The effects of aeration and irrigation regimes on soil CO 2 and N 2 O emissions in a greenhouse tomato production system

Abstract Aerated irrigation has been proven to increase crop production and quality, but studies on its environmental impacts are sparse. The effects of aeration and irrigation regimes on soil CO 2 and N 2 O emissions in two consecutive greenhouse tomato rotation cycles in Northwest China were studied via the static closed chamber and gas chromatography technique. Four treatments, aerated deficit irrigation (AI1), non-aerated deficit irrigation (CK1), aerated full irrigation (AI2) and non-aerated full irrigation (CK2), were performed. The results showed that the tomato yield under aeration of each irrigation regime increased by 18.8% on average compared to non-aeration, and the difference was significant under full irrigation ( P 2 emissions compared to non-aeration, and treatment effects were significant in the autumn-winter season ( P 2 emissions in the two seasons was observed under full irrigation ( P >0.05). There was no significant difference between aeration and non-aeration in soil N 2 O emissions in the spring-summer season, whereas aeration enhanced N 2 O emissions significantly in the autumn-winter season. Furthermore, full irrigation over the two seasons greatly increased soil N 2 O emissions compared to the deficit irrigation treatment ( P 2 fluxes. Soil temperature, soil moisture and NO 3 − were the primary factors influencing N 2 O fluxes. Irrigation coupled with particular soil aeration practices may allow for a balance between crop production yield and greenhouse gas mitigation in greenhouse vegetable fields.