Study on the Migration and Transformation of Nitrogen and Phosphorus and the Optimal Water Surface Ratio in a Field-Ditch-Pond System in the Fenhe Plain
A large amount of pesticides and fertilizers applied during crop cultivation only partially affect the crops,with the majority being carried away by farmland drainage into nearby water,thus causing non-point source pollution.In this study,nitrogen and phosphorus concentrations in the water of fields,ditches,and ponds were sampled and analyzed during long-term irrigation and rainfall periods in an experimental area.The migration and transformation patterns of nitrogen and phosphorus in the field-ditch-pond system were examined,and an optimal water surface ratio was proposed.Based on the requirements for farming and water-saving emission reduction,engineering requirements for farmland construction and the field-ditch-pond(wetland)system construction model were suggested.The results indicate that ditches and ponds have a certain purifying and intercepting effect on nitrogen and phosphorus in farmland.Proper planning and establishment of the field-ditch-pond system can improve nutrient utilization and reduce pollution.The findings provide valuable references for the construction of farmland engineering in land ecological restoration.
field-ditch-pond systemmigration and transformation patternsoptimal water surface ratio
万方数据
维普
