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Carbon Turnover Kinetics with Depth in a French Loamy Soil

^a Bioforsk, Norwegian Institute for Agricultural and Environmental Research, Soil and Environment Division, 1432 Ås, Norway
^b UMR Biogéochimie et Ecologie des Milieux Continentaux. (BioEMCo), INRA-CNRS-INAPG-ENS-ENSCP-Univ. Paris VI, Bâtiment EGER, 78850 Thiverval-Grignon France
^c Norwegian Univ. of Life Sciences, Dep. of Plant and Environmental Sciences, 1432 Ås, Norway

View larger version (26K): [in a new window]   Fig.1. Maize grain yields between 1993 and 2003. Yields were measured at the Closeaux sites except for 1996, 2001, and 2002 when data were only collected as a single-value average across the INRA-Versailles experimental station where the Closeaux plots are located.

View larger version (11K): [in a new window]   Fig. 2. Distribution of total C, total N, and C/N ratio with soil depth at the Closeaux experimental plots. Date represent 10-yr averages (n = 10, filled circles) with standard deviations, averages for 0 to 5 yr of maize (n = 5, empty squares), and 6 to 10 yr of maize (n = 5, empty triangles).

View larger version (14K): [in a new window]   Fig. 3. Distribution of the soil 13C signature () as a function of depth in the profile and the duration of maize cropping following wheat: (a) 0 to 15 cm, (b) 15 to 30 cm, (c) 30 to 45 cm, (d) 45 to 60 cm, (e) 60 to 75 cm, (f) 75 to 90 cm, and (g) 90 to 105 cm. All 224 data points represented.

View larger version (16K): [in a new window]   Fig. 4. Distribution of the resulting proportion of new maize soil organic carbon (SOC) (%) as a function of depth in the profile and the duration of maize cropping following wheat: (a) 0 to 15 cm, (b) 15 to 30 cm, (c) 30 to 45 cm, (d) 45 to 60 cm, (e) 60 to 75 cm, (f) 75 to 90 cm, and (g) 90 to 105 cm. All 224 data points represented. ***, significant at P 0.001; NS, not significant; S, slope.

View larger version (17K): [in a new window]   Fig. 5. Relationship between total C and oxalate-extractable Fe + Al content in the 15- to 30-cm, 30- to 45-cm and 45- to 60-cm soil layers at the Closeaux. Linear regression represented for all 42 samples (3 depths and n = 14 per depth).