Effects of Fertilization Rate on Forage Oat Yield and Soil Organic Carbon Pool Turnover
In order to study the regulatory effect of nitrogen application on soil carbon turnover,and to deeply understand how to bal-ance the relationship between nitrogen reduction measures and soil nutrient improvement in the process of artificial grassland cultiva-tion,and to achieve the purpose of reducing carbon emissions.Four nitrogen application gradients were selected during oat planting,and the yield was measured after harvest.After harvest,the soil was taken back to the soil for cultivation and mineralization in the lab-oratory using a controlled experiment.The turnover of two carbon pools,active and chronic,was simulated by mineralization data to explore the effect of fertilizer application on soil organic carbon pools in forage oat cultivation.The results showed that nitrogen appli-cation would promote the activation of organic carbon in the soil and increase the cumulative mineralization of soil organic carbon while increasing the yield of forage oats.Low nitrogen and medium nitrogen treatments(nitrogen content in the range of 75.98～82.32 g·kg-1)could achieve the purpose of ecological carbon reduction while increasing the yield of forage oats.Fertilization activated the turnover of soil carbon pools.With the increase of fertilizer application gradient,the turnover rate of active carbon pool increased.Low nitrogen and medium nitrogen treatments promoted the formation of chronic carbon pools in soil organic carbon and reduced the cumu-lative mineralization of soil organic carbon.This study provides a scientific basis for the precise fertilization of artificial grasslands to achieve the goal of improving production efficiency and reducing carbon emissions.In summary,the appropriate amount of nitrogen application increase the yield of forage oats while reducing the cumulative mineralization of soil organic carbon.
万方数据
维普
