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

Vicca, Sara, Janssens, Ivan A., Wong, Suan-Chin, Cernusak, Lucas A., and Farquhar, Graham D. (2010) Zea mays rhizosphere respiration, but not soil organic matter decomposition was stable across a temperature gradient. Soil Biology and Biochemistry, 42 (11). pp. 2030-2033.

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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 δ13C 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.

Item ID: 30288
Item Type: Article (Research - C1)
ISSN: 1879-3428
Keywords: soil CO(2) efflux, rhizosphere respiration, soil organic matter decomposition, stable carbon isotopes, temperature gradient, thermal acclimation
Funders: Promotion of Innovation through Science and Technology in Flanders, Fund for Scientific Research-Flanders
Date Deposited: 20 Nov 2013 09:33
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0503 Soil Sciences > 050303 Soil Biology @ 40%
06 BIOLOGICAL SCIENCES > 0607 Plant Biology > 060705 Plant Physiology @ 60%
SEO Codes: 96 ENVIRONMENT > 9614 Soils > 961402 Farmland, Arable Cropland and Permanent Cropland Soils @ 100%
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