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

研究了CO2和N施肥对土壤有机质化学性质和周转速率的影响。升高的二氧化碳增加了土壤中有机化合物的浓度。较高的施氮量也增加了有机氮的含量。高CO2和高N输入可通过增加易分解有机质提高土壤肥力。土壤酚酸碳周转速率受CO2浓度影响显著，但受施氮量影响不大。对酚类酸、苯酚、香兰素、4-羟基苯甲酸、香草酸、乙酰香草酮、丁香醛、丁香酸、阿魏酸进行检测。醚连接的酚酸比酯连接的酚酸具有更高的周转率。

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.