Bulk Parameters for Soils/Sediments from the Shark River Slough and Taylor Slough, Everglades National Park (FCE), from October 2000 to January 2001

The main goal of this research is the characterization of the sources, transport and fate of soil/sediment organic matter in Everglades National Park, and the determination of future potential effects of Everglades restoration on the source strength and accumulation rates of this OM. The general approach of this study is the seasonal sampling and analysis of bulk and molecular characteristics of soil/sediment samples from the FCE-LTER sites. Bulk parameters measured are d13C, C/N and %OC, while molecular characterizations are based on detailed biomarker analyses of extractable lipids and CP/MAS 13C-NMR of bulk OM. Preliminary results have allowed to characterize OM source strength throughout the transects, as well as determining other minor OM sources, diagenetic differences based upon OM quality and marine influences in the estuarine areas of the FCE-LTER study area.

本研究的核心目标为表征大沼泽地国家公园（Everglades National Park）内土壤/沉积物有机质（soil/sediment organic matter, OM）的来源、运移过程与归宿，并探明大沼泽地修复工程对该有机质源强与堆积速率的未来潜在影响。本研究采用的总体方案为：对采自FCE-LTER研究样地的土壤/沉积物样品开展季节性采样，并分析其整体与分子层面特征。本次测定的整体参数包括δ¹³C值、碳氮比（C/N）以及有机碳百分含量（%OC）；分子特征表征则基于可提取脂质的详细生物标志物分析，以及总有机质的交叉极化/魔角旋转碳-13核磁共振（CP/MAS ¹³C-NMR）测试。目前已获得的初步结果，已完成整个样带内有机质源强的表征，同时明确了其他次要有机质来源、基于有机质品质的成岩作用差异，以及FCE-LTER研究区河口区域所受的海洋环境影响。