北京鹫峰地区松栎混交群落结构与物种多样性

利用在北京鹫峰地区设置的8个样方的调查资料,对该地区松栎混交群落结构及物种多样性进行了分析研究。结果表明:群落土壤呈微酸性,自然肥力较低;调查共计维管束植物58种,隶属于36科56属,其中乔木树种占主导地位,植株的最大密度为1 975株/hm2;生活型谱以高位芽植物最多,1年生草本植物比例居中,反映出群落水分条件一般;群落结构分明,乔木层、灌木层和草本层层次清晰;乔木以栓皮栎占绝对优势,其重要值最高,优势度明显;乔木层物种多样性指数不高,群落物种丰富度和多样性指数主要受灌木层和草本层影响,群落处于恢复前期;群落的物种丰富度、物种多样性指数和均匀度指数反映出基本一致的趋势,不同层次的Shannon-Wiener多样性指数、Simpson优秀度指数、种间相遇机率和Pielou均匀度指数的趋势基本上是草本层>灌木层>乔木层。

Community structure and species diversity of Pinus - Quercus forests in Jiufeng area of Beijing

Based on the date collected from 8 sample plots of Mt.Jiufeng,community structure and species diversity of Pinus-Quercus forests were studied in that area.The results showed that soil appears a little acidic and low-fertility.There are 36 families,56 genera and 58 spicies in the community.Arbor is the dominant species,with a maxmum density of 1 975 plant/hm~2.Phanerophytes are the largest in all species and therophytes are in the middle,which reflects the moisture condition is midding in community.The stratification of the vertical structure of this community is obvious,with three main layers-tree stratum,shrub layer and herbs layer.Quercus variabilis is absolutely dominant in the tree stratum,its importance value is the heighest and the superiority is obvious.The tree stratum's species diversity index is low,community's species richness and species diversity index are mostly influenced on shrub layer and herbs layer and the community is at prophase of recover.The community's species richness,species diversity index and equality index reflect accordant trend.Among the three layers,the Shannon-Wiener index,Simpson index,species encounter rate and Pielou index in the herbs layer are the heighest,and the tree stratum are the lowest.