流域22年生华山松人工林为研究对象,通过间伐、抚育修枝等方式形成郁闭度约为0.5、0.7、0.93个梯度,研究了不同郁闭度林分林下灌木和草本的物种组成和多样性变化特征。结果显示:(1)随郁闭度增大,植物种数减少;野拔子(Elsholtzia rugulosa),小叶杜鹃(Rhododendron parvifolium)、凤尾蕨(Pteris cretica),凉山悬钩子(Rubus fockeanus)、双盖蕨(Diplazium donianum)分别在0.5、0.7、0.9郁闭度林分中为优势植物,但重要值均不超过0.21;总体上高位芽植物比例最高,随郁闭度增大,占比最大的生活型分别为地下芽、高位芽、地面芽植物。(2)不同郁闭度林下植物的丰富度指数、Simpson指数、Shannon-Wiener指数差异显著,均随郁闭度增大而降低,0.5、0.7郁闭度显著高于0.9郁闭度。各郁闭度林下植物均匀度指数均不显著,灌木植物分布相对均匀。(3)0.5、0.7郁闭度共有种最多,0.7郁闭度与其他郁闭度林下物种相似系数均高于65%,林下植被群落结构较为稳定。The 22-year-old Pinus armandii plantation in Jinshajiang river basin was selected as the research object,and three gradients of canopy density of 0.5,0.7 and 0.9 were formed by thinning and pruning.The species composition and diversity of shrubs and herbs under different canopy density stands were studied.The results showed that:(1)The number of plant species decreased with the increase of canopy density.Elsholtzia rugulosa Rhododendron parvifolium,Pteris cretica,Rubus foceanus,and Diplazium donianum were the dominant plants in 0.5,0.7 and 0.9 canopy density respectively,but their important values did not exceed 0.21.In general,the proportion of high bud plants was the highest,and with the increase of canopy density,the life forms with the largest proportion were underground bud,high bud and ground bud plants.(2)The richness index,Simpson index and Shannon Wiener index of understory plants with different canopy density were significantly different,all of which decreased with the increase of canopy density.The canopy degrees of 0.5 and 0.7 were significantly higher than that of 0.9.The evenness index of understory plants was not significant,and the distribution of shrub plants was relatively uniform.(3)There were the most common species in 0.5 and 0.7 canopy density.The similarity coefficient of 0.7 canopy density and other canopy density was higher than 65%,and the community structure of the understory vegetation was relatively stable.

关 键 词：郁闭度 华山松 灌木 草本 植物多样性 

分 类 号：S718.5[农业科学—林学]