Study On The Phosphorus Of Degradation Meadow Ecosystem In Wugong Mountain

This article in meadow zone of Wu Gong mountain at an altitude of1600m~1900m,setting altitude of50m as a gradient, gradient, Choosing the similar simple conditionswhich including meadow degradation degree, meadow type, soil and terrain as the objecton each gradient, each choose3pieces of10m×10m elevation gradient experiment samples,a total of21pieces of samples. And in each increment random3pieces of normal meadowarea as control. Using analysis of variance, correlation analysis, phosphorus chambermodel method, this paper expounds the different altitude and different soil depthdistribution characteristics of soil phosphorus; Analyze the degraded meadow ecosystemWu Gong mountain soil phosphorus availability of physical, chemical and biologicalfactors; Discussed each indoor p reserves and flow process; For ecological restoration inWu Gong mountain meadow degradation area provides a scientific basis.The main conclusions were presented as follows:1) Soil phosphorus content, total phosphorus, organic phosphorus content, totalextractable inorganic phosphorus there are significant differences in the same differentaltitudes, indicating that the effects of phosphorus content in soil elevation of each subject,but with the various forms of phosphorus pull variation obvious, the impact of altitude onvarious forms of phosphorus content is not clear. Soil phosphorus content, total phosphorus,organic phosphorus content, total inorganic phosphorus can be extracted at the samealtitude of the different manifestations of0-20cm soil layer was significantly greater thanthe20-40cm, which shows a table with various forms of phosphorus cohesion.2) The soil available phosphorus and calcium-phosphate was significantly negativecorrelation, which shows that soil available phosphorus content will reduce with theincrease of the content of calcium-phosphorus content, it attributed to calcium phosphatewas insoluble compounds, plants can not directly use of calcium-phosphorus, and thusaffecting the effectiveness of soil phosphorus. With soil available phosphorus in soil totalphosphorus, aluminum-phosphate, microbial biomass phosphorus was significantlypositively related, which indicate that soil total phosphorus, aluminum phosphorus, soilmicrobial biomass phosphorus may be a potential source of available phosphorus in soil.Soil microbial biomass phosphorus was soil organic phosphorus into plant an importantway to absorb phosphorus, microbial biomass phosphorus has a fast turnover rate, canincrease the effectiveness of soil phosphorus. Soil total phosphorus and availablephosphorus level of soil effective phosphorus content and soil total phosphorus contentwas not directly The soil bulk density, water content quality can change soil phosphorusmigration conditions, the oxygen content of the soil and soil redox potential, thus affecting soil p migration ability, the metal elements in soil and phosphorus chemical forms,influences the effectiveness of phosphorus removal. Soil acidity and soil organic matter onsoil influence on phosphorus removal, and each form hydrolysis of total acidity of the soilincrease can enhance the effectiveness of phosphorus, and the influence of soil pH of soilphosphorus availability was relatively complex, the change of the soil pH can change theconfiguration of soil phosphorus, which affects the effectiveness of phosphorus. Content ofavailable p in soil increased with the increase of soil organic matter content increased, soas to improve the effectiveness of soil phosphorus removal, and soil total phosphorus,organic phosphorus can rises with the soil organic matter content, to further improve theeffectiveness of soil phosphorus. Soil microbial decomposition of soil organic phosphorus,on the one hand into soil to use effective phosphorus, on the other hand also can absorb itsown a phosphor after death released into the soil conerted to soil available phosphorus.3) In study area soil p total capacity was6.6t hm-2, plant root absorption ofphosphorus from the soil reached8.39kg hm-2for each year, including3.23kg hm-2intoliving on the ground, it was5.16kg hm-2storage in root system. After every October, theliving body was had0.35kg hm-2phosphor into the root of as nutritional growth next year,set the dead body and litter was had2.88kg hm-2phosphor, after burning into the soil, andthe root of ist5.51kg hm-2p increases with root death, decay and into the soil, finishbetween plants and soil phosphorus removal cycle. Phosphor cycle research was not ashort-term behavior and its circulation and transfer rule is long. Therefore, Wu Gongmountain meadow degradation phosphor cycle research further to be thorough, especiallyphosphor input and output of the research in the study area was not enough.