The Study On The Character Of Pinus-Quercus Community In Jiufeng Area And Simulate Plant In The City

Use technical courses combined in field survey and indoor analysis and experiment, the character of Pinus-Quercus community were studied, and simulate community were set up in the city. Based on the date, the results were so follows:1. Soil of the community appeared a little acidic, pH was 6.16⁶.58.In topsoil, organic matter, N-base, easily soluble potassium and easily soluble phosphorus were 1.66 %, 35.17g·Kg^-1,137.36mg·Kg^-1 and 1.62mg·Kg^-1, the fertility was low. The moisture condition was middling in the community, but rainfall and sizzler were in the corresponding period, the rain mostly appeared in Jul, Aug and Sep. These live conditions were advantaged to plants growing.2. There were 36 families, 56 genera and 58 species in the community. Arbor was the dominant species, with a maximum density of 1975/hm².Phanerophytes were the largest in all species and therophytes were in the middle. The stratification of the vertical structure of this community was obvious, with three main layers-tree stratum, shrub layer and herbs layer. Oriental Oak was absolutely dominant in the tree stratum, its importance value was the highest, it was the dominant and preponderant species in the community, main concomitant species were Oriental White Oak, Tabularformed Pine and Japanese Mulberry. The preponderant species in shrub layer were Smallflower Grewia and Heterophyllous Negundo Chastetree. And in herbs layer were Undulateleaf Oplismenus, Denticulate Ixeris and Wormwoodlike Motherwort.3. The tree stratum's species diversity index was low, community's species richness and species diversity index were mostly influenced on shrub layer and herbs layer, community was at prophase of recover. Community's species richness, Shannon- Wiener index, Simpson index, species encounter rate and Pielou index reflected accordant trend. The trend in different layers was tree stratum> shrub layer > herbs layer. Average value of Shannon-Wiener index was 2.61, consider revising range was 1.73².94, averages value of PIE was 0.86.4. There were neither very significant nor significant positive species-pairs in the community. Positive association indexes among Oriental Oak, Smallflower Grewia and Heterophyllous Negundo Chastetree were large. There was only one very significantnegative species-pair in tree stratum, and four in shrub layer, ten in herbs layer. Positive association between species occurs where members of a species-pair have similar biological characteristics or traits that make them ecologically adaptive for similar habitats. Negative association between species occurs spaces repel of species and adapt different micro-habitat.5. Most species' niche breadth were between 1 and 2.The niche breadth of Oriental Oak in arbor layer was the largest, with the value of 2.070, the niche breadth of Oriental White Oak and Japanese Mulberry were 2.052 and 1.942.In shrub layer, the niche breadth of Smallflower Grewia, Heterophyllous Negundo Chastetree and Chinese Clovershrub were 2.022, 1.936 and 1.870, and in herbs layer Undulateleaf Oplismenus 1.953, Neat Philippine Violet 1.935, Violet Orychophragmusl.876.6. There was no absolute overlap species-pair in the community. There were 13 species-pairs with niche overlap value over 0.5,which was the 61.9 % in arbor layer, The niche overlap values among Oriental Oak, Japanese Mulberryand and Purpleblow Maplewere all over 0.9.There were 7 species-pairs with niche overlap value over 0.7,which was the 15.6 % in shrub layer, and 9 species-pairs with niche overlap value 0,which was the 20 %.There were 52 species-pairs with niche overlap value over 0.7,which was the 24.8 % in herbs layer, and 10 species-pairs with value over 0.9,4 species-pairs with value O.The niche overlaps between the species with bigger niche breadth and other species were higher, and those of the species having similar environmental requirements were also higher. The more intense the positive association was, the larger the value of niche overlaps was, and the more intense the negative association was, the smaller the value of niche overlaps was.7. To set up a stimulant community, live condition must be close to the nature community and fitting soil and climate condition must be created. For example, alter soil pH to make it a little acidic, and fertilize to make it more nutrient. Choose the species combination and collocate mode as nature community, then join local and foreign species. Make Tabularformed Pine, Oriental Oak and Sawtooth Oak as the dominate species, Oriental White Oak and Black Locust as main concomitant species in arbor layer, make Tatarian Dogwood and Chinese Clovershrub as dominant species in shrub layer, Carex giraldiana Kiik. and Longtube Ground Ivy as dominant species in herbs layer. Join the community with many garden plants such as Ginkgo, Chinese Ash, China Rose and Chrysanthemum etc, to enlarge species diversity and maintain the community steady and enhance the sight effect. Be sure that the community must in a high harmonious system, construct a plants community with landscape be assort with ecology.