Plant community surveys along transects at multiple sites on Sapelo Island and St. Simons Island in Georgia during June and July 2005

I sampled 59 sites around Sapelo Island and St. Simons Island, Georgia, in June-July 2005. Sites were chosen to include a range of mainland, barrier island, and back-barrier hammock island locations. All sites were dominated by salt marsh plant species, primarily Spartina alterniflora. To provide a general indication of the salinity conditions prevailing at each site, I measured salinity of the nearest body of water with a refractometer on the date that the site was sampled. Plant richness was documented along a single 5.0m wide transect at each site. Each transect began at the lower elevational limit of vegetation and continued perpendicular to the water’s edge to the shrub community at the upper marsh border. Plant presence was noted in a series of nested subplots within a 1.0m x 5.0m plot at each meter along the transect. The results posted here are sites, position, salinity, and the composition of the plant community in 0.5 x 0.5 m quadrats located at 1 m intervals along the transect. This data set is a companion to PLT-GCET-0608, which provides pooled data for sites in Georgia.

本研究于2005年6月至7月，在佐治亚州萨佩洛岛（Sapelo Island）与圣西蒙斯岛（St. Simons Island）周边采集了59个样地的野外数据。样地选取覆盖了大陆沿岸、障壁岛以及后障壁岛林岛等多种生境类型。所有样地均以盐沼植物为优势类群，优势种主要为互花米草（Spartina alterniflora）。为表征各采样点的原位盐度条件，本研究于样地采样当日，使用折光仪（refractometer）测定了其邻近水体的盐度。本研究在每个样地沿一条宽度为5.0米的样带开展植物物种丰富度调查：每条样带均从植被分布的海拔下限处起始，垂直于水岸延伸至盐沼上部边界的灌丛群落。沿样带每米布设1.0m×5.0m的主样方，并在其中的一系列嵌套子样方内记录植物的出现情况。本次公开的数据集包含样地基本信息、空间位置、盐度数据，以及沿样带以1米间隔布设的0.5m×0.5m样方内的植物群落组成数据。本数据集为PLT-GCET-0608的配套数据集，后者包含佐治亚州各采样点的汇总数据。