间伐对马尾松天然次生林林下植物多样性的影响  

The effects on the diversity of undergrowth plant of the natural secondary forest of Pinus massoniana by thinning

作　　者：唐效蓉[1] 徐清乾[1] 蒋秀文 

机构地区：[1]湖南省林业科学院,湖南长沙410004 [2]桂阳县林业局,湖南桂阳423300

出　　处：《湖南林业科技》2012年第1期5-9,共5页Hunan Forestry Science & Technology

基　　金：国家林业局行业攻关项目(199703)

摘　　要：选择12和14地位指数的2种立地的林分,分别设置6种和5种保留密度,对间伐4年后的23年生马尾松天然次生林林下植物多样性进行研究。结果表明:马尾松天然次生林林下植物种数随着林分保留密度的增大,12和14地位指数的林分均表现为由逐渐增加至一个峰值后逐渐减少;适宜的保留密度有利于提高林下植物的多样性,12和14地位指数林分的植物多样性分别以保留密度130株/667 m2和100株/667 m2的样地为最优;随着林分密度与冠层郁闭度的增大,林下植物类型有由阳性植物为主向中性与荫性变化的趋势,而形成阳性、中性及荫性共存的多态性植物群落;适宜的保留密度有利于提高林下植物的生物量和植被总盖度,12和14地位指数林分的林下植物生物量和植被总盖度分别以保留密度130株/667 m2和90株/667 m2的样地为最佳;2种地位指数不同保留密度林分的林下枯落物自然风干重、枯落物层厚及腐殖质层厚差异均不显著,而林下地被物鲜重和植被总盖度则均表现为差异极显著。Based on selection of the two kinds forest stand that 12 and 14 site indexes with set five to six reserved density, the diversity of undergrowth plant of the natural secondary forest with the 23 years old trees of Pinus mo^oniana after thinning four years were ana- lyzed. The results showed that： The numbers Of the of undergrowth plant of the natural secondary forest of P. massoniana were in- creased with forest stand reserved density increasing. The forest stand of 12 and 14 site indexes were both decreased followed by in- creased after a peak value. The suitable reserved density can improve the diversity of undergrowth plant. The best forest stand reserved density for diversity of 12 and 14 site indexes were 130 plants per 667 m2 and 100 plants per 667 m2 respectively. Along with the in- crease of forest stand density and crown density of canopy, the underground plants types were turn light-demanding plant type to neutro- philous plants and shade-demanding plants type. The suitable reserved density also can increase the biomass and total cover-degree of undergrowth plant. The best forest stand reserved density for the biomass and total cover-degree of 12 and 14 site indexes were 130 plants per 667 m2 and 90 plants per 667 m2 respectively, There is no significant difference in the air dry weight, thickness of withers and falls thing, and thickness of humus in the different forest stand reserved densities of two kinds of site indexes. And there is signifi- cant difference in fresh weight of ground flora and total cover-degree of underground plant in the different forest stand reserved densities of two kinds of site indexes.

关 键 词：马尾松 天然次生林 间伐 植物多样性 保留密度 

分 类 号：S791.248[农业科学—林木遗传育种]