Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): A.J. Burton; K.S. Pregitzer; R.W. Ruess; R.L. Hendrick; Mike F. Allen
    Date: 2002
    Source: Oecologia 131: 559-568
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (969 KB)


    Root respiration rates have been shown to be correlated with temperature and root N concentration in studies of individual forest types or species, but it is not known how universal these relationships are across forest species adapted to widely different climatic and edaphic conditions. In order to test for broad, cross-species relationships, we measured fine root respiration, as O2 consumption, over a range of temperatures on excised root samples from ten forested study sites across North America in 1997. Significant differences existed among study sites in root respiration rates, with patterns among sites in respiration rate at a given temperature corresponding to differences among sites in fine root N concentrations. Root respiration rates were highly correlated with root N concentrations at all measurement temperatures (r2>0.81, P<0.001, for 6, 18 and 24°C). Lower root respiration rates in gymnosperms than in angiosperms were largely explained by lower fine root N concentrations in gymnosperms, and root N concentrations and respiration rates (at a given temperature) tended to be lower at warm sites (New Mexico, Florida, and Georgia) than at cool sites with short growing seasons (Michigan and Alaska). Root respiration rates increased exponentially with temperature at all sites. The Q10 for root respiration ranged from 2.4 to 3.1, but there were no significant differences among the forest types. The average Q10s for gymnosperms (Q10=2.7) and angiosperms (Q10=2.6) were almost identical, as were the average Q10s for roots of ectomycorrhizal species (Q10=2.7) and arbuscular mycorrhizal species (Q10=2.6). In 1998, fine root respiration at the study sites was measured in the field as C02 production at ambient soil temperature. Respiration rates under field conditions were dependent on both ambient soil temperature and root N concentration. Relationships between respiration (adjusted for temperature) and root N concentration for the field measurements were similar to those observed in the 1997 laboratory experiments. For root respiration in tree species, it appears that basic relationships with temperature and nitrogen exist across species and biomes.

    Publication Notes

    • You may send email to to request a hard copy of this publication.
    • (Please specify exactly which publication you are requesting and your mailing address.)
    • 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.


    Burton, A.J.; Pregitzer, K.S.; Ruess, R.W.; Hendrick, R.L.; Allen, Mike F. 2002. Root respiration in North American forests: Effects of nitrogen concentration and temperature across biomes. Oecologia 131: 559-568


    Root respiration, nitrogen, temperature, Q10, cross-biome effects

    Related Search

    XML: View XML
Show More
Show Fewer
Jump to Top of Page