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作 者 ：闫明,钟章成,方兴

期 刊 ：生态学报 2005年 25卷 7期 页码：1642~1648

关键词：常绿阔叶林；片断；边缘效应；小气候；生物多样性；多元回归；

Keywords:evergreen broadleaved forest, edge effect, fragmentation, microclimate, biodiversity, regression,

摘 要 ：采用Simpson、Shannon-Wiener和Hill多样性指数以及逐步多元回归分析方法,在缙云山进行了植物群落调查、小气候观测和土壤肥力的测定以及各变量之间关系的分析。结果表明:片断常绿阔叶林物种多样性指数比连续常绿阔叶林低,不同生活型的表现不同;各片断阔叶林斑块边缘均存在明显的小气候边缘效应。随着斑块面积的减小,各斑块的ΔTa、林缘及林内ΔTs、林缘和林内ΔRH、林缘和林内Vmax、林缘和林内ΔPAR(正午)均呈增大的趋势。各斑块的小气候边缘效应,以最大斑块波及林内的深度最浅(约至林内15m)、最小斑块波及林内的深度最深(约至林内25m);常绿阔叶林物种多样性受林内外有效光合辐射(正午)差、气温日较差、土壤含水量、土壤有机质含量和土壤有效钾等因素的影响。

Abstract:Fragmented forest ecosystems change through time as a result of their isolation as well as other human and natural disturbances. Edge effects are differences in biotic or abiotic factors that exist along the borders of a habitat fragment relative to the interior environment. This study was designed to analyze how species diversity changes in different areas of fragmentation forests using the Simpson, Shannon-Wiener and Hill diversity indices; determine how key microclimatic variables change with increasing ...

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