Characterization of phosphorus adsorption and risk of phosphorus release from black soil by returning straw to the field
By analyzing the effects of straw no-tillage(MG),straw mulching(FG)and straw deep turning(SF)on soil physicochemical properties and soil phosphorus adsorption characteristics,the effects of soil physicochemical properties on phosphorus adsorption characteristics were studied,and the release risk of phosphorus in soil was further analyzed.The results showed that the contents of soil organic matter and available phosphorus increased,and the bulk density of soil decreased after straw returning.Compared with no-tillage,the adsorption capacity of soil phosphorus was reduced by 20.1％after straw mulching and returning to the field,and the adsorption capacity of soil phosphorus after straw deep turning and returning to the field was reduced by 35.0％.The DPS(phosphorus saturation)in black soil under the three different tillage modes were MG:0.3％,FG:4.0％,SF:10.2％,PSI(phosphorus uptake index)were MG:41.14,FG:40.04,SF:36.09(mg P/(100g))/(μmol/L),and ERI(phosphorus release risk index)were MG:0.7％,FG:9.9％,and SF:28.3％,respectively.Straw mulching and deep straw returning can significantly increase soil organic matter,reduce soil phosphorus adsorption capacity,and improve soil phosphorus effectiveness,but also improve soil phosphorus adsorption saturation,which can easily cause the risk of phosphorus loss.
black soilstraw returning to fieldphosphorus adsorptionrelease risk
万方数据
维普
