间伐强度对云杉人工林下植物多样性的影响研究

Effects of Thinning Intensity on Diversity of Undergrowth Vegetation and Renovation in Artificial Spruce Forest

调查了云杉人工林间伐后和未间伐的林分生长、林下植物种类、数量、盖度、高度,采用物种丰富度、Shannon-Wiener指数、Simpson指数和Pielou均匀度指数进行了多样性分析,以探讨间伐强度对云杉人工林下植物多样性的影响。结果表明:随着间伐强度的增大,保留木的生长显著优于对照区;林下植物种类、数量显著增加;不同间伐强度林下植物种类的多样性、丰富度、生物量、盖度、显著高于对照区,且随间伐强度的增强而增大,以重度间伐(<450株/hm2)最为显著(灌木层多样性除外)。

A survey was condue ted on species, quantity, coverage and height of undergrowth vegetation and growth conditions of seedling in artificial spruce forest. Effect of thinning intensity on the biodiversity of undergrowth vegetation was studied by species richness, Shannon-Wiener index, Simpson index and Pielou index. The resuhs showed that the reserve wood growth was better than the control （without thinning）; the species and quantity of under- growth vegetation in artificial spruce forest were increased gradually with increasing thinning intensity. The species richness, diversity, biomass and coverage of undergrowth vegetation in the thinned stands were also higher than those in the control, and the heavy thinned stands （〈450 stems/hm2） exhibited the highest species richness, diversity , biomass and coverage （ excepted diversity of shrub）.