Study On Efficient Utilization Of Water Fertilizer And Carbon Footprint Of Vegetable Oxygation

Oxygation is a new type of irrigation technology to coordinately deliver water,fertilizer,and gas to the soil in the crop root zone through an underground drip irrigation system.Oxygation improves soil aeration,increases soil's available oxygen content and aerobic microorganisms'number and activity,which in turn affects crop physiological growth and greenhouse gas?N₂O,CO₂,CH₄?emission processes,leading to crops as a carbon-fixing carrier The carbon sequestration capacity of the protected farmland ecosystem has changed.The effects of greenhouse gas emissions from vegetable soils under oxygen-enriched drip irrigation and its evaluation on the carbon sequestration capacity of greenhouse ecosystems can provide a scientific basis for revealing the contribution of this new type of irrigation technology to the integrated greenhouse effect and the carbon sequestration effect of facility farmland.In this study,a two-factor two-level test of nitrogen application rate?low nitrogen N1,normal nitrogen N₂?and dissolved oxygen amount?C:5ppm,A:15ppm?was set.The facility tomato cultivation test was adopted and monitored by gas chromatography-static box method system.Soil greenhouse gas?N₂O,CO₂,CH₄?emission fluxes and crop physiological growth status.Study on the aeration index of soil?aerated water porosity WFPS,soil effective dissolved oxygen DO,redox potential Eh,oxygen diffusion rate ODR?),Greenhouse gas?N2O,CO2,CH4?emissions flux,crop physiological growth and yield and fruit quality,explore the effects of oxygen-added drip irrigation on crop physiological growth,and analyze the contribution of different agricultural inputs to the integrated greenhouse effect of facility farmland At the same time,three methods including soil carbon pool emission method SBA,biomass emission method CBA,and soil and biomass emission method S&CBA were used to evaluate the carbon sequestration capacity of the farmland ecosystem of the facility.Main results were obtained as below:?1?Oxygation improves soil aeration and improves crop root growth environmentOxygation can significantly improve soil aeration and DO,ODR,and ORP of tomato soil in the facility.Among them,N₁A increased 8.71%,9.12%,and 9.35%?P<0.05?of the average soil DO,ODR,and ORP during the whole growth period of the N₁C treated crop?P<0.05?.The increase of nitrogen application had no significant effect on soil DO,ODR,and ORP;oxygen and nitrogen treatment had no significant effect on soil WFPS.?2?Oxygation promotes crop growthUnder the Oxygation,the greenhouse tomato root system vigor,chlorophyll and photosynthesis responded positively.Among them,N1A increased root vitality by10.16%compared with N₁C treatment,N₂A increased by 11.33%compared with N₂C treatment?P<0.05?;N1A increased chlorophyll content by 8.49%compared with N1C treatment,and N2A increased by 12.01%compared with N2C treatment?P<0.05?.?3?Oxygation improves crop water use efficiency and nutrient use efficiency,and realizes crop quality improvement and yield improvementIn the test,N₁A increased fruit yield by 18.94%compared with N₁C treatment,N₂A increased by 16.36%compared with N₂C treatment;N₁A increased by 10.14%compared with N₁C FPF,N₂A increased by 16.36%compared with N₂C treatment;N1A increased by 10.14%compared with N1C treatment WUE N2C treatment increased by 16.36%?P<0.05?.?4?Oxygation significantly affects greenhouse gas emissions from soil and the integrated greenhouse effect?NGWP?of farmland systems in facilitiesCompared with N₁C,N₁A and N₂C treated soils increased N₂O and CO₂ emissions by 29.76%and 10.72%,N2A and N2C treated soils increased by 35.74%and 5.71%.Increased by 132.26%?P<0.05?.By using three evaluation methods to evaluate NGWP under different treatments,it is known that under the CBA and S&CBA methods,N₁A is 28.29%and 19.46%higher than N₁C NGWP,and N₂A is 54.57%and 16.45%higher than N₂C;Under the evaluation of SBA method,N₁A was 13.14%lower than N₁C treatment NGWP,N₂A was 15.45%lower than N₂C treatment?P<0.05?.