土壤中反硝化酶活性变化与N2O排放的关系

研究施肥条件下，土壤反硝化酶活性硝酸还原酶（ＮＲ）活性、亚硝酸还原酶（ＮｉＲ）活性及羟胺还原酶（ＨｙＲ）活性在玉米生长季节中的变化及其与土壤含水量、硝态氮含量、Ｎ２Ｏ排放之间的关系．结果表明，３种还原酶都有明显的季节变化规律并受土壤水分含量及施肥的影响．通过研究３种反硝化酶活性与土壤含水量及Ｎ２Ｏ排放量之间的关系后指出，反硝化酶活性变化可作为一个区分旱田Ｎ２Ｏ产生途径的指标

Relationship between soil denitrifying enzyme activities and N 2O emission.

Studies of the activities of soil nitrate reductase, nitrite reductase and hydroxylamine reductase in maize growing season and their relationship with soil water content, NO - 3 content and N 2O emission under fertilization showed that these three denitrifying enzymes had a significant seasonal variation and were influenced by soil water content and fertilization. The relationship between soil denitrifying enzymes, soil water content and N 2O emission were further investigated, which indicated that the activities of soil denitrifying emzymes could be an index to distinguish the ways of N 2O productions in upland field.