March 2003 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 2003. 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.

2003年3月，在低潮期调查期间，研究人员于10个GCE-LTER采样站点及其邻近区域的表层水体下方，采用尼斯金采水器（Niskin bottle）或手动方式采集水样。研究人员利用光合测定仪（photosynthetron）装置，测定了放射性标记碳酸氢盐在不同光照梯度下的同化速率。基于上述测量结果构建的光合-光强（P-I）曲线，将与藻类生物量以及光合有效辐射（Photosynthetically Active Radiation，PAR）随深度变化的观测数据相结合，用于估算各GCE-LTER采样站点水体中的瞬时总初级生产量。本研究属于GCE-LTER水文监测计划的组成部分，将按季度重复开展。