Global dataset of nitrogen fixation rates across inland and coastal waters based on a coordinated synthesis effort

Biological nitrogen fixation converts inert di-nitrogen gas into bioavailable nitrogen and can be an important source of bioavailable nitrogen to organisms. This dataset synthesizes the aquatic nitrogen fixation rate measurements across inland and coastal waters. Data were derived from papers and datasets published by April 2022 and include rates measured using the acetylene reduction assay (ARA), 15N2 labeling, or the N2/Ar technique. The dataset is comprised of 4793 nitrogen fixation rates measurements from 267 studies, and is structured into four tables: 1) a reference table with sources from which data were extracted, 2) a rates table with nitrogen fixation rates that includes habitat, substrate, geographic coordinates, and method of measuring N2 fixation rates, 3) a table with supporting environmental and chemical data for a subset of the rate measurements when data were available, and 4) a data dictionary with definitions for each variable in each data table. This dataset was compiled and curated by the NSF-funded Aquatic Nitrogen Fixation Research Coordination Network (award number 2015825).

生物固氮（Biological nitrogen fixation）可将惰性氮气转化为生物可利用态氮，是生物体获取生物可利用氮的重要来源之一。本数据集整合了内陆与近岸水域的水生固氮速率实测数据。数据来源于2022年4月前发表的文献与数据集，涵盖采用乙炔还原法（acetylene reduction assay, ARA）、15N2标记法或N2/Ar技术测定的固氮速率。本数据集包含来自267项研究的4793条固氮速率实测数据，共分为四个数据表：1）参考文献表，收录数据来源信息；2）固氮速率表，包含生境、基质、地理坐标及固氮速率测定方法等信息；3）配套环境与化学数据表，针对部分可获取配套数据的速率实测项提供相关环境及化学参数；4）数据字典表，对各数据表中的所有变量进行定义说明。本数据集由美国国家科学基金会（National Science Foundation, NSF）资助的水生固氮研究协调网络（项目编号：2015825）编制并质控。