Effect of elevated CO2 and N fertilization on chemical properties and element retention of soil organic matter in agricultural soil

研究了增施CO2和N肥对土壤有机质化学性质和周转速率的影响。二氧化碳浓度升高会增加土壤中有机化合物的浓度。施氮量越高，有机氮化合物含量越高。CO2浓度的升高和氮肥的增加可能通过增加土壤中易分解有机质的含量来提高土壤肥力，土壤中酚酸的碳周转率受CO2浓度的影响显著，而受施氮量的影响不大。检出酚酸、苯酚、香草醛、对羟基苯甲酸、香草酸、乙酰香草酮、丁香醛、丁香酸、阿魏酸。醚化酚酸比酯化酚酸具有更高的转化率。

The effects of elevated CO2 and N fertilization on chemical properties and turnover rates of soil organic compound were investigated. Elevated CO2 increased concentration of organic compounds in the soil. Higher rate of N fertilization also increased organic N compounds. Elevated CO2 and higher N input may improve soil fertility by increase of easily-decomposable organic matter.Carbon turnover rates of phenolic acids in the soil were affected with CO2 concentration markedly, but they were little affected with rate of N fertilization. As phenolic acids, phenol, Vanillin, 4-Hydroxybenzoic acid, Vanillic acid, Acetovanillone, Syringaldehyde, Syringic acid, Ferulic acid were detected. Ether-linked phenolic acids showed higher turnover rate than Ester-linked one.