Sediment properties in shallow waters around Tampa Bay, FL in July 2015

Sediments were collected in conjunction with infauna sampling at three sampling locations around Tampa Bay, FL in 2015 and analyzed for porosity of depth slices of 1 cm increments for the top 5 cm and 2 cm increments for 5-15 cm depth. C and N were measured at the USFSI Stable Isotope Lab, Department of Geology, University of South Florida, Tampa, using a Costech elemental combustion system, and data are given as total N (umol), total C (umol) and C:N ratio. Sediment grain size analysis was done using standard gravitational methods and is presented as % sand, silt, clay, and mud. Samples were collected in shallow water (0.25-1 m depth) in Halodule and Thalassia beds and adjacent bare (unvegetated) sediments.2015年，研究人员同步开展底内动物采样与沉积物样品采集工作，于美国佛罗里达州坦帕湾（Tampa Bay, FL）周边的3个采样点位完成采样。随后对沉积物孔隙度进行分析：表层0~5 cm深度段以1 cm为间隔制备切片测试，5~15 cm深度段则以2 cm为间隔制备切片测试。碳（C）与氮（N）的含量测定在南佛罗里达大学坦帕校区地质系USFSI稳定同位素实验室完成，测试采用Costech元素燃烧系统，最终数据以总氮（umol）、总碳（umol）及碳氮比（C:N）的形式给出。沉积物粒度分析采用标准重力法完成，结果以砂（sand）、粉砂（silt）、黏土（clay）及泥质（mud）的百分占比呈现。所有样品均采自水深0.25~1 m的浅水区，覆盖二药藻（Halodule）海草床、泰来草（Thalassia）海草床及其邻近的裸露（无植被覆盖）沉积物区域。