秸秆不同处理方式对土壤氮磷吸附特性的影响

为探讨秸秆不同处理方式对土壤氮磷吸附特性,将破碎秸秆、腐熟秸秆和秸秆炭添加到模拟施肥的土壤中,研究了秸秆还田后对土壤氮磷吸附特征的影响。结果表明,不同处理的秸秆添加土壤对铵态氮吸附速率和吸附量大小均为秸秆炭破碎秸秆腐熟秸秆;对磷酸根吸附速率和吸附量大小均为秸秆炭破碎秸秆,腐熟秸秆对磷酸根负吸附。Freundlich方程能更好的描述铵态氮和磷酸根的吸附热力学过程,吸附动力学都符合伪二阶动力学方程。

Effects of different treatments on soil nitrogen and phosphorus adsorption characteristics

In order to study the adsorption characteristics of soil nitrogen and phosphorus in different treatments of straw, the crushed straw, rotten straw and straw charcoal added to simulated fertilization in soil, the effect of straw returning on soil nitrogen and phosphorus adsorption characteristics was studied. The results show that the addition of differently processed straws to soil showed different effects on ammonium absorption rates and amounts in the following order: straw charcoal > crushed straw > decomposition straw. As for the effect on phosphate effects and amounts, straw charcoal > crushed straw. The Freundlich model can better describe the thermodynamics of ammonium and phosphate adsorption, and adsorption dynamics all conform to pseudo-second order kinetic models.