A Study On Community Structure Of Lespedeza And The Influence Of Cutting For Its Nutrient Component

Lespedezas have many valuable uses, it's not only used as high grade forage toimprove entironment and soil but also good to ecology of holding water and soil.The studies of this thesis on nutrient composition and biomass of several species of Lespedeza, including Lespedeza bicolor Turcz,L.cuneata G.Don, L. daurica Schindl, L.juncea Pers., indicates different cutting frequency have different influence on coarse fibre, coarse protein and aboverground biomass as well as relation between them.(1) With increase of cutting frequency, content of coarse fibre decline ,and have good dainty, the influence of cutting frequency on coarse protein is not so distinct , but the above ground biomass have great distinctness.(2) we found that 2 times per year is the best cutting frequency for Lespedeza with annual roots and 3 times for Lespedeza with biennial and perennial roots .Taking Lespedeza bicolor which distributes abroad for example, we investigate the community structure of Lespedeza bicolor bush in XiaoLongMen region in BeiJing and get conclusions as below.1) Sample areas involved are quite rich in plant species which including 100 species belong to 34 families,75 genera . Most of these species are Herbage,and frutices are infrequent in Lespedeza bicolor bush.2) the species diversity of Lespedeza bicolor bush is quite marked in different entironment; that is (from high to low) : hillside > flat> valley ; forest: Larix principis-rupprechtii Ma.r sparse forest > Quercus mongolica Turcz - Betula davurica Pall, sparse forest> Populus cathayana Rehd.-Juglans mandshurica Maxim.forest .With the rise of altitude, the species diversity decreases from 1075 meter to 1350 meter, and then increases from 1350 meter to 1450 meter.3) as a pioneer plant, Lespedeza bicolor can inbrake faster than Juglans mandshurica and Populus cathayana , and becomes the community-buiding species.Futhermore,it is leguminous plant with enormous action on water and soil. So ,it is potential to take advantage of Lespedeza bicolor on improving soil,maintaming water and soil, recovery of entironment,and providing favorable conditions for the growth of arbor...