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    Author(s): Dale Johnson; Donn Geisinger; Roger Walker; John Newman; James VoseKatherine Elliott; Timothy Ball
    Date: 1994
    Source: Plant and Soil 165: 129 -138
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (784 KB)

    Description

    The purpose of this paper is to describe the effects of C02 and N treatments on soil pC02, calculated CO2 efflux, root biomass and soil carbon in open-top chambers planted with Pinus ponderosa seedlings. Based upon the literature, it was hypothesized that both elevated CO2 and N would cause increased root biomass which would in turn cause increases in both total soil CO2 efflux and microbial respiration. This hypothesis was only supported in part: both C02 and N treatments caused significant increases in root biomass, soil pCO2, and calculated CO2 efflux, but there were no differences in soil microbial respiration measured in the laboratory. Both correlative and quantitative comparisons of CO2 efflux rates indicated that microbial respiration contributes little to total soil CO2 efflux in the field. Measurements of soil pC02 and calculated CO2 efflux provided inexpensive, non-invasive, and relatively sensitive indices of belowground response to CO2 and N treatments.

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    Citation

    Johnson, Dale; Geisinger, Donn; Walker, Roger; Newman, John; Vose, James; Elliott, Katherine; Ball, Timothy. 1994. Soil pCO2, soil respiration, and root activity in CO2 - fumigated and nitrogen-fertilized ponderosa pine. Plant and Soil 165: 129 -138

    Keywords

    carbon dioxide, nitrogen, ponderosa pine, soil respiration, soil carbon

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