NPP GRASSLAND: DICKINSON, U.S.A., 1970

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.本净初级生产力（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野外实测数据，所有记录均完成文档化整理。该数据库包含各强化监测样地的生物量动态、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、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还涵盖各研究样地的汇总信息、首席研究员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，对数据及相关文档进行校核。目前本数据库包含60余个强化监测研究样地的详细数据，其中绝大多数样地为草原样地，剩余样地涵盖热带森林、寒温带针叶林及苔原研究样地。所有样地均提供地上生物量相关数据，包括年度地上活体生物量峰值数据及/或季节尺度生物量动态数据的组合子集；多数样地还包含地下生物量及/或周转速率相关数据。若有可用数据，将为单个样地提供NPP估算值，并将其纳入NPP汇总表中。所有样地均提供不同详细程度的气候与土壤数据。本数据库依据基于贝利生态区（Bailey ecoregions）、霍尔特里夫生命带（Holdridge Life-Zones）、马修斯植被分类（Matthews vegetation classes）及奥尔森全球生态系统复合体（Olson World Ecosystem Complexes）的植被图对样地进行分组归类。数据库同时提供此前已汇编的多样地地理配准NPP估算数据集。多套不同数据集提供了NPP估算结果，涵盖1700余个样地，但相较于强化监测样地，每个单独样地的可用信息相对有限。这类样地的记录通常包含NPP数值、经纬度坐标、数据原始来源，部分样地还附带植被类型、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信息可访问NPP主页，主页中包含单个研究样地或多样地数据集的详细信息链接。我们鼓励用户浏览相关网页，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（Oak Ridge National Laboratory，简称ORNL）分布式主动存档中心在线获取。数据引用说明：请按照以下格式引用本数据集：作者，P.A.，与M.B.作者。年份。数据集名称。可从美国田纳西州橡树岭市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.，与J. Pitman. 1999. 草原NPP：英国比肯希尔，1972-1973。可从美国田纳西州橡树岭市橡树岭国家实验室分布式主动存档中心在线获取。