气候变化领域集成服务门户

The effects of agricultural waste return on the emissions of greenhouse gases (CO2, N2O and CH4) from corn farmland in the black soil region of Northeast China and its potential to increase temperature were studied to provide a theoretical basis for formulating reduction measures of agricultural greenhouse gas emissions. This study was conducted at the Experimental Station of China Agricultural University in Quanyangou, Lishu County, Siping City, Jilin Province. Static greenhouse gas chromatography was used to monitor soil greenhouse gas fluxes under different fertilization measures, and the different fertilization treatments were analyzed for comprehensive differences in greenhouse effects among corn fields. The results showed that the average CO2 fluxes and total emissions in response to the straw return treatment were the highest, reaching 388.96 mg.m(-2).h(-1) and 14718.97 kg.hm(-2), respectively, and nitrogen topdressing fertilizer significantly increased CO2 emissions. With respect to CH4 emissions, single fertilizer-treated plots had the highest average absorbed flux and total absorption-0.042 mg.m(-2).h(-1) and 1.36 kg.hm(-2), respectively, and with respect to N2O fluxes, the highest flux and , amount were 0.153 mg.m(-2).h(-1) and 5.75 kg.hm(-2), respectively. The global warming potential of the straw in situ treatment was significantly higher than that of the other treatments, and the global warming potential of the cattle manure treatment was lower than that of the single chemical fertilizer treatment, but the differences were not significant. Moreover, straw mulch increased CO2 emissions from black soils, and dry soils were shown to be important sinks of atmospheric CH4. Combinations of organic and inorganic fertilizers and individual fertilizers can reduce N2O emissions from soils. Therefore, to achieve higher corn yields and to reduce greenhouse gas emission intensities simultaneously, applications of organic and inorganic fertilizers constitute an ideal soil fertility method in the black soil region of Northeast China.