冻融作用对含有黑炭土壤中硝态氮淋失的影响

发布时间：2018-10-24 09:01

【摘要】：在对比分析添加和未添加黑炭以及冻融和未冻融处理土柱淋出液中硝态氮浓度差异基础上,考察研究了不同冻融条件(冻结温度、冻结时间和融化时间)和氮素形态与含有黑炭土壤中硝态氮淋出效果之间的关系。结果表明,黑炭提高了土壤固持硝态氮的能力,冻融降低土壤固持硝态氮的能力,促进了土柱中硝态氮的淋失。在添加KNO_3的土柱淋出液中硝态氮浓度最高,最大值达到96.80mg/L;而添加NH_4Cl的土柱淋出液中硝态氮浓度为最低。冻结温度为-5℃和-25℃处理土柱淋出液中硝态氮的浓度相近,而且均高于冻结温度为-15℃的硝态氮浓度。延长冻结时间和融化时间均会使淋出液中硝态氮的浓度增高。
[Abstract]:On the basis of comparing and analyzing the difference of nitrate nitrogen concentration in leached liquid of soil column with and without black carbon and freeze-thaw treatment, the different freezing and thawing conditions (freezing temperature) were studied. The relationship between freezing time and melting time), nitrogen forms and the leaching effect of nitrate in black carbon soil. The results showed that black carbon improved the ability of soil nitrate retention, freeze-thawing decreased soil nitrogen retention, and promoted the leaching of nitrate nitrogen in soil column. The concentration of nitrate nitrogen in the leaching solution of soil column added with KNO_3 was the highest, the maximum value was 96.80 mg / L, and the concentration of nitrate nitrogen in the leaching solution of soil column added with NH_4Cl was the lowest. The concentration of nitrate nitrogen in the leaching solution of soil column treated at -5 鈩，

本文编号：2290934