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Root biomass and soil δ 13 C in C 3 and C 4 grasslands along a precipitation gradient http://t.co/IX6T3qMiF5 (PlantEcol)
Root biomass and soil δ 13 C in C 3 and C 4 grasslands along a precipitation gradient http://t.co/IX6T3qMiF5 (PlantEcol)