人工促进更新米槠次生林群落α多样性分析

Analysis of α Diversity in Artificially Assisted Regeneration Castanopsis carlesii Secondary Forest

于2022年,以福建省尤溪国有林场经不同间伐强度(强度间伐、中度间伐、弱度间伐)实施人工促进更新40 a的米槠(Castanopsis carlesii)次生林为研究对象,探讨人工促进更新的米槠群落结构特征和物种多样性。结果表明:物种—样方累积曲线分析表明研究区域内抽样充分,群落总体的物种—样方累积曲线选择4种数学模型进行拟合,最优拟合模型选用对数平方函数,方程为S=(2.9804+1.7418log A)2。物种组成较为丰富,群落总体共有39科58属102种;米槠重要值最高,形成乔木层优势树种;随着定向干扰强度的增加,对目的物种重要值的影响也逐渐增大。物种丰富度、Shannon指数、Simpson指数和稀疏度不同间伐强度之间差异不显著;而乔、灌、草层次之间差异显著,物种丰富度、Shannon指数、Simpson指数和稀疏度排序为灌木层>乔木层>草本层。研究结果可为该地区地带性常绿阔叶林植被恢复和物种配置提供参考。

In 2022,the secondary forest of Castanopsis carlesii,which has be en artificially assisted regeneration by different thinning intensities(heavy t hinning,moderate thinning,low thinning)for 40 years in the state-owned fores t farm of Youxi County,Fujian Province,was taken as the research object to expl ore the characteristics of community structure and species diversity of artifici ally assisted regeneration of Castanopsis carlesii.The results showed that:t he analysis of species-area accumulation curve showed that the sampling was suf f icient in the study area,four mathematical models were selected to fit the spec ies-area accumulation curve of the community as a whole,and the logarithmic sq uare function was selected as the optimal fitting model,the equation was=(2.9804+1.7418log A)2.The species composition is relatively rich,and the com m unity has a total of 39 families,58 genera and 102 species;Castanopsis carlesi i has the highest important value and forms the dominant tree species in the tre e layer;with the increase of directional interference intensity,the impact on the important value of the target species increases gradually.There were no si gnificant differences in species richness,Shannon index,Simpson index and diff erent thinning intensity;and there were significant differences in tree,shrub and herb layer,the order of species richness,Shannon index,Simpson index and rarefy was shrub layer>tree layer>herb layer.The results can provide referenc e for vegetation restoration and species allocation of zonal evergreen broad-lea ved forest in this region.