Analysis of δ13C of CO2 distinguishes between microbial respiration of added C4-sucrose and other soil respiration in a C3-ecosystem

By A. Ekblad, P. Högberg. Plant and Soil, 2000

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Keeling plots are non‐linear in non‐steady state diffusive environments (2009, background): “Deficiencies in this important but simplistic model include: 1) Assumption of an unrealistic constant concentration bottom boundary condition that could potentially create considerably higher source fractionation [ Davidson, 1995 ] than the expected � 4.4%fractionationcommonlyobservedinrealsoilsyste”
Carbon isotope fractionation during dark respiration and photorespiration in C3 plants (2004, background): “Fractionation due to microbial respiration was initially believed to be significant (Blair et al., 1985), although recent studies have estimated rhizosphere respiratory fractionation at less than 1 (Ekblad and Hogberg, 2000; Ekblad et al., 2002).”
Partitioning the components of soil respiration: a research challenge (2006, background): “The contribution of heterotrophic respiration is assumed to increase after addition of glucose to soil, but the autotrophic respiration assumed to remain unaltered (Ekblad and Högberg 2000).”