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Mechanisms of the Priming Effect in a Savannah Soil Amended with Cellulose

^a Laboratoire d'Ecologie, UMR 7625, Ecole Normale Supérieure, 46 rue d'Ulm, F-75 230 Paris cedex 05, France
^b Laboratoire de Biogéochimie Isotopique, Université Pierre et Marie Curie, Case 120, 4 Place Jussieu, F-75 252 Paris cedex 05, France

View larger version (8K): [in a new window]   Fig. 1. Kinetic of extra release of glucose due to cellulase input to soil. (n = 3, mean ± se).

View larger version (15K): [in a new window]   Fig. 2. Cumulative mineralization of cellulose amended soil, of cellulose only, of soil C only and of control soil. (n = 3, mean ± se).

View larger version (33K): [in a new window]   Fig. 3. (a) Unlabeled microbial biomass and (b) labeled microbial biomass in soil incubated either alone or with 495 mg C-cellulose kg–1 soil. (n = 3, mean ± se). * indicates significant difference between the two nutrient treatments (P < 0.05).

View larger version (14K): [in a new window]   Fig. 4. Cumulative excess of mineralized soil 12C released as CO2. Excess of mineralized soil 12C was calculated using Excess = (12CO2 soil with cellulose) – (12CO2 control). (n = 3, mean ± se).