秸秆粉构建隔离层方式对土壤氮磷淋溶阻控效应研究

Effect of Powered Straw Returning Method on Soil Nitrogen and Phosphorus Leaching Inhibition

为控制氮磷面源污染提供理论基础,研究了秸秆粉构建隔离层方式对土壤氮磷淋溶阻控效应。通过盆栽辣椒试验,设置空白对照(T1)、单层深埋(T2)、双层深埋(T3)、单层深埋+土壤混合(T4)、土壤混合(T5)五种处理,构建秸秆隔离层,在不同时间点取淋溶水,测试淋溶水中氮磷含量,明确不同秸秆构建隔离层方式对土壤氮磷淋溶的阻控效应。结果表明,T4明显比其他处理和对照表现出阻截氮磷淋溶效应的优势,全氮、总磷、有效磷、氨氮、硝态氮、亚硝态氮累积淋溶量分别比对照减少了50.6%、42.64%、25.8%、11.4%、65.6%、46.9%,同时增加辣椒生物量10.54%。四种处理均表现出阻截氮磷淋溶效应的趋势,但程度各有不同,具体应用到实际农业生产中还需进一步研究。

In order to study the resistance and control effect of straw powder construction isolation layer on soil nitrogen and phosphorus leaching,and to provide a theoretical basis for controlling nitrogen and phosphorus non-point source pollution,five treatments,including blank control(T1),single-layer deep burial(T2),double-layer deep burial(T3),single-layer deep burial+soil mixing(T4)and soil mixing(T5),were set through potted pepper test.The straw isolation layer was constructed,and leached water was taken at different time points to test the nitrogen and phosphorus content in leached water,and the inhibition effect of different construction methods of straw isolation layer on soil nitrogen and phosphorus leaching was determined.Compared with other treatments and control,T4 showed an obvious advantage in inhibiting the leaching effect of nitrogen and phosphorus.The cumulative leaching amount of total nitrogen,total phosphorus,available phosphorus,ammonia nitrogen,nitrate nitrogen and nitrous nitrogen was reduced by 50.6%,42.64%,25.8%,11.4%,65.6% and 46.9%,respectively,and the biomass of pepper was increased by 10.54%.All the four treatments showed a tendency to inhibit the leaching effect of nitrogen and phosphorus,but the degree was different.Its concrete application to actual agricultural production needs further research.