菜园土壤无机氮解吸特性对硝态氮流失潜能的影响

应用生态学报

菜园土壤无机氮解吸特性对硝态氮流失潜能的影响

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

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

收稿日期:2006-07-27 修回日期:2006-11-10 出版日期:2007-01-18 发布日期:2007-01-18

Desorption characteristics of inorganic nitrogen in vegetable garden soil and their effects on soil NO₃^-N loss potential

YAN Ming-juan¹;ZHANG Ming-qing¹;CHEN Zi-chong¹;LI Juan¹;LIN Qiong¹;WU Qi-tang²;XIONG De-zhong³

¹Institute of Soil and Fertilizer, Fujian Academy of Agricultural Sciences, Fuzhou 350013, China;
²College of Resources and Environmental Science, South China Agricultural University,
Guangzhou 510642, China;
³College of Resources and Environment Science, Fujian Agriculture and Forestry University,
Fuzhou 350001, China

Received:2006-07-27 Revised:2006-11-10 Online:2007-01-18 Published:2007-01-18

摘要/Abstract

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.

关键词: 水淹, 羊草草地, 地上生物量

Abstract: 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.

Key words: Flooding, Leymus chinensis grassland, Aboveground biomass

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. 菜园土壤无机氮解吸特性对硝态氮流失潜能的影响[J]. 应用生态学报.

YAN Ming-juan¹;ZHANG Ming-qing¹;CHEN Zi-chong¹;LI Juan¹;LIN Qiong¹;WU Qi-tang²;XIONG De-zhong³ . Desorption characteristics of inorganic nitrogen in vegetable garden soil and their effects on soil NO₃^-N loss potential[J]. Chinese Journal of Applied Ecology.

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