NPP MULTI-BIOME: GLOBAL PRIMARY PRODUCTION DATA INITIATIVE PRODUCTS

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，以下简称NPP）数据库收录了从已发表文献及其他现存数据源整合得到的全球陆地样地NPP实地测量记录。该数据库包含各密集研究样地的生物量动态、气候及样地特征数据，且所有数据均已完成地理配准。本次数据汇编的核心目标之一，是采用统一且规范的标准化方法，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数据摘要、研究者联系方式，以及各研究样地的关键参考文献列表。我们尽可能联系了原始首席研究者或其继任者，以审核数据及配套文档。 截至目前，NPP数据库包含超过60个密集研究样地的详细数据。其中绝大多数为草地样地，剩余样地涵盖热带森林、寒温带森林及冻原研究样地。所有样地均可获取地上生物量年度峰值活体数据和/或季节性生物量动态数据的组合信息。多数样地还包含地下生物量和/或周转相关数据。若有可用数据，各研究样地的净初级生产力估算值将收录于NPP摘要表格中，并单独标注。所有样地均提供不同详细程度的气候与土壤数据。 研究样地已依据基于贝利生态区（Bailey ecoregions）、霍尔德里奇生命带（Holdridge Life-Zones）、马修斯植被分类（Matthews vegetation classes）以及奥尔森世界生态系统复合体（Olson World Ecosystem Complexes）的植被地图进行分组。本数据库同时提供此前汇编的已地理配准NPP估算多样地数据集。此类数据集包含来自1700余个样地的NPP估算值，但相较于密集样地，单个样地可获取的信息相对有限。此类样地的记录通常包含NPP数值、经纬度、数据原始来源，部分还包含植被类型、管理措施、土壤及局地气候相关信息。 关于整个净初级生产力项目的更多详情，可访问NPP官方主页，其中包含各研究样地或多样地数据集的进一步细节链接。欢迎用户浏览相关网页，以获取原始研究、研究方法及原始研究联系人的详细信息。NPP数据可通过美国田纳西州橡树岭市橡树岭国家实验室的ORNL分布式活动档案中心（ORNL Distributed Active Archive Center）在线获取。 数据引用规范：请采用以下格式引用数据集：作者, 姓名缩写. 年份. 数据集标题. 可从美国田纳西州橡树岭市橡树岭国家实验室分布式活动档案中心在线获取。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.