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采用土壤淤浆方法对丹麦农田和山毛榉森林土壤反硝化过程中N2 O的产生与还原进行了研究 ,同时考察了硝酸根和铵离子对反硝化作用的影响 .结果表明 ,森林土壤反硝化活性大于农田土壤 ,但农田土壤中N2 O还原活性大于森林土壤 ,表现在农田和森林土壤中N2 O/N2 的产生比率分别为 0 .11和 3 .65 .硝酸根和铵离子能促进两种土壤中的N2 O产生 ,但可降低农田土壤中的N2 O还原速率 .与农田土壤相比 ,硝酸根可降低森林土壤N2 O的还原能力 ,而铵离子却表现出对N2 O还原的促进作用 .培养 1周内尽管农田土壤中硝酸根始终存在 ,但几乎所有产生的N2 O都被还原成N2 .然而 ,只有当硝酸根几乎耗尽 ,森林土壤中N2 O的还原才开始进行 .由于两种土壤 pH值的不同造成硝酸根对N2 O还原抑制作用的差异 ,因为酸性条件下硝酸根对N2O还原的抑制较强 .因此 ,土壤消耗大气N2 O的适宜条件为厌氧 ,pH中性和硝酸根含量低 .
The soil slurry was used to study the production and reduction of N2O during denitrification of farmland and beech forest in Denmark. The effects of nitrate and ammonium on denitrification were also studied. The results showed that the denitrification activity of forest soil was greater than However, the activity of N 2 O reduction in farmland soil was greater than that of forest soils, and the ratio of production of N 2 O / N 2 to farmland and forest soil was 0.11 and 3.65, respectively. Nitrate and ammonium ion promoted But can reduce the rate of reduction of N 2 O in farmland soil.Compared with farmland soil, nitrate can reduce the reduction ability of forest soil N 2 O, while ammonium ion has a promoting role on the reduction of N 2 O. Although soil nitrate in the farmland was always present within 1 week, almost all of the generated N 2 O was reduced to N 2. However, reduction of N 2 O in forest soil was only started when nitrate was nearly depleted. Since both soil The difference of pH value caused the inhibition effect of nitrate on the reduction of N 2 O because the nitrate inhibited the reduction of N 2 O under acidic conditions.Therefore, the suitable conditions for soil to consume atmospheric N 2 O Oxygen, pH-neutral and low nitrate content.