与氮转化有关的土壤酶活性对抑制剂施用的响应

利用室内模拟培养试验，研究好气条件下施用尿素后土壤脲酶、脲酸还原酶、亚硝酸还原酶和羟胺还原酶活性对脲酶抑制剂氢醌（HQ）与硝化抑制剂包被碳化钙（ECC）和双氰胺（DCD）组合（HQ ECC、HQ DCD）的响应、结果表明，HQ DCD组合与其它抑制剂处理相比能更有效地降低土壤脲酶活性，增加硝酸还原酶、亚硝酸还原酶、羟胺还原酶活性，不同处理土壤脲酶、亚硝酸还原酶和羟胺还原酶活性与土壤NH4^ 、NO3^-、NH3挥发和N2O排放速率间存在不同形式的显著相关关系：土壤脲酶、亚硝酸还原酶和羟胺还原酶活性之间存在不同形式的显著正相关关系。

Response of N transformation related soil enzyme activities to inhibitor applications

With an aerobic incubation test,this paper studied the response of soil urease,nitrate reductase,nitrite reductase,and hydroxylamine reductase to urease inhibitor hydroquinone (HQ) applied in combination with nitrification inhibitor encapsulated calcium carbide (HQ+ECC) or dicyandiamide (HQ+DCD). The results showed that HQ+DCD could inhibit urease activity and increase activities of nitrate reductase,nitrite reductase,and hydroxylamine reductase significantly in comparison with CK,HQ and HQ+ECC. Under the condition of our test,there existed a significant relationship between soil urease,nitrate reductase,nitrite reductase,and hydroxylamine reductase activities and soil NH + 4 and NO - 3 contents,NH 3 volatilization and N 2O emission rate,and regression ana-lysis indicated that there were significantly positive relationships between soil urease,nitrite reductase and hydroxylamine reductase activities.