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（organic matter, 下文简称OM）的来源、运移过程与归趋，并明确大沼泽地修复工程对该OM的源强度与累积速率的潜在远期影响。本研究的通用研究方案为：通过季节性采样，分析FCE-LTER样点采集的土壤/沉积物样品的体相与分子特征。其中测定的体相参数包括δ¹³C、碳氮比（C/N）与有机碳百分含量（%OC）；分子表征则基于可提取脂质的精细生物标志物分析，以及总OM的交叉极化/魔角旋转13C核磁共振（CP/MAS ¹³C-NMR）测试。目前已获取的初步结果，不仅完成了研究样带内OM源强度的表征，还识别出其他次要OM来源，同时基于OM品质明确了成岩作用差异，并解析了FCE-LTER研究区域河口区域的海洋影响。