NPP BOREAL FOREST: KUUSAMO, FINLAND, 1967-1971

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. NPP data are available on-line from the ORNL Distributed Active Archive Center, Oak Ridge National Laboratory, Oak Ridge, Tennessee, U.S.A. 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）数据库收录了来自已发表文献及其他现存数据源的全球陆地样地NPP实测记录，所有数据均经规范化文档留存。该数据库包含各强化研究样地的生物量动态、气候及样地特征数据，所有点位均附有地理坐标信息。
本数据整合工作的核心目标之一，是采用统一、规范且文档完备的方法，基于野外实测数据估算NPP。数据库的其他重要组成部分包括各研究样地的数据摘要、研究者联系方式及关键参考文献列表。我们已尽可能联系原始首席研究员或其继任者，对数据及配套文档进行审核。
目前，NPP数据库收录了超过60个强化研究样地的详细数据。其中绝大多数样地为草地，剩余样地涵盖热带森林、寒温带森林及冻原研究样地。所有样地均提供组合数据集，包含地上年际最大活体生物量数据及/或季节尺度生物量动态数据；多数样地还附带地下生物量及/或周转速率相关数据。若有可用数据，各研究样地的NPP估算值将纳入单样地记录及NPP摘要表格中。所有样地均提供不同详细程度的气候与土壤数据。
研究样地已根据基于以下植被分区体系绘制的植被图进行分类：贝利生态区（Bailey Ecoregions）、霍尔德里奇生命带（Holdridge Life-Zones）、马修斯植被分类系统（Matthews Vegetation Classes）及奥尔森全球生态系统复合体（Olson World Ecosystem Complexes）。
数据库同时提供此前整合的带地理坐标的多样地NPP估算数据集。目前有多套独立数据集可提供NPP估算值，涵盖超过1700个样地，但相较于强化研究样地，每个单样地附带的可用信息相对有限。此类样地的记录通常包含NPP数值、经纬度、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。
有关整个净初级生产力项目的更多信息，可访问NPP官方主页，该页面提供各研究样地及多样地数据集的详细内容链接。欢迎用户浏览相关网页，以获取原始研究、方法学及原始研究者联系方式的详细信息。
NPP数据集可通过美国田纳西州橡树岭国家实验室分布式主动存档中心（ORNL Distributed Active Archive Center, Oak Ridge National Laboratory, Oak Ridge, Tennessee, U.S.A.）在线获取。
数据引用规范：请按照以下格式引用本数据集：作者，P.A.，及作者，M.B. 年份。数据集名称。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. 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。