Zhang Wei, Han Yong-Jiao, He Hong-Bo, Xie Hong-Tu, Zhang Xu-Dong
State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110164, China.
Ying Yong Sheng Tai Xue Bao. 2012 Apr;23(4):1037-41.
A soil incubation test was conducted to study the quantitative changes of three amino sugars (glucosamine, muramic acid, and galactosamine) derived from microbes under drying and wetting cycle, and to analyze the relative contribution of soil bacteria and fungi to the turnover of soil organic matter by using the measured glucosamine/muramic acid ratio. Under continuous wetting, the degradation of bacteria-derived muramic acid was faster than that of fungi-derived glucosamine, and the degradation rate of galactosamine was the lowest. Drying and wetting cycle altered the degradation characteristics of the three amino sugars. As compared with that under continuous wetting, the degradation rate of bacteria-derived muramic acid at the prophase of drying and wetting was faster than that of fungi-derived glucosamine, and, with the increasing frequency of drying and wetting cycle, the degradation rate of fungi-derived glucosamine was faster than that of bacteria-derived muramic acid. These results indicated that drying and wetting cycle changed the course of the microbial transformation of soil amino sugar-derived nitrogen.
进行了一项土壤培养试验，以研究在干湿循环条件下源自微生物的三种氨基糖（葡萄糖胺、胞壁酸和半乳糖胺）的定量变化，并通过使用测得的葡萄糖胺/胞壁酸比率来分析土壤细菌和真菌对土壤有机质周转的相对贡献。在持续湿润条件下，源自细菌的胞壁酸的降解速度比源自真菌的葡萄糖胺快，而半乳糖胺的降解速度最低。干湿循环改变了三种氨基糖的降解特性。与持续湿润条件下相比，干湿前期源自细菌的胞壁酸的降解速度比源自真菌的葡萄糖胺快，并且随着干湿循环频率的增加，源自真菌的葡萄糖胺的降解速度比源自细菌的胞壁酸快。这些结果表明，干湿循环改变了土壤氨基糖衍生氮的微生物转化过程。
