福建明溪丝栗栲天然次生林物种多样性分析

Species diversity analysis of natural secondary forest of Castanopsis fargesii in Mingxi, Fujian

[目的]探讨不同干扰强度下丝栗栲天然次生林的物种多样性,为天然次生林的保护和培育提供依据。[方法]以物种丰富度指数、香农-威纳指数和Pielou均匀度指数为主要指标,分析了以丝栗栲为优势树种的天然次生林(TCK处理)及轻度干扰(TCR处理)、强度干扰(TCQ处理)林分的物种多样性变化。[结果]3种处理乔木层和灌木层物种丰富度指数依次为:TCK处理>TCR处理>TCQ处理,其中TCR和TCQ处理乔木层物种丰富度指数分别比TCK处理降低29.1%和63.6%;灌木层丰富度指数分别比TCK处理降低55.3%和74.5%。乔木层香农-威纳指数依次为:TCK处理(2.917)>TCR处理(2.633)>TCQ处理(1.784);灌木层依次为:TCK处理(2.941)>TCR处理(2.450)>TCQ处理(1.525)。乔木层和灌木层Pielou均匀度指数依次为:TCR处理>TCK处理>TCQ处理。[结论]丝栗栲天然次生林物种多样性高,林分较稳定,具有较强的生态功能。

[Purpose] The species diversity of natural secondary forest of Castanopsis fargesii under different disturbance intensity was explored to provide a basis for the protection and cultivation of natural secondary forest. [Method] Based on species richness index, Shannon-Wiener index, and Pielou evenness index, the species diversity of natural secondary forest(TCK treatment), weak interference(TCR treatment), and intensity interference(TCQ treatment) with dominant species of C.fargesii were analyzed. [Result] The species richness index of tree layer and shrub layer in the three treatments was as follows: TCK>TCR>TCQ. Among them, the species richness index of tree layer in TCR and TCQ treatments was 29.1% and 63.6% lower than that of TCK treatment, respectively. The index of shrub layer was 55.3% and 74.5% lower than that of TCK treatment, respectively. The Shannon-Wiener index of tree layer was: TCK(2.917)>TCR(2.633)>TCQ(1.784), and the index of shrub layer was: TCK(2.941)>TCR(2.450)>TCQ(1.525). The Pielou evenness index of tree layer and shrub layer was: TCR>TCK>TCQ, respectively. [Conclusion] Natural secondary forest of C.fargesii has higher species diversity, more stable forest stands, and stronger ecological functions.