Fertilization Affects the Emission of CO2 and N2O in Hetao Irrigation Area

BAI Xueyuan; HONG Mei; YANG Yanming; GAO Fanshen; HUO Lixia; ZHANG Jianqiang

doi:10.13522/j.cnki.ggps.2017.07.012

Abstract：Impact of fertilization on greenhouse emission in Hetao Irrigation District was investigated in this pa-per. Four treatments were examined:slowly controlled releasing fertilizers (HK), organic fertilizer (F), microbial fertilizer (W) and business as usual (CK) from May to October in 2015. The emission of CO2 and N2O from a maize field was measured using static chamber gas chromatography to investigate the potential greenhouse gas emissions and temperature change at soil surface. The result revealed that ①N2O emission peaked in all treat-ments 10 days after applying N fertilizer. HK had the lowest while F had the highest emission rate during the whole growing season. N2O emission from F treatment was 62.40％higher than that from CK, whereas the N2O emission from CK was 19.71％ and 54.26％ higher than that from W and HK treatments respectively.②There were a significant difference in CO2 emission between the treatments, with W having the lowest emission and F the highest. CO2 emission from the CK was 16.75％higher than that from W.③The increase in soil-surface tem-perature under different treatments was in the order of HK<W<CK<F. We also found that the yields under HK and F treatments were comparable to that in the CK, but the greenhouse gas intensity (GHGI) in the HK and F was 96％and 170％of that in the CK respectively. GHGI in W treatment was high, but its yield was low com-pared with those in the CK. Applying organic fertilizers increased the emission of greenhouse gases. Our results showed that HK gave a high yield and low GHGI, and is efficient in promoting food production without increas-ing greenhouse gas emission.