[Objective]To explore the effects of degradable mulch film mulching on runoff and loss of dissolved nitrogen and phosphorus.[Methods]Polyethylene film mulching(PF)with a thickness of 0.003 mm,degradable film mulching with a thickness of 0.006 mm(BF1),0.008 mm(BF2),0.010 mm(BF3)and 0.012 mm(BF4),and no mulch(CK)were set up.In in-situ runoff plots,using mulching on ridge tillage peanut planting as the study object,the runoff and concentration of ammonium nitrogen(NH4—N),nitrate nitrogen(NO3-—N),and available phosphorus(PO43-—P)in runoff under natural rainfall conditions were measured,and the runoff and nutrient loss characteristics under different thickness of degradable mulch film were analyzed.[Results](1)The degradation time of degradable film increased with the increase of film thickness.(2)The order of cumulative runoff was BF1＜BF2＜BF3＜PF＜CK＜BF4,and there was significant difference between BF1 and BF4(p＜0.05).(3)Compared with CK,different film mulching can reduce the cumulative loss of nitrogen and phosphorus to varying degrees.BF1 had the most significant effect on reducing the loss of NH4+—N and NO3-—N,while BF2 had the most significant effect on reducing the loss of PO43-—P.(4)Among the five laminating treatments,the NO3-—N and PO43-—P loss in BF4 treatment was the highest,while the NH4+-N loss in BF3 treatment was the highest.[Conclusion]The research results can provide a theoretical basis for the prevention and control of water,soil,and nutrient loss in sloping farmland mulching with plastic film and solving the problems of agricultural non-point source pollution,and have important significance for green agricultural development and ecological sustainable development.
关键词
降解地膜厚度/自然降雨/径流/溶解态氮磷流失
Key words
thickness of degradation film/natural rainfall/runoff/loss of dissolved nitrogen and phosphorus
维普
万方数据