Zea mays rhizosphere respiration, but not soil organic matter decomposition was stable across a temperature gradient

Sara Vicca, Ivan Janssens, Suan-Chin Wong, Lucas Cernusak, G Farquhar

    Research output: Contribution to journalArticle

    Abstract

    In a greenhouse experiment, we grew maize plants at different densities. We added fertilizer to half of the pots and created a temperature gradient. After 10 weeks of plant growth, we measured soil CO2 efflux (SCE) and determined rhizosphere respiration (Rrhizo) and the decomposition rate of soil organic matter (RSOM) using the different ?13C of the C3 soil and C4 plants. Whereas Rrhizo remained stable across the temperature gradient, RSOM significantly increased with growth temperature. Neither plant density, nor the fertilizer treatment affected the relation between Rrhizo or RSOM and growth temperature. Although Rrhizo might still increase with temperature in the short term, long term exposure to higher temperatures revealed full thermal acclimation of Rrhizo, but not of RSOM. � 2010 Elsevier Ltd.
    Original languageEnglish
    Pages (from-to)2030-2033
    Number of pages4
    JournalSoil Biology and Biochemistry
    Volume42
    Publication statusPublished - 2010

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