NPP BOREAL FOREST: SCHEFFERVILLE, CANADA, 1974

The NPP Database contains documented field measurements of NPP for global terrestrial sites compiled from published literature and other extant data sources. The NPP Database contains biomass dynamics, climate, and site-characteristics data georeferenced to each intensive site. A major goal of the data compilation is to use consistent and standard well-documented methods to estimate NPP from the field data. Other important components of the database include a summary, investigator contact information, and a list of key references for each site. As far as possible, the original principal investigator or his/her successor has been contacted to review the data and documentation. The NPP Database currently contains detailed data for over 60 intensive study sites. A majority of these sites are grasslands, the remainder being tropical forests, boreal forests, and tundra study sites. Some combination of above-ground annual peak live biomass data and/or seasonal biomass dynamics data are available for all sites. Many sites also have data on below-ground biomass and/or turnover. Estimates of net primary productivity are included, where available, for individual sites, and as part of the NPP Summary tables. Climate and soils data are available for all sites in varying degrees of detail. The sites have been grouped according to vegetation maps based upon Bailey ecoregions, Holdridge Life-Zones, Matthews vegetation classes, and Olson World Ecosystem Complexes. Previously compiled multi-site data sets of georeferenced NPP estimates are also provided. NPP estimates are available from a number of different collections, containing more than 1700 sites but with less information available for each individual site as compared to the intensive sites. Records for these sites typically include an NPP value, latitude and longitude, original source of the data, and sometimes information on vegetation type, management, soils, and local climate. More information on the entire Net Primary Productivity Project can be found at the NPP home page, with links to further details on individual study sites or multi-site collections. Users are encouraged to browse these Web pages to find details of original studies, methodologies, and original research contacts Data Citation: Cite the data sets using the following reference format: Author, P. A., and M. B. Author. Year. Data Set Title. Available on-line from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A. For example: Williamson, P., and J. Pitman. 1999. NPP Grassland: Beacon Hill, U.K. 1972-1973. Available on-line from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A.净初级生产力（Net Primary Productivity，简称NPP）数据库收录了源自已发表文献及其他现存数据源的全球陆地站点NPP实地测量记录。该数据库包含各密集观测站点的生物量动态、气候及站点特征数据，并已完成地理配准。 本数据汇编的核心目标之一，是采用统一规范且记录完备的方法，基于实地观测数据估算NPP。数据库的其他重要组成部分包括各站点的概况、研究者联系方式，以及关键参考文献列表。研究团队已尽可能联系原始首席研究员或其继任者，对数据及相关文档进行审核。 截至目前，NPP数据库共收录60余个密集研究站点的详细数据。其中绝大多数为草地生态系统站点，剩余站点涵盖热带森林、寒带森林及苔原研究样地。所有站点均提供地上部分年度峰值活生物量数据和/或季节性生物量动态数据的组合内容；多数站点还包含地下生物量及/或周转速率相关数据。 若有可用数据，各站点的NPP估算值已纳入记录，同时也会体现在NPP概况表中。所有站点均提供了不同详细程度的气候与土壤数据。 本数据集依据贝利生态区（Bailey ecoregions）、霍尔德里奇生命地带（Holdridge Life-Zones）、马修斯植被分类（Matthews vegetation classes）以及奥尔森世界生态系统复合体（Olson World Ecosystem Complexes）等植被地图进行了分组归类。 此外，数据库还提供了此前汇编的多站点地理配准NPP估算数据集。这类数据集包含1700余个站点，但相较于密集观测站点，单个站点可获取的信息相对有限。这类站点的记录通常包含NPP估算值、经纬度坐标、数据原始来源，部分还附带植被类型、管理措施、土壤及局地气候相关信息。 如需了解整个NPP项目的更多详情，可访问NPP主页，其中包含各单个研究站点或多站点数据集的进一步细节链接。欢迎用户浏览这些网页，以获取原始研究、研究方法及原始研究联系人的相关信息。 数据引用规范：请按照以下格式引用本数据集：作者, 姓名缩写. 年份. 数据集标题. 可从美国田纳西州橡树岭国家实验室分布式主动存档中心在线获取。 示例：Williamson, P., and J. Pitman. 1999. NPP Grassland: Beacon Hill, U.K. 1972-1973. Available on-line from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A.