| In recent years, China’s planting area of facilities agriculture expanded rapidly. Along with the rapid development of agricultural facilities, the problem of nvironmental pollution has become increasingly prominent position. The wide use of chemical fertilizer for the purpose of obtaining high yield lead to a significant increase of pollutants in runoff water and seepage water, the content of organic matter in the soil were decreased and its efficiency has been constantly reduced. Agricultural non-point source pollution have many interfering factors and the amount of pollutants is difficult to use the method of monitoring to get. The study was started at South China Institute of Environmental Science’s lab based in Jin Shan Town,Wen Chang City,Hainan Province.Simulation and experimental study was applied to Hainan intensive cropping surface runoff and underground seepage loss in our study. Simulation and experimental study was applied to Hainan intensive cropping surface runoff and underground seepage loss in our study.The rule of pollutant discharge of Hainan intensive cropping non-point source surface runoff and underground seepage pollutants(TN、TP) is studied and at the same time we established the calculation model.We summed up the calculation method of the non-point source runoff and seepage pollution in the intensive cropping area in Southern China Providing the technical support for the non-point source pollution.The main results are listed as follow:(1) The runoff(seepage) and rainfall significantly positive correlation, The formula of the runoff is Q= 3.3867e0.0383P,R2=0.9478; The formula of the seepage is Pa= 10.5651n(P)-33.385, R2=0.9709. The equation is suitable for calculating runoff from one rainfall event in the intensive cropping area of the southern.(2) The concentration of the total nitrogen(TN) and the total phosphorus(TP) in the runoff bore a close relationship with the soil available nitrogen(phosphorus) content before raining and the rainfall runoff. Calculating formula for the concentration of the total nitrogen(TN) in the runoff is C(RN)=-0.052Q+0.183w (N), R2=0.996; Calculating formula for the concentration of the total phosphorus(TP) in the runoff is C(RP)= 0.008Q +0.007w (P),R2=0.985.(3) The concentration of the total nitrogen(TN) and the total phosphorus(TP) in the seepage bore a close relationship with the soil available nitrogen(phosphorus) content before raining and the rainfall seepage. Calculating formula for the concentration of the total nitrogen(TN) in the seepage is C(SN)= 0.289+0.072w (N), R2=0.996. Calculating formula for the concentration of the total phosphorus(TP) in the seepage is C(SP)= 0.075Pa-0.001w (P),R2=0.982.(4) The soil nutrient content was related to the age of the greenhouse and increased with it. Calculating formula for the soil available nitrogen content and phosphorus content were: y=-0.8619x2+17.017x+69.529,R2=0.9923;y=-4.156x2+47.151x-2.9286,R2=0.9947,significant ly stronger.(5) Compared with the data of the theory loss and the actual loss of the pollutants are calculated by the field measurement data, the correlation coefficient of TN and TP was 1.4785 and 1.5864 in the loss of rainfall runoff process; the correlation coefficient of TN and TP was 1.5207 and 1.3865 in the loss of rainfall seepage process.The calculation formula of loss of total nitrogen and total phosphorus are as follow after correction: M(RN)= α N × S × e0.0383x × [-0.18×11.47e0.0383x+0.62y] M(RP)= α P × S × e0.0383x × [0.03 × 11.47e0.0383x+0.02y] M(SN)= β n × S × [32.26(lnx)2-203.86 lnx+0.76ylnx-2.4y+322.11] M(SP)= β P × S × [8.37(lnx)2-52.9 lnx-0.01ylnx+0.03 y+83.59]... |
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