脲酶抑制剂氢醌对土壤脲酶活性,氨挥发和硝化的抑制动态

1.氢醌对土壤脲酶活性的抑制率及其持续的时间同氢醌浓度成正相关,与土壤脲酶活性成负相关。2.氢醌能有效地抑制施入土壤中尿素氨的挥发,而对铵盐和尿素的硝化强度产生强烈抑制。3.在麦秸还田土壤中,由于脲酶活性增高而提高了施入尿素的水解速度,故需提高氢醌用量;但由于麦秸的“氮因子效应”又固定了尿素分解产物及其氧化产物,从而弥补了氢醌失效后可能造成氮素的继续损失。

The Restrain Dynamic of Urease Activity and Volatilization and Nitrification of Ammonia in Soil by Urease Onhibitor-hydroquinone

The restraining rate and lasting time to soil urease activity by hydro-quinone has positive correlation with the HQ strength and negative correlation with the soil urease activity. HQ can effectively restrain the volatilization of ammonia been dressed in soil and produce strong restraint to the nitrification strength of urea and ammonium salt.In soil dressed wheat stem, as urease activity is increased, the hydrolysis speed of urea that be dressed into soil is accelerated, so the usease of HQ should be added. While as the N factor effect of wheat stem, the catabolite and oxidized product of urea are fixed, thus the possible urea loss continued after the Hq become invalid is made up.