浙江省安吉县次生林数量分类与排序

Quantitative Classification and Ordination of Secondary Forests in Anji,Zhejiang Province

采用典型样方法对浙江省安吉县次生林进行取样,利用82块样地资料对群落进行TWINSPAN等级分类和CCA排序,分析了安吉县次生林的群落类型和结构。结果表明:利用TWINSPAN法,按照不同指示种将乔木层物种划分为10种群落类型。CCA排序结果显示:第1排序轴与海拔呈显著的正相关关系,与枯落物厚度呈负相关,反映了温度和土壤条件的作用;第2排序轴与枯落物厚度、坡度呈正相关,反映了水分、光照条件的作用。

Eighty-two typical quadrats were selected in secondary forests in Anji, Zhejiang Province in order to study the struc- ture of the communities using the quantitative classification （TWINSPAN） and ordination （CCA） methods. Results of TWINSPAN classification indicate that these quadrates can be classified into 10 types based on the floral composition of canopy layer. CCA ordination demonstrates that the first ordination axis is significantly positively correlated with elevation and negatively correlated with litter layer thickness, reflecting the function of temperature and soil conditions. The second axis is positively correlated with litter layer thickness and slope gradient, indicating the role of water and light conditions.