Eco-physionlogical Studies On Realationship Among Species In Natural Community Of Baotianman

In order to discuss the relationships among species of populations, we observed the plants growing and developing process of natural populations and measured the photosynthesis characteristic of different plants by LI-6400 portable photosynthesis system under the complete natural growth condition in Bao Tianman.The result showed: (1) Buds bursting of the branch are earlier 20 days than arbor trees. The different species are different in layer about 1 weeks, but the days of arbor trees from buds expanding to bursting is much littler than bush. (2) Arbor trees, bush and grass are sprouted at the beginning of April, middle of March and beginning of March respectively. The interval between grass and bush is shorter, but bush and arbor tree is longer. (3) The branch growth of arbor tree, bush and grass have 3 stages of fasting, slowing , stopping. (4) Grass doesn't grow at the beginning of May, and bush at the beginning of June and arbor tree on the middle of June, however, R.cockburnianus Hemsl. at the middle of October. (5) The growth index of Q.variabilis B1. shoots are higher than A.julibrissin Durazz.and R. chinensis Mill.in tree layer, and Rxockburnianus Hemsl.'s is higher than S.chinensis Maxim.and F.suspensa. in shrub layer, and L.aggregato Kosterm.is higher than L.clethtoedes Duby. in grass layer. (6) The growth branch index of S.chinensis Maxim.is the fastest, especially, the formation of leafs need the less time than the others. (7) When leafs of trees off, growth of new buds are nearly stopped. (8) The sequence of number of leafs in one branch is shrub, arbor tree and grass, and of area single leaf or little leaf is grass, arbor tree and shrub, and of branch length and stem height is grass, shrub and arbor tree, and of branch coarseness and grass is arbor tree ,grass and shrub. (9) When branchs of Q.variabilis Bl.fast growing,the net photosynthetic rate of its leafs is higher than A.julibrissin Durazz.and R. chinensis Mill's in tree layer, the net photosynthetic rate of S.chinensis Maxim.is lower than F.suspensa, and Rxockburnianus Hemsl. In different seasons in shrub layer, while F.suspensa.'s net photosynthetic rate is the highest. In spring and autumn the net photosynthetic rate of L.aggregato Kosterm. is higher than L.clethtoedes Duby.in grass layer, while in summer is lower than L.clethtoedes Duby.,but difference of net photosynthetic rate of them is little.(10)In March ,the net photosynthetic rate of shrub and grass plant is the highest in their growing seasons. From May to September...