Study On Quantitative Characteristics Of Wild Phellodendron Amurense In Beijing Mountainous Area

The dissertation studied quantitative characteristics of wild Phellodendron amurense in Beijing mountainous area by using the quantitative ecology method,.Identified the optimum environment and communities, and provided the most appropriate conservation measures.(1) The database of Phellodendron amurense in Beijing mountainous area has been set according to the records of the field investigations and historical statistics, including36plots,559trees,.The average density is363trees per hectare. The community is divided into8formations, Phellodendron amurense formation, Tilia mongolica formation, Quercus mongolica formation, Tilia amurensis formation, Larix gmelinu van principis-rupprechtii formation, Populus davidiana formation, Fraxinus rhynchophylla formation, Mixed forest. Out of which Phellodendron amurense has the highest possession of the resource, second comes the Mixed forest.(2) Trees, shrubs, herbages has obvious layered in the communities, Species diversity is herbaceous>Shrubs>trees. According to the niche breadth and niche overlap analysis,currently the Mixed forest, Quercus mongolica formation, Tilia amurensis formation, Phellodendron amurense formation, Fraxinus rhynchophylla formation are under good living condition, and the most stable communities are Mixed forest and Quercus mongolica formation, and the Phellodendron amurense formation and Fraxinus rhynchophylla formation communities are unstable. The living conditions of Populus davidiana formation, Tilia mongolica formation and Larix gmelinii var principis-rupprechtii formation are poor, and the communities are unstable.(3) The population quantitative characteristics of Phellodendron amurense in the8different formations showed that the population is increasing, and appear to be cluster distribution. Lack of resources will lead to competition. (4) According to the quantitative analysis of different environmental factors,we knew the most suitable ecological environment is the well drained sunny slope area that is below1000meters altitude.(5) Comprehensive analysis showed that The Mixed forest in adequate light and good drainage at below1000meters altitude is most suitable for its survival,,follows by Quercus mongolica formation and Tilia amurensis formation, and mutual conservation of Tilia amurensis and Phellodendron amurense can be considered. The seedlings are suggested to use ex situ conservation in Phellodendron amurense formation, Fraxinus rhynchophylla formation, Populus davidiana formation, Larix gmelinii van principis-rupprechtii formation, Tilia mongolica formation.