【摘要】 研究了间伐强度对兴安落叶松林林下植物多样性和生物量的影响,为确定兴安落叶松林分的最佳采伐强度提供理论依据。以兴安落叶松林为研究对象,设置4种间伐强度(10%、20%、30%、40%)和对照的试验固定样地,对间伐5 a后各样地林下灌草多样性和生物量进行调查分析。结果表明:1)抚育间伐可以明显提高林下植物种类、Menhinick丰富度指数、Simpson指数、Shannon-Wiener指数和Pielou均匀度指数,各层均以40%间伐强度最大,而生态优势度指数则呈递减趋势(P <0.05);2)适当加大间伐强度对林分林下植被层和枯落物层生物量具有促进作用,均以间伐强度30%为优(P <0.05);3)综上所述,在30%～40%的间伐强度下,兴安落叶松林林下植被多样性和生物量最高,林分质量最佳。更多还原

【Abstract】 The effects of thinning intensity on plant diversity and biomass under Larix gmelinii forest were studied in order to provide a theoretical basis for determining the optimum cutting intensity of L.gmelinii forest. Taking the L.gmelinii forest as object, four thinning intensities(10%, 20%, 30%, 40%) and control plots were set up to investigate the shrub and grass diversity and biomass of different plots after 5 years of thinning. The results show that: 1) Thinning obviously increased the species of under-story plants, Menhinick richness index, Simpson index, Shannon-Wiener index and Pielou evenness index, the thinning intensity values of each undergrowth vegetation layers all reached the highest when with 40% thinning layers, while the ecological dominance index showed a decreasing trend(P <0.05). 2) Appropriate increase of thinning intensity promoted the biomass growth of plant layer and litter layer under forest, and 30%thinning intensity was the best(P < 0.05). 3) In conclusion, under 30%-40% thinning intensity, the undergrowth vegetation diversity and biomass of L. gmelinii forest were the highest, and the stand quality was the best.更多还原