Analysis on Community Characteristics of Beijng Baimujing Air Seeding Pinus tabulaeformis Plantation

The species composition,flora,structure and regeneration of the air seeding Pinus tabulaeformis communities in Baimujing,Liubingpu Township,Yanqing Country of Bejing Municipality were studied by typical quatrat sampling method survey.The results showed that 61 species of the vascular plant in 51 genera,30 families existed in the communities.The phanerophyte life form was predominant in species,followed by hemicryptophyte and geocryptophyte life forms,indicating that there was great difference in the special combination of moisture and temperature in the mid-elevation mountainous area and the life form spectrum was associated with the climate feature of the transition from warm temperate to temperate zone.The study also showed that there was evident vertical structure inside the community.The P.tabulaeformis arbor layer was overly dense that triggered off severe differentiation among the trees and formed a large quantity of suppressed plants.The horizontal structure was pretty simple.These communities were named P.tabulaeformis-Spiraea trilobata-Carex lanceolata communities.It was proposed that the management regime of these artificial communities should be different from the natural forests of P.tabulaeformis.