间伐对杉木人工林林下植被多样性及生物量的影响

对间伐了4年的杉木（Cunninghamia lanceolata（Lamb.）Hook.）人工林林下植被的生物量和生物多样性进行了调查和分析。结果表明：林下植被相似系数随着间伐强度增加而增加;间伐显著提高了林下植被的物种丰富度、Simpson指数、Shannon-Weiner指数和生物量（P〈0.05）,而对均匀度指数无显著影响（P〉0.05）;强度和中度间伐显著增加了灌木生物量,而草本生物量在弱度和中度间伐下显著增加（P〈0.05）;3种间伐强度均显著提高草本的物种丰富度、Simpson指数和Shannon-Weiner指数,而灌木的3种指数仅在强和中度间伐下得到显著提高（P〈0.05）。

Effects of thinning on biomass and species diversity of understory in Chinese fir plantations

The biomass and species diversity of understory for Chinese fir（Cunninghamia lanceolata（Lamb.）Hook.） plantation were investigated after thinning 4 years.The results indicated that with thinning intensity increasing,the similarity coefficient indexes increased;and species richness indexes、Simpson indexes、Shannon-Weiner indexes and biomass of understory increased significantly（P0.05）,while effects of thinning on species evenness was insignificant（P0.05）;both heavy thinning intensity and medium thinning intensity increased significantly the biomass of shrubs,and herbs biomass increased markedly under light thinning intensity and medium thinning intensity（P0.05）;the Richness indexes,Simpson indexes and Shannon-Weiner indexes of herbs increased significantly under three thinning intensities,but those indexes of shrubs only increased markedly under the heavy thinning intensity and medium thinning intensity（P0.05）.