脲酶抑制剂和硝化抑制剂的协同作用对尿素氮转化和N_2O排放的影响

Synergistic effect of urease inhibitor and nitrification inhibitor on urea-N transformation and N_2O emission

根据培养试验，论述了脲酶抑制剂氢醌和硝化抑制剂双氰胺和碳化钙的不同组合在土壤正常水分和渍水的条件下对于土中尿素的水解及其释出的氨的吸附、氧化和挥发以及Ｎ２Ｏ生成的影响．文章指出，配合使用氢醌和双氰胺既能延缓土中尿素的水解并使水解后释出的氨在土中得以更多和更长时间的保持，还能减少土中硝酸盐的累积、氨挥发的损失及Ｎ２Ｏ的生成．这表明在脲酶抑制剂和硝化抑制剂间可能存在一定的协同作用．很好利用这一作用，将有益于提高尿素肥效和减少其Ｎ损失与环境污染．

Based on incubation tests under normal soil water condition and waterlogging,this paper discussed the effect of different combinations of urease inhibitor hydroquinone and nitrification inhibitors dicyandiamide and calcium carbide on the hydrolysis of soil urea, the adsorption,oxidation and volatilization of its released ammonia.as well as the emission of produced N2O. It's indicated that hydroquinone in cooperation with dicyandiamide can both delay the hydrolysis of soil urea and make its released ammonia be conserved in soil witll more amount and longer period,and decrease the accumulation of soil nitrate, the loss of ammonia volatilization and the formation of nitrous oxide, which shows .that there probably exists a definite synergistic effect between urease inhibitor and nitrification inhibitor,and,to make full use of this effect will be beneficial to promote the efficiency of urea application and decrease the damage of its N loss and environmental pollution.