Barro colorado plot data

The 50-hectare permanent tree plot was established in 1980 in the tropical moist forest of Barro Colorado Island (BCI) in Gatun Lake in central Panama. Censuses have been carried out in 1981-1983, 1985, 1990, 1995, 2000, and 2005. In each census, all free-standing woody stems at least 10 mm diameter at breast height were identified, tagged, and mapped. Over 350,000 individual trees have been censused over 25 years. http://ctfs.si.edu/datasets/bci/ is the location for more informaion on this data. Species abundance for each of the censuses of all free-standing woody plants in 50 ha of forest. http://ctfs.si.edu/datasets/bci/abundance/ is the location for more information on this data. Soil Maps of Barro Colorado Island 50 ha Plot - On this webpage you can find copies of soil maps showing the estimated concentrations (mg/Kg) of base cations, extractable P, and ammonium and nitrate for the BCI 50 ha Forest Dynamics Plot. Kriged estimates for the 20 x 20 m quadrats are available in this excel file. A copy of the protocol used for the sampling of the plot, collection and chemical analysis of soil samples is available here. http://ctfs.si.edu/datasets/bci/soilmaps/BCIsoil.html is the location for more information on this data/这片占地50公顷的永久性森林样地于1980年在巴拿马中部加通湖内的巴罗科罗拉多岛（Barro Colorado Island, BCI）的热带湿润森林中建立。该样地分别于1981-1983年、1985年、1990年、1995年、2000年及2005年开展森林普查。每次普查中，所有胸径（diameter at breast height）≥10 mm的独立木本茎干均完成物种鉴定、标签悬挂与位置测绘。25年间累计完成超过35万株个体树木的普查工作。 更多相关数据详情可访问：http://ctfs.si.edu/datasets/bci/。 本数据集涵盖该50公顷森林内所有独立木本植物各次普查的物种丰度数据。 相关丰度数据的更多详情可访问：http://ctfs.si.edu/datasets/bci/abundance/。 巴罗科罗拉多岛50公顷森林动态样地土壤图——本网页可获取该样地的土壤分布图，图中标注了盐基阳离子、可提取磷（P）、铵态氮与硝态氮的估算浓度（mg/Kg）。本Excel文件中提供了20×20米样方的克里金插值估算结果。该样地的土壤采样、样品采集与化学分析实验方案可在此处获取。 更多该土壤数据集的相关详情可访问：http://ctfs.si.edu/datasets/bci/soilmaps/BCIsoil.html。