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): Siyan Ma; Jiquan Chen; John R. ButnorMalcolm North; Eugénie S. Euskirchen; Brian Oakley
    Date: 2005
    Source: Forest Science 51(3):221-232
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (918 KB)

    Description

    Little is known about biophysical controls on soil respiration in California's Sierra Nevada old-growth, mixed-conifer forests. Using portable and automated soil respiration sampling units, we measured soil respiration rate (SRR) in three dominant patch types: closed canopy (CC), ceanothus-dominated patches (CECO), and open canopy (OC). SRR varied significantly among the patch types, ranging from 2.0 to 4.5 μmol m-2 s-1 and from 0.9 to 2.9 μmol m-2 s-1 during the 1999 and 2000 measuring periods, respectively, with the maximum in CECO and the minimum in OC. Multiple peaks of seasonal SRR were functions of soil temperature and moisture dynamics. The relationship between SRR and soil temperature switched from a positive to a negative correlation when soil moisture dropped from saturation to drought. Time lag, as a function of soil moisture, was included in an exponential model to assess the effects of soil moisture on SRR in this seasonal water-stressed ecosystem. The total soil C flux summed by an area-weighted average across all three patch types was 660 ± 163 g C m-2 from May to Oct. 2000. These results may be applicable to other water-stressed forests in the Mediterranean climate Lone, and have implications for the conservation of soil carbon.

    Publication Notes

    • You may send email to pubrequest@fs.fed.us 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.

    Citation

    Ma, Siyan; Chen, Jiquan; Butnor, John R.; North, Malcolm; Euskirchen, Eugénie S.; Oakley, Brian. 2005. Biophysical controls on soil respiration in the dominant patch types of an old-growth, mixed-conifer forest. Forest Science 51(3):221-232

    Keywords

    Soil CO2, efflux, soil temperature, soil moisture, Sierra Nevada, California

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page
https://www.fs.usda.gov/treesearch/pubs/9756