干旱区地理2025，Vol.48Issue(5)：801-811,11.DOI:10.12118/j.issn.1000-6060.2024.377
水氮耦合对河西灌区滴灌西瓜NH3和N2O排放的影响
Effects of water-nitrogen coupling on NH3 and N2 O emissions from drip-irrigated watermelon in the Hexi irrigation area
摘要
Abstract
NH3 and N2O emissions constitute the primary pathways of gaseous loss of nitrogen.Investigating the effects of differential water and nitrogen application rates under plastic-mulched drip irrigation on gaseous nitro-gen losses is crucial for developing scientifically informed water-fertilizer management strategies in watermelon production systems within the Hexi irrigation area in Gansu Province of China.Therefore,in this two-year field study,the experiment adopted a split-plot design,with main plots comprising three irrigation thresholds set at 80%(I80),65%(I65),and 50%(I50)of field capacity,while maintaining a uniform upper irrigation limit at 95%of field capacity.Subplot treatments consisted of four nitrogen application rates:0 kg·hm-2(N0),100 kg·hm-2(N100),200 kg·hm-2(N200),and 300 kg·hm-2(N300),on watermelon production under drip irrigation with a plastic mulch system.The experiment used aeration and static chamber-gas chromatography methods,the study analyzed soil NH3 and N2O emission dynamics,watermelon yield,and quality across treatments.The results showed that:(1)Soil nitrogen gas emissions are jointly affected by water and nitrogen.NH3 and N2O emissions reached their peaks 1-2 days after the application of base fertilizer and lasted for 5-7 days.The cumulative emis-sions were the highest in the seedling stage,accounting for 33.33%and 47.22%of the total growth period,respec-tively.The cumulative emissions of NH3 and N2O throughout the growth period were 3.05-15.39 kg·hm-2 and 0.51-2.00 kg·hm-2,respectively.(2)Increasing water and nitrogen supply rates will promote NH3 and N2O emis-sions.The effect of nitrogen is greater than that of irrigation.Under I80 conditions,the cumulative emissions of NH3 and N2O increased by 63.86%-285.48%and 120.41%-308.82%,respectively,when more nitrogen fertilizer was applied.(3)The nitrogen utilization rate of treatment I65N200 reached 32.62%,which was significantly high-er than that of treatment I80N300.The yield and soluble solids content were 70159 kg·hm-2 and 11.39%,respec-tively,which were not significantly different from treatment I80N300.Considering yield,quality,and nitrogen uti-lization rate comprehensively,when the soil moisture content is controlled between 65%and 95%of the maxi-mum field capacity in watermelon subsurface drip irrigation and the nitrogen application level is optimized to 200 kg·hm-2,high yield and quality can be maintained in watermelon systems within the Hexi irrigation area.This plastic-mulched drip irrigation strategy ensures yield-quality preservation while effectively mitigating NH3 and N2O emissions.关键词
西瓜/滴灌/水氮耦合/NH3排放/N2O排放Key words
watermelon/drip irrigation/water-nitrogen coupling/NH3 emission/N2O emission引用本文复制引用
薛亮,马忠明,赵安宇,罗双龙,薛莲,Muhammad Ali RAZA..水氮耦合对河西灌区滴灌西瓜NH3和N2O排放的影响[J].干旱区地理,2025,48(5):801-811,11.基金项目
国家现代农业产业技术体系建设专项(CARS-25) （CARS-25）
甘肃省现代农业科技支撑体系区域创新中心重点科技项目(2020GAAS02)资助 （2020GAAS02）
