The Role of Organic Phosphorus in Nutrient Cycling, Early Diagenesis and Burial of Refractory Organic Matter

该项目旨在解决海洋沉积有机磷化合物的组成、结构和循环信息的不足。分离可溶性有机磷的标准方法与不溶性有机磷大分子组分的分析热解相结合，色谱（HPLC， GC）和直接光谱（31P-NMR，MS）方法表征海洋孔隙水和沉积物中的有机磷化合物。化学结构和组成决定了有机磷化合物在微生物介导的降解中是不稳定的还是难降解的，并控制了沉积有机磷进入水柱的再循环。因此，组成和化学结构将在很大程度上控制难熔有机磷的最终埋藏速率。基于组成有机磷化合物的详细成分/结构信息，构建沉积有机磷储层的物质平衡，将有助于记录不稳定有机磷储层与难降解有机磷储层的再矿化情况。

This project is designed to redress the scarcity of information on the composition, structure and cycling of compounds of marine sedimentary organic-P. Standard methods for isolating soluble organic-P are being coupled with analytical pyrolysis of the insoluble macromolecular fraction of organic-P, chromatographic (HPLC, GC) and direct spectroscopic (31P-NMR,MS) methods to characterize organic-P compounds in marine pore waters and sediments. Chemical structure and composition dictate whether organic-P compounds are labile or refractory with respect to microbially mediated degradation, and control recycling of sedimentary organic-P into the water column. Composition and chemical structure will therefore, in large part, control the ultimate burial rate of refractory organic-P. Construction of a material balance for the sedimentary organic-P reservoir based on detailed compositional/structural information of constituent organic-P compounds will permit documentation of the remineralization of the labile versus the refractory organic-P reservoirs.