Effects Of Slow Release Nitrogen Fertilizer On Ch₄and N₂O Emissions In Coastal Fields

CH4and N2O are two important greenhouse gas after CO2, they account for20%of the total contribution of all greenhouse gas and5%to7%contribution to global warming. And the warming potential of CH4and N2single molecule is much larger than CO2, they were approximately56times and280times of CO2. At the same time, they are participate in atmospheric photochemical reactions, such as the destruction of stratospheric ozone. Therefore, the increasing concentration of atmospheric CH4and N2O attract the attention of governments and scientists.This paper selected the Jerusalem artichoke improved coastal saline experimental field study on the application of different slow-release fertilizer under the soil CH4and N2O between the atmosphere exchange fluxes of different processing of CH4and N2O emission fluxes in order to evaluate andtraditional nitrogen management measures, the application of slow release fertilizers could reduce CH4and N2O caused by the greenhouse effect and its reduction potential.Calcium magnesium phosphate coated urea (CMCU), resin coated urea (PCU), sulfur coated urea (SCU) and urea-formaldehyde (UF), urea+nitrification inhibitor (U+DCD), urea+urine enzyme inhibitionagent (U+HQ) as the object of study to pass the field test observations of several slow release nitrogen fertilizer effects of saline land cultivation of Jerusalem artichoke CH4and N2O emissions reduction potential of in situ were selected in the study. The results showed that, in the observation period, compared with the urea treatment, PCU, SCU, CMCU UF four kinds of slow release nitrogen fertilizer were reduced by53%,79%,80%,65%of CH4emissions. Jerusalem artichoke growing season, application of U+DCD and U+HQ, UF processing soil than the application of ordinary urea N2O emissions were reduced by40%,37%and24%, the application of CMCU, SCU, PCU treated soil than with traditional the urea N2O emissions increased by5%,14%and35%. The test showed that some biochemical slow release nitrogen fertilizer could effectively reduce soil N2O emissions, and physical slow release nitrogen fertilizer on the corn field soil N2O emission reduction effect was not obvious. Biomass and yield data indicate that most of the slow release nitrogen fertilizer on the limited effect of Jerusalem artichoke biomass and yield enhance. PCU processing integrated greenhouse effect of CH4and N2O produced significantly higher than the urea treatment, SCU and CMCU with no significant difference in various chemical-based slow release nitrogen fertilizer showed a significant reduction effect, the application of the three chemicals slow CO2release fertilizer production unit weight of Jerusalem artichoke were less than the urea treatment.Jerusalem artichoke, corn and soybean growing season CH4and N2O fluxes in situ observations, the study used the2010Experimental selection, efficient slow release nitrogen fertilizer (urea+nitrification inhibitor+Urine inhibitor) on the cultivation of three kinds of cropssoil CH4and N2O emission reduction effects. The results showed that, in the observation period, compared with the urea control, Jerusalem artichoke Tian application of add inhibitors fertilizer processing can reduce25%of CH4emissions, while the addition of an inhibitor cornfield application fertilizer treatments reduced CH4emissions by11percent. The whole growing season, added a slow release nitrogen fertilizer made by nitrification inhibitors and urease inhibitors could reduce soil N2O emissions, compared with the processing facilities of ordinary urea, a17%reduction in the use of slow release nitrogen fertilizer N2O emissions from the Jerusalem artichoke, corn the use of slow release nitrogen fertilizer N2O emissions decreased by63%. Differences between the average N2O flux ordinary urea Jerusalem artichoke fields and the corn field soil average N2O flux between significant differences in corn urea N2O average flux59%higher than the Jerusalem artichoke, slow-release fertilizer processing two crops not significant. Soybean field application of nitrogen fertilizer, and therefore its N2O emissions were slower than the processing of the application of chemical fertilizers. The correlation analysis showed that the2011growing season each deal with CH4flux and soil temperature, and found no significant correlation between the water content of each treatment N2O fluxes and ground temperature and soil moisture was a significant positive correlation between this a conclusion was the same as the2010growing season results. The trial also found that the application of ordinary urea each treatment CH4and N2O generated by the greenhouse effect significantly higher than the urea treatment without fertilization treatments in the soybean field units greenhouse lowest.The results of the study that not only added a slow release nitrogen fertilizer and nitrification inhibitors and urease inhibitors could reduce the soil CH4and N2O emissions, but also pointed out that the higher yield of energy plant Jerusalem artichoke andbiomass makes the greenhouse gas production per unit of production was far less than other traditional crops of the saline-alkali soil, planting Jerusalem artichoke compared to other crops in the area of agricultural production was a relatively efficient.