改性尿素对土壤N2O排放的影响

N2O是仅次于CO2和CH4的第三种温室气体,改性尿素是减少农田N2O排放的一种重要途径。通过室内瓶培养试验,研究几种改性尿素对旱田和稻田土壤N2O排放的影响,结果表明:当旱田土壤含水量较低(23%)时,NI(尿素 硝化抑制剂)的N2O减排效果最好,其次为FL(尿素 HQ DCD)。当旱田土壤含水量较高(34%)时,FL的N2O减排效果最好,其次为NI。当稻田土壤处于淹水状态时,MEI(包被尿素)的N2O减排效果最好,其次为FL。结果对农田选用优良改性尿素、环境保护和可持续发展具有指导意义。

The Effect of Modified Urea on N2O Release from Soils

Nitrous oxide(N2O) is the third green house gas(next to CO2 and CH4)and using the modified urea is an important way to reduce N2O release from cultivated land.The bottle culture test was carried out to investigate effects of different modified urea on N2O release from the upland and rice field.The results show that NI(urea plus nitrification inhibitor) is the best and FL(urea plus HQ plus DCD) is the better in the effect of reducing N2O release when the soil moisture of the upland is 23%,and FL is the best and NI is the better when the soil moisture of the upland is 34% in the effect of reducing N2O release,and MEI(coated urea) is the best and FL is the better in the effect of reducing N2O release when the rice field is flooded.Using quality modified urea is beneficial to environment protection and sustainable development.