历山山核桃群落数量分类与排序

Quantitative Classification and Ordination of Juglans mandshurica Communities in Lishan Nature Reserve,Shanxi

应用TWINSPAN分类和DCA排序方法分析山西历山山核桃群落生态关系。结果表明:1)应用TWINSPAN将山核桃群落的35个样方划分为7个群丛,分别是山核桃-连翘-升麻群丛、山核桃-连翘+牛奶子-蓝萼香茶菜群丛、山核桃-连翘-草乌头群丛、山核桃-连翘-香薷群丛、山核桃-连翘-披针叶苔草+筋骨草群丛、山核桃-连翘-风毛菊+牛尾蒿群丛和山核桃-连翘-藜芦群丛;2)35个样方DCA排序图较好地揭示了山核桃群落的分布格局与环境梯度的关系,排序图第1轴基本反映各群丛所在生境的坡向变化,第2轴基本反映了植物群落的地形和土壤类型变化,坡向、地形和土壤类型决定了山核桃群落类型的规律性变化;3)7个群丛草本层优势种在DCA排序轴上的分布格局在很大程度上影响着群丛在DCA排序轴上的分布格局。

The ecological relationship between Juglans mandshurica communities and environment was analyzed by using TWINSPAN and DCA. The results were as the following： J. mandshurica communities were classified into 7 associations by TWINSPAN,which were Assoc. Juglans mandshurica-Forsythia suspensa-Cimicifuga foetida,Assoc. Juglans mandshurica-Forsythia suspensa＋Elaeagnus umbellata-Rabdosia japonica var. glaucocalyx,Assoc. Juglans mandshurica-Forsythia suspensa-Aconitum kusnezoffii,Assoc. Juglans mandshurica-Forsythia suspensa-Elsholtzia ciliate,Assoc. Juglans mandshurica-Forsythia suspensa-Carex lanceolata＋Ajuga ciliate,Assoc. Juglans mandshurica-Forsythia suspensa-Saussurea davidii＋Artemisia subdigitata and Assoc. Juglans mandshurica-Forsythia suspensa-Veratrum nigrum. The results of DCA ordination of 35 quadrats showed the distribution pattern of J. mandshurica communities changed with the gradient of environment factors. The first axis of the DCA ordination reflected the aspect gradient,and the second axis reflected the terrain and soil type gradient. The DCA ordination of 20 dominant species was much similar to that of 7 associations,which indicated the distribution pattern of the dominant species in the communities,to some extent,determined that of the community type. Aspect and terrain were the main factors affecting the composition and distribution of the J. mandshurica communities.