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Rhizodeposition stimulated by elevated CO2 in a semiarid grassland

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Pendall, Elise, Mosier, Arvin R, and Morgan, Jack A, Rhizodeposition stimulated by elevated CO2 in a semiarid grassland: .

Summary

? Rhizodeposition, or the addition of C from roots to soil C pools, is expected to increase if net primary production is stimulated and some excess C is allocated below-ground. We investigated the effects of 5 yrs of elevated CO2 on below-ground C dynamics in a native, C3?C4 grassland ecosystem in Colorado, USA. ? Cylinder harvests following each growing season and monolith excavation at the end of the experiment provided data on root biomass, root C : N ratios, and root and soil ?13C values. We applied an isotopic mixing model to quantify new soil C inputs on elevated and ambient CO2 treatments. ? Root biomass increased by 23% and root C : N ratios increased by 26% after 5 yrs of elevated CO2. Species-specific differences were found [...]

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From Source - Mendeley RIS Export <br> On - Wed Sep 19 07:58:02 MDT 2012

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Title Citation Rhizodeposition stimulated by elevated CO2 in a semiarid grassland

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