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): S. Palmroth; Chris A. Maier; Heather R. McCarthy; A. C. Oishi; H. S. Kim; Kurt H. Johnsen; Gabrial G. Katul; Ram Oren
    Date: 2005
    Source: Global Change Biology 11: 421-434
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (1.53 MB)

    Description

    Forest floor C02 efflux (Fff) depends on vegetation type, climate, and soil physical properties. We assessed the effects of biological factors on Fff by comparing a maturing pine plantation (PP) and a nearby mature Oak-Hickory-type hardwood forest (HW). Fff was measured continuously with soil chambers connected to an IRGA during 2001-2002. At both sites, Fff depended on soil temperature at 5cm (T5) when soil was moist (soil moisture, 0> 0.20 m3mm-3)a, nd on both T5 and 0 when soil was drier. A model (Fff( T5,0 )) explained 292% of the variation in the daily mean Fff at both sites. Higher radiation reaching the ground during the leafless period, and a thinner litter layer because of faster decomposition, probably caused higher soil temperature at HW compared with PP. The annual Frt was estimated at 1330 and 1464 g Cm yr-l for a year with mild drought (2001) at PP and HW, respectively, and 1231 and 1557g Cm-2 yr-1 for a year with severe drought (2002). In the wetter year, higher soil temperature and moisture at HW compared with PP compensated for the negative effect on Fff of the response to these variables resulting in similar annual Fff at both stands. In the drier year, however, the response to soil temperature and moisture was more similar at the two stands causing the difference in the state variables to impel a higher Fff at HW. A simple mass balance indicated that in the wetter year, C in the litter-soil system was at steady state at HW, and was accruing at PP. However, HW was probably losing C from the mineral soil during the severe drought year of 2002, while PP was accumulating C at a lower rate because of a loss of C from the litter layer. Such contrasting behavior of two forest types in close proximity might frustrate attempts to estimate regional carbon (C) fluxes and net C exchange.

    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

    Palmroth, S.; Maier, Chris A.; McCarthy, Heather R.; Oishi, A. C.; Kim, H. S.; Johnsen, Kurt H.; Katul, Gabrial G.; Oren, Ram 2005. Contrasting responses to drought of forest floor CO2 efflux in a loblolly pine plantation and a nearby Oak-Hickory forest. Global Change Biology 11: 421-434

    Keywords

    belowground carbon allocation, chamber conifer, hardwood, IRGA, litterfall, Pinus taeda L., Quercus ssp., soil respiration, temperate

    Related Search


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