Skip to Main Content
Carbon fluxes on North American rangelandsAuthor(s): Tony Svejcar; Raymond Angell; James A. Bradford; William Dugas; William Emmerich; Albert B. Frank; Tagir Gilmanov; Marshall Haferkamp; Douglas A. Johnson; Herman Mayeux; Pat Mielnick; Jack Morgan; Nicanor Z. Saliendra; Gerald E. Schuman; Phillip L. Sims; Kereith Snyder
Source: Rangeland Ecology & Management. 61: 465-474.
Publication Series: Miscellaneous Publication
Station: Northern Research Station
PDF: View PDF (1.41 MB)
DescriptionRangelands account for almost half of the earth's land surface and may play an important role in the global carbon (C) cycle. We studied net ecosystem exchange (NEE) of C on eight North American rangeland sites over a 6-yr period. Management practices and disturbance regimes can influence NEE; for consistency, we compared ungrazed and undisturbed rangelands including four Great Plains sites from Texas to North Dakota, two Southwestern hot desert sites in New Mexico and Arizona, and two Northwestern sagebrush steppe sites in Idaho and Oregon. We used the Bowen ratio-energy balance system for continuous measurements of energy, water vapor, and carbon dioxide (CO2) fluxes at each study site during the measurement period (1996 to 2001 for most sites). Data were processed and screened using standardized procedures, which facilitated across-location comparisons. Although almost any site could be either a sink or source for C depending on yearly weather patterns, five of the eight native rangelands typically were sinks for atmospheric CO2 during the study period. Both sagebrush steppe sites were sinks and three of four Great Plains grasslands were sinks, but the two Southwest hot desert sites were sources of C on an annual basis. Most rangelands were characterized by short periods of high C uptake (2 mo to 3 mo) and long periods of C balance or small respiratory losses of C. Weather patterns during the measurement period strongly influenced conclusions about NEE on any given rangeland site. Droughts tended to limit periods of high C uptake and thus cause even the most productive sites to become sources of C on an annual basis. Our results show that native rangelands are a potentially important terrestrial sink for atmospheric CO2, and maintaining the period of active C uptake will be critical if we are to manage rangelands for C sequestration.
- Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat.
- During the capture process some typographical errors may occur.
- Please contact Sharon Hobrla, firstname.lastname@example.org if you notice any errors which make this publication unusable.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationSvejcar, Tony; Angell, Raymond; Bradford, James A.; Dugas, William; Emmerich, William; Frank, Albert B.; Gilmanov, Tagir; Haferkamp, Marshall; Johnson, Douglas A.; Mayeux, Herman; Mielnick, Pat; Morgan, Jack; Saliendra, Nicanor Z.; Schuman, Gerald E.; Sims, Phillip L.; Snyder, Kereith 2008. Carbon fluxes on North American rangelands. Rangeland Ecology & Management. 61: 465-474.
Keywordscarbon flux, grasslands, sequestration, shrub steppe
- Differential responses of production and respiration to temperature and moisture drive the carbon balance across a climatic gradient in New Mexico
- Grass seedling demography and sagebrush steppe restoration
- Scaling-up of CO2 fluxes to assess carbon sequestration in rangelands of Central Asia
XML: View XML