Analysis On Community Structure Characteristics Of Pinus Tabulaeformis And Pinus Armandii In Guanyinshan Forest Region Of Shaanxi Province

Community slightly based on the middle qinling kuanyinshan nature reserve, huashan pine forest and mixed forest community as the research object, through to adopt comprehensive field investigation of typical sampling method, using the method of TWINSPAN(two-way clustering analysis method), divided into community types, comprehensive study of the middle qinling kuanyinshan nature reserve community slightly, huashan pine forest and mixed forest community characteristics.The results showed that:(1) the middle qinling kuanyinshan community slightly nature reserves are mainly distributed in elevation 1150-1700 m of zhongshan strip, huashan pine are mainly distributed in elevation 1700-2000 m, mainly distributed in the mixed forest community at an altitude of 1300-1700 m, due to the different habitat, in both the north and south slope showed community distribution and structural differences.In Buddha mountain nature reserve, this study community slightly, huashan pine forest and mixed forest community distribution of locale typical sample investigation, 34, 296 species of vascular plants, belonging to 77 families and 77 genera.Among 72 families angiosperms and gymnosperms 2 families, ferns, 3.Has a wide distribution of plants, including: pinaceae, fagaceae, rosaceae, compositae, gramineae and liliaceae.There are 49 kinds of tree layer, shrub layer, a total of 106 species, herb layer, a total of 141 kinds of plants.Joe, irrigation, grass coverage(crown density) size of three layers: tree layer > herb layer > shrub layer.(2) by the method of TWINSPAN, qinling middle pine oak mixed forest community were the number of classification, the community is divided into 11 association: I from pinus tabulaeformis, spend lespedeza, mugwort group;Orange â…¡ pinus tabulaeformis- China- wild green MaoQun from;â…¢ pinus tabulaeformis, lespedeza, big wrap around needle from carex group;How indigofera kirilowii IV goose grass--- community slightly;V China- huanghua willow- sedge group from north China;VI Xun sub- China- sichuan wintergreen group from;â…¦ China- leaves Xun sub- big wrap around needle from carex group;â…§ China- HuaJie bamboo- big wrap around needle from carex group;â…¨ pinus tabulaeformis- China-lespedeza- grasses from group;â…© mountain red China, pinus tabulaeformis, full- mans group from.