菜园土壤无机氮解吸特性对硝态氮流失潜能的影响  

Desorption characteristics of inorganic nitrogen in vegetable garden soil and their effects on soil NO_3～--N loss potential.

作　　者：颜明娟[1] 章明清[1] 陈子聪[1] 李娟[1] 林琼[1] 吴启堂[2] 熊德忠[3] 

机构地区：[1]福建省农业科学院土壤肥料研究所,福州350013 [2]华南农业大学资源环境学院,广州510642 [3]福建农林大学资源环境学院,福州350001

出　　处：《应用生态学报》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).

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.

关 键 词：土壤 硝态氮 流失潜能 双速率转折点 

分 类 号：S158[农业科学—土壤学] S63[农业科学—农业基础科学]