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《ACTA SCIENTIAE CIRCUMSTANTIAE》 1996-01
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STUDIES ON RAINFALL POCESS, FLOW-MAKING AND NITROGEN AND PHOSPHORUS LOSSES

Wu Lun(Department of Urban and Environmental Science,Peking University,Beijing 100871)Li Peiwu (Department of Geography,Tianjin Normal University,Tianjin)  
Taking the Yuqiao Reservoir area as an example,process of rainfall and flow making,the output features,changing tendency,general character and diversity of the N and P have been studied using artificial rainfall.The factors affecting the losses of N and P were investigated as well.The output concentration of TN,solutive N , TP,solutive P decreases during the process of runoff.TN,TP,and the quantity of runoff correlate positively with the soil erosion.In most cases, the descending rule of the output concentration shows as a parabolic curve ,and the decreasing rate is high. The output concentration of solutive N shows linear distribution; the output concentration of solutive P shows non-linear distribution. The output rate of N , P decreases during the process of runoff,and it's curve shows deviation distribution, Cs0.Since the output quantity of N,P increases while rainfall intensity increases,the stronger rainfall intensity will cause more serious erosion , that is, N,P will bleed with large quantity. The quantity of N, P bleeding shows"more in basin than in hill,more in hill than in mountaini"in each experiment sample with different plants.So soil parent material,soil N,TP,soil water protection play the leading role in N,P bleeding.
【CateGory Index】: X144
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