Effects of Thinning on Biomass and Species Diversity Of understory in Chinese Fir Plantations

27 Mar Effects of Thinning on Biomass and Species Diversity Of understory in Chinese Fir Plantations

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Abstract

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)。

English Abstract

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 (P<0.05), while effects of thinning on species evenness was insignificant (P>0.05); 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(P<0.05); 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 (P<0.05).