Characteristics and Release Prediction of Surface Soil Nitrogen and Phosphorus Leaching in Xiashan Reservoir Basin
The surface soil of Xiashan Reservoir Basin was taken as the research object,and the leaching situation of total nitrogen (TN),total phosphorus (TP) and ammonia nitrogen (NH3-N) under different leaching amounts was simulated by indoor soil column leaching method,and the release amount of nitrogen and phosphorus was predicted.The results showed that the TN,TP and NH3-N contents of cultivated land in this region were higher than those of forest land under different land use modes,but there was no significant difference.The leaching concentration of TN,TP and NH3-N showed significant positive correlation with the total amount in the soil. The concentration of TN in leaching solution de-creased gradually with the increase of leaching amount,which indicated that the adsorption capacity of soil for TN was poor,and it was easy to lose with rainfall infiltration.TP and NH3-N did not change significantly with the increase of leaching amount,and their leaching intensity was lower than TN.Under the condition of a certain leaching amount,the leaching concentration of nitrogen and phosphorus was exponentially corre-lated with the volume of leaching solution.The leaching function of surface soil nutrients in Xiashan Reservoir Basin could be obtained by fitting the leaching concentration of nitrogen and phosphorus with the increase of leaching amount:C=C0eKV.The average annual release concentra-tions of TN,TP and NH3-N at the sampling points were simulated and calculated by the deterministic mathematical model to be 23.00,4.33 and 4.49 mg/L,respectively.The comprehensive nutritional status index of TN and TP annual release concentrations exceeded the standard for se-vere eutrophication in water body,which may lead to nitrogen and phosphorus enrichment in water through processes such as runoff.
Xiashan ReservoirSurface soilNitrogen and phosphorusLeaching characteristicsRelease prediction
万方数据
维普
