Arctic Vegetation Plots on Unalaska Island, Aleutian Islands, Alaska, 2007

This data set provides environmental, soil, and vegetation data collected during August 2007 from 69 study plots at the Unalaska Island research site, and one plot on Amaknak Island. The study sites are within the eastern Aleutian Islands, Alaska, USA. Data includes the plot information for vegetation, soils, and site characteristics for the study plots subjectively located in 11 plant communities that occur in six broad habitat types. Specific attributes include: dominant vegetation species and cover, soil chemistry, moisture, organic matter, topography, and elevation. Cover-abundance was estimated for all vascular plants, bryophytes, and macrolichens according to the nine-point ordinal scale of Westhoff and van der Maarel (1973).

本数据集收录了于2007年8月从美国阿拉斯加东部阿留申群岛的Unalaska Island研究站及其附属的Amaknak Island上的69个研究样地采集的环境、土壤和植被数据。研究区域位于美国阿拉斯加的广袤栖息地类型之中。数据内容涵盖了植被、土壤及研究样地的主观定位在11种植物群落中的场地特征信息。具体属性包括：优势植被物种及覆盖度、土壤化学成分、湿度、有机质、地形和海拔。所有维管植物、苔藓植物和大型地衣的覆盖丰度均根据Westhoff和van der Maarel（1973年）提出的九点序数量表进行估算。