摘要
根据土壤氮素解吸模型,通过盆栽试验研究解吸特征参数对土壤渗漏水硝态氮浓度的影响.结果表明:土壤氮素可解吸量Q、土壤溶液氮初始浓度Cli和C1/比值与土壤渗漏水硝态氮浓度呈非线性关系,在较低氮解吸特征值时则呈线性关系,由此提出“双速率转折点”概念评价土壤硝态氮流失潜能.当耕层土壤氮素解吸特征值超过“双速率转折点”X0时,硝态氮浓度的增加速率将以非线性形式迅速提高,反之将稳定在较低水平.
With pot experiment and soil nitrogen desorption model, this paper studied the characteristics of nitrogen desorption in vegetable garden soil, and their effects on the NO3^--N concentration of soil leachate. The results showed that soil leachate NO3^-N concentration had a non-linear relationship with the parameters Q, Cli and C1/λ of soil nitrogen, but the relationship became linear when these eigenvalues were relatively low. A conception of bi-curve cross point was put forward to assess the soil NO3^--N loss potential. When the eigenvalues were higher than the bi-curve cross point X0, the NO3^- -N concentration in soil leachate would be increased rapidly in non-linear form, while on the contrary, the increase would be maintained at a lower level.
出处
《应用生态学报》
CAS
CSCD
北大核心
2007年第1期94-100,共7页
Chinese Journal of Applied Ecology
基金
中国-加拿大合作福建项目和加拿大钾磷肥研究所资助项目(Fujian-13).
作者简介
颜明娟，女，1969年生，助理研究员．主要从事植物营养与平衡施肥研究，发表文章10余篇．Tel：0591-87573652；E-mail：yanmj163@163．com
通讯作者．E—mail：Zhangmq2001@163．com
