Greetings from the Powell Center: Your browser is currently running on Internet Explorer (IE) 8 or lower version. To better view this Web site we recommend updating your browser to the most current IE Version.

John Wesley Powell Center for Analysis and Synthesis

Powell Center Working Group Project Information
Novel multiā€scale synthesis of nitrogen fixation rates and drivers across the terrestrial biosphere

Principal Investigator(s):
Steven Perakis (USGS Corvallis Research Group, FRESC)
Duncan Menge (Columbia University)
Christopher Clark (U.S. Environmental Protection Agency)
Sasha C Reed (Canyonlands Field Station, SBSC)

Award Date: 2019 
Title: Nitrogen Fixation - landscapeTitle: Nitrogen Fixation - nodules

Biological nitrogen fixation (BNF) is a critical biogeochemical process that converts inert atmospheric N2 gas into biologically usable forms of the essential nutrient nitrogen. A variety of free-living and symbiotic organisms carry out BNF, and in most regions worldwide, BNF is the largest source of nitrogen that fuels terrestrial ecosystems. As a result, BNF has far reaching effects on ecosystem properties (water quality, carbon storage), sustainability (plant growth, soil fertility), and the global climate system. Despite this cross-cutting importance, existing syntheses of BNF have major gaps, with particular challenges in upscaling local measurements across large areas.  These gaps, and a corresponding lack of information on environmental controls of BNF among taxa and across scales, create significant uncertainty in ongoing assessments and in model projections of baseline patterns and human-alteration of biogeochemical cycles on Earth.

This Powell Center project will: (1) synthesize rates of BNF for organisms in the major ecological niches (trees, shrubs, herbs, lichens, cyanobacteria, mosses, liverworts, and free-living heterotrophic bacteria) across all terrestrial biomes globally, including agricultural systems; (2) use novel approaches to upscale symbiotic BNF from plants and lichens, to produce spatially-resolved maps for the U.S. and North America; and (3) develop prognostic tools for evaluating environmental controls of BNF in different ecological niches across terrestrial biomes for mapping, management, and modeling. This information will serve as a benchmark for understanding patterns and controls of terrestrial BNF, and will greatly improve our ability to model this critical process in response to regional and global environmental change.



ScienceBase Url: https://www.sciencebase.gov/catalog/item/5b1701f8e4b092d9651fcc7f

Powered by ScienceBase

Accessibility FOIA Privacy Policies and Notices

USA.gov logo U.S. Department of the Interior | U.S. Geological Survey | DOI Inspector General
URL: http://powellcenter.usgs.gov/view-project/5b1701f8e4b092d9651fcc7f
Page Contact Information: Ask USGS
Page Last Modified: December 19, 2013
Site Team