Interaction Effect Of Maize Yield And Soil Greenhouse Gas Emission Under Reducing N Application And Intercropping Green Manure

With the increase of greenhouse gas emissions,global warming has intensified,and new requirements for greenhouse gas emission reduction have been made worldwide.Farmland soils are an important source of greenhouse gas emissions,effectively reducing greenhouse gas emissions from farmland soils.The inevitable requirements of development and ecological agriculture.In this experiment,the local intercropping model has the advantages of high yield and high efficiency,and combines the effect of green manure cultivation instead of some chemical fertilizers with the traditional wheat/maize intercropping model,and whether it can achieve a double-reduced ecology that reduces nitrogen fertilizer input and reduces greenhouse gas emissions.Further research in agriculture.We have three level of N fertilize:The traditional nitrogen application?N2?,reduce 25%nitrogen application?N1?and no nitrogen application?N0?.We still have three planting patterns:the solo maize?M?,maize intercropped vicia?M/V?and maize intercropping rape?M/R?,study the greenhouse gas emission patterns,crop yield and carbon discharge efficiency of different nitrogen application rates and planting patterns,and research on key determinants affecting greenhouse gas emissions,in order to reveal intercropping green manure The effect of reducing nitrogen application on greenhouse gas emission reduction in farmland soil.The main conclusions are as follows:?1?Intercropping of green manure increased the soil respiration rate during the symbiotic period of the maize/green manure intercropping system.The N₂O emission rate of soil is 10.7%-16.5%,and the intercropping of vicia can reduce the soil N₂O emission rate by 5.6%-11.1%.The intercropping of green manure had no significant effect on the total N₂O emissions.?2?Intercropping of green manure will result in a decrease in grain yield of corn farmland.The dry matter accumulation rate of the maize intercropping green manure population was 6.7%-19.1%higher than that of the single crop corn.The nitrogen fertilizer partial productivity based on energy yield was intercropped with vicia.The carbon discharge efficiency based on energy yield is the highest in maize intercropping with pea pea N1,which is 1.5%-16.3%higher than other treatments..?3?The content of inorganic nitrogen in soil is greatly affected by nitrogen application rate.The topdressing of crops during the growth period of crops will lead to a sharp increase in soil inorganic nitrogen content in a short period of time.Green manure will lead to an increase in soil inorganic nitrogen content,and after green manure is pressed,intercropping The average content of soil error was higher than that of single cropping;the soil moisture responded highly to the planting pattern,and the soil moisture content of the soil before the green manure was lower than that of the single crop,the green manure was pressed,and the intercropped soil was treated.There was no significant difference between the pore water content and the single crop corn treatment.Crop population structure is the main reason affecting soil temperature.?4?Soil respiration was mainly affected by soil temperature,water and crop growth,and different ecological factors were related to it.Among them,crop growth had the greatest impact on soil respiration rate;soil N2O emission was most affected by soil nitrogen content,soil temperature Water,and crop growth have an impact on it,but the correlation is low.