【摘要】：在對(duì)比分析添加和未添加黑炭以及凍融和未凍融處理土柱淋出液中硝態(tài)氮濃度差異基礎(chǔ)上,考察研究了不同凍融條件(凍結(jié)溫度、凍結(jié)時(shí)間和融化時(shí)間)和氮素形態(tài)與含有黑炭土壤中硝態(tài)氮淋出效果之間的關(guān)系。結(jié)果表明,黑炭提高了土壤固持硝態(tài)氮的能力,凍融降低土壤固持硝態(tài)氮的能力,促進(jìn)了土柱中硝態(tài)氮的淋失。在添加KNO_3的土柱淋出液中硝態(tài)氮濃度最高,最大值達(dá)到96.80mg/L;而添加NH_4Cl的土柱淋出液中硝態(tài)氮濃度為最低。凍結(jié)溫度為-5℃和-25℃處理土柱淋出液中硝態(tài)氮的濃度相近,而且均高于凍結(jié)溫度為-15℃的硝態(tài)氮濃度。延長(zhǎng)凍結(jié)時(shí)間和融化時(shí)間均會(huì)使淋出液中硝態(tài)氮的濃度增高。
[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，

本文編號(hào)：2290934