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《Journal of Anhui Agricultural Sciences》 2011-19
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Dynamic Variation Characteristics of Phosphorus in Paddy Field Runoff in Saline Land and its Potential Environmental Effect

YUAN Rui-xia et al(School of Environmental Science and Engineering,Donghua University,Shanghai 201620)  
[Objective]The aim was to study the dynamic variation characteristics of phosphorus in paddy field runoff in saline land and its potential environmental effect.[Method]Taking Qianguo irrigation district in soda-saline land in Songnen Plain as study object,the dynamic variation law of phosphorus in paddy field runoff under different irrigation conditions and its potential environmental effect were discussed.[Result]Surface water in paddy field was alkaline,and scattered soil had poor fertilizer conservation capacity,while total phosphorus(TP) accumulated in soil surface layer,which could increase the risk of phosphorus loss with runoff.Phosphorus loss in paddy field mainly occurred in irrigation period and rainstorm runoff period,and the concentration of TP,particulate phosphorus(PP),total dissolved phosphorus(TDP) and dissolved reactive phosphorus(DRP) in paddy field runoff decreased with time,especially PP,while phosphorus concentrations exceeded critical values resulting to eutrophication,which affected water quality safety in Chagan Lake.Phosphorus concentrations in water recession canal increased with time,and eutrophication with different degrees appeared under high temperature;TP concentration in surface water in paddy field was highly negatively correlated with that in water recession canal,and the correlation coefficients R2(α = 0.05) in three paddy fields were 0.850 9,0.896 4 and 0.915 3,respectively.The loss load of phosphorus in paddy field with the best irrigation condition was higher,and its pollution risk grade was the highest,so it should be monitored and controlled mainly as the critical source area of phosphorus loss.[Conclusion]The study could provide theoretical foundation for developing saline land rationally,establishing optimal management measure of phosphorus in saline land and controlling phosphorus loss in farmland to protect local water resources.
【Fund】: 国家水体污染控制与治理科技重大专项(2008ZX07207-006-04);; 东华大学2011年度博士研究生创新基金项目(11D-11311)
【CateGory Index】: X52
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