March 2004 surface water phytoplankton productivity for 10 Georgia Coastal Ecosystems LTER sampling sites

Water samples were collected by Niskin bottle or by hand from just beneath the surface during low tide surveys at or near 10 GCE-LTER sampling sites in March 2004. The incorporation of radiolabelled bicarbonate in response to varying levels of illumination was measured using a photosynthetron apparatus. Photosynthesis-irradiance (P-I) curves constructed from these measurements will be used in conjunction with algal biomass and PAR versus depth measurements to estimate instantaneous gross primary production in the water at each GCE sampling site. This study was part of the GCE-LTER hydrographic monitoring program, and will be repeated quarterly.

2004年3月，在10个GCE-LTER采样站点及其邻近区域的低潮调查中，研究人员采用尼斯金采水器（Niskin bottle）或手工方式采集了表层下方的海水样本。利用光合测定仪（photosynthetron）装置，测量了放射性标记碳酸氢盐（radiolabelled bicarbonate）在不同光照强度下的同化量。基于上述测量结果构建的光合-辐照度（P-I）曲线，将与藻类生物量及光合有效辐射（Photosynthetically Active Radiation, PAR）随深度变化的实测数据相结合，用于估算每个GCE-LTER采样站点所在水体中的瞬时总初级生产量。本研究属于GCE-LTER水文监测计划的一部分，后续将按季度重复开展。