【摘要】 土壤有机质包含多种不同结构的有机物质,如碳水化合物(中性糖、氨基糖)、蛋白质(氨基酸)、木质素等,这些组分在土壤中的保留时间从几天到几百万年,在有机质循环过程中的积累和转化动态各有特征,其作用和贡献也有所不同。由于有机质各组分本身在土壤中稳定存在,只有利用同位素示踪技术才能定量研究有机质及其组分的循环动态。本文概述了利用稳定同位素示踪技术研究有机质中的一些重要组分的来源、可利用性和转化动态及其生物标识作用的进展情况,从而深入了解土壤有机质循环转化动态及调控机制。更多还原

【Abstract】 Soil organic matter(SOM) comprises a vast range of different organic constitutes with a mean residence time ranging from days to millennia.The individual components such as carbohydrates,protein and lignin play different roles in the accumulation and transformation of SOM,thus making different contributions to the cycling of soil carbon.Considering the stability of the components,isotope tracing technique is powerful to trace their dynamics in SOM turnover.A review was given in this paper on the origin,availability and transformation of some essential organic compounds in soil relied on stable isotope techniques.It would be helpful for a better understanding of the dynamics and mechanisms of SOM cycling.更多还原