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- W2146681316 abstract "Measurements of rhizosphere carbon efflux are critical to the determination of soil carbon balance by CO 2 flux measurements. We attempted to measure rhizosphere respiration in a forest ecosystem by transplanting 13 C-enriched soils from a tallgrass prairie into a mixed-conifer forest soil but found that atmospheric air mixing and lateral diffusion confounded delta 13 C-CO 2 measurements. Surface CO 2 efflux (delta 13 C [Formula: see text] 20) was enriched 6 relative to soil CO 2 measured at depth because of the presence of atmospheric-derived CO 2 (8) near the soil surface. The delta 13 C-CO 2 value of transplanted soil CO 2 did not reflect its 13 C-enriched carbon source but was within 1 of native soil CO 2 because of lateral diffusion from the surrounding native soil. A two-component steady-state model of lateral diffusion supported our assertion that this soil was susceptible to atmospheric air mixing and lateral diffusion because of its high effective porosity and relatively low concentration of soil CO 2 . Percent rhizosphere respiration was estimated at 35 and 45% after applying corrections for atmospheric air mixing and (or) lateral diffusion. These confounding effects may be reduced or eliminated by utilizing a larger transplanted soil pit and by reducing soil CO 2 diffusivity, for example, by increasing water content." @default.
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- W2146681316 date "2002-06-01" @default.
- W2146681316 modified "2023-09-29" @default.
- W2146681316 title "Lateral diffusion and atmospheric CO<sub>2</sub> mixing compromise estimates of rhizosphere respiration in a forest soil" @default.
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- W2146681316 doi "https://doi.org/10.1139/x02-028" @default.
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