| 摘要: |
| 【目的】探讨不同间伐强度对马尾松(Pinus massoniana)人工林植被物种多样性的影响，为确定合理的间伐强度提供理论依据。【方法】以马尾松人工林为对象，设间伐强度分别为弱度（间伐株数比例为20%）、中度（间伐株数比例为40%）和强度（间伐株数比例为60%），以未间伐为对照，间伐5年后对马尾松人工林植被的物种多样性进行调查和分析。【结果】与对照相比，强度、中度和弱度间伐林分的植物种类分别增加15，17和15种，其中灌木种类增加14，13和12种，草本种类增加1，4和3种。强度与中度间伐林分的共有种最多，为23种，相似系数最大，为0.657 1；中度间伐林分与对照的共有种最少，为11种，相似系数最小，为0.343 8。间伐显著提高了林下植物的Margalef物种丰富度、Simpson指数和Shannon-Wiener指数（P<0.05），生态优势度指数则呈相反变化趋势(P<0.05)；均匀度Pielou指数（Jsi）仅在强度间伐林分的灌木层和草本层得到显著提高(P<0.05)。【结论】间伐对马尾松人工林植被物种多样性的影响显著，中度间伐最有利于林下物种多样性的提高。马尾松人工林经营密度宜为1 410株/hm2。 |
| 关键词: 马尾松人工林 间伐强度 物种多样性 林下植被 生态优势度 |
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| 基金项目:国家林业公益性行业科研专项(201104075)；国家“973”重点基础研究发展计划项目(2012CB416904) |
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| Effects of thinning on understory species diversities of Pinus massoniana forests |
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| Abstract: |
| 【Objective】This study focused on the effects of different thinning intensities on understory species diversities of Pinus massoniana forest.【Method】Effects of different thinning intensities stands on understory species diversities were investigated and analyzed in P.massoniana forest after being thinned for 5 years.Four kinds of treatments were set up with different thinning intensities,including light (thinning intensity of 20%),middle (thinning intensity of 40%),heavy (thinning intensity of 60%) and control without thinning.【Result】Compared with the control,the results indicated that heavy,middle and light thinning increased plant species by 15,17 and 15,respectively,within which shrub species increased by 14,13 and 12,whilst herb species increased by 1,4 and 3,respectively.The maximum number of common plants (23) and similarity coefficient index (0.657 1) were between heavy and middle thinning intensities and the lowest number (11) and similarity coefficient index (0.343 8) were between middle thinning intensity and control.Thinning significantly increased the species abundance,species richness indexes,Simpson indexes and Shannon-Wiener indexes of understory (P<0.05).In contrast,the ecological dominance index was decreased (P<0.05).The heavy thinning markedly increased the species evenness Pielou index (Jsi),for both the shrub layer and the herb layer (P<0.05).【Conclusion】The middle thinning has obvious effect on the understory plant diversity of P.massoniana forest,so the reasonable stand density of P.massoniana forest is 1 410 tree/hm2. |
| Key words: Pinus massoniana plantation thinning intensity species diversity understory ecological dominance |
