Agricultural Non-point Ganjiang River Basin Of Migration Patterns And Non-point Pollution Load

Along with the non-point source pollution control and gradually gain the development ofagricultural modernization, of the valley of poyang lake ring of agricultural non-pointpollution has become an important sources of water poyang lake. The first major tributarieswater system poyang lake, the water quality conditions gan gan is directly related to theYangtze river downstream water and poyang lake environment safety. Studies have shownthat, nitrogen and phosphorus eutrophication is the key factor, and control of rainfall runoffwater nonpoint source of nitrogen and phosphorus is an important source of load, therefore,research on ganjiang river basin of nitrogen and phosphorus non-point sources with themigration of rainfall runoff into research and non-point pollution load research, to control thewater pollution and poyang lake gan, and promote the harmonious ecological plains poyanglake has important significance.Due to the different land use type of nitrogen, phosphorus loss characteristics and loss isdifferent, the choice of the downstream ganjiang vegetables and rice fields to two kinds oftypical agricultural farming, through the different season, different rainfall and fertilizer,different strength test analysis of rainfall runoff water drainage ditches, research of nitrogenand phosphorus loss of rainfall runoff migration transformation with pollutants and thecharacteristic of the law; Use of output coefficient model and XiaJiang, the state of waterquality material, hydrological station and through to the output coefficient model to simulatethe estimation results and research area2006~2009years of agricultural non-point pollutionload the comparison and analysis, sure ganjiang downstream area2006~2009years ofagricultural non-point pollution load and calculation model. Get the following mainconclusions:(1) the rice fields in the ditch system microbial degradation, plants absorb and sedimentadsorption, the comprehensive function of the loss of the total nitrogen, ammonia nitrogen,nitrate nitrogen, nitrite nitrogen and phosphorus, solubility are phosphate concentration in thedrainage ditches along the riser is in decline, the average intercept removal rate law were45.75%,45.59%,48.07%,46.52%and53.53%,42.39%, rice paddies to ditch system of theloss of various forms of nitrogen and phosphorus has the good intercept removal efficiency. (2) the loss of the rice fields of nitrogen and phosphorus concentration of transplantingrice growth period was>> fallow period. Rice was lost season total nitrogen1.8374mg/L, isfallow period of total nitrogen is1.99times that of total nitrogen period is1.5times; Tillageperiod of ammonia nitrogen concentration is fallow period of1.4times, is water period ofwater samples1.1times; Loss of nitrate nitrogen concentration season was0.9001mg/L isgreater than0.5381mg of rice growth/L and fallow period of0.4593mg/L; Nitrite nitrogen isalso the largest, lie fallow period was least season.(3) the vegetables to the loss of the total nitrogen in no3(superscript-n higher proportionof total nitrogen, the proportion of42.05%on average, nitrate in vegetables in the long in thegrowing accumulation effect is obvious. Vegetables to the loss of n and p concentration levelshigher than rice paddies, LeiCi sampling concentration in the land of vegetables, the averagetotal nitrogen, ammonia nitrogen, nitrate nitrogen and phosphorus, solubility are theconcentration of phosphate were9.469mg/L,2.3441mg/L,3.5974mg/L and4.1066mg/L,3.0782mg/L, rice paddies n and p concentration of1.4207corresponding mg/L,0.5784mg/L,0.2742mg/L and0.3143mg/L,0.1259mg/L. The loss of all kinds of vegetables to nconcentration is4.1to13.1times that of rice paddies, loss of all kinds of p is13.1to24.2times that of rice paddies.(4) establish the gan downstream of the pollution load for estimating model. The modelresearch area20062009years of agricultural non-point pollution load calculation results andthe measured load the comparative analysis, error within20%, compared with the similarresearch high accuracy, suitable for agricultural non-point pollution downstream ganjiangload estimation, for poyang lake water environmental pollution control provides theory basis.(5) according to the model simulation results, and draw the conclusion that livestockfarming, and cultivated land and agricultural population is ganjiang downstream area ofnon-point source pollution source of key, and then put forward the correspondingdevelopment of small sewage treatment facilities, the construction "ditch+pond" ecologicalwetland system control measures for ecological development, ring poyang lake and waterenvironment control to provide the reference.