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Prediction of Gross and Net Nitrogen Mineralization-Immobilization-Turnover from Respiration

^a Royal Veterinary and Agricultural Univ., Plant and Soil Sci. Lab., Thorvaldsensvej 40, 3. sal, 1871 Frederiksberg C, Denmark
^b Division of Precision Agriculture, Swedish University of Agricultural Sciences, P.O. Box 234, SE-532 23 Skara, Sweden
^c Department of Horticulture and Crop Science, Agricultural University of Norway, P.O. Box 5022, N-1432 Aas, Norway

View larger version (37K): [in a new window]   Fig. 1. (a) Gross N immobilization rate (GI) vs. respiration rate (R). (b) Gross N mineralization rate (GM) vs. respiration rate (R). (c) Net N mineralization rate (NMD) vs. respiration rate (R). (d) gross N mineralization rate vs. respiration rate (R) divided by the C to N ratio (Z) of the plant materials. The regressions are based on data from all three incubation periods. Error bars show standard error (n = 3).

View larger version (29K): [in a new window]   Fig. 2. Gross N mineralization rate (GM) vs. respiration rate (R) divided by the C/N ratio (Z) of various plant residue constituents. (a) C/N ratio of total plant residue. (b) C/N ratio of water solubles (WS). (c) C/N ratio of neutral detergent solubles (NDS) and C/N ratio of acid detergent solubles (ADS). The regressions are based on data from the incubation period Day 5 to 6. Error bars show standard error (n = 3).

View larger version (27K): [in a new window]   Fig. 3. Determined net N mineralization rate (NMD) vs. predicted net N mineralization rate (NMP). Predicted net N mineralization was dependent on (a) C/N ratio of total plant litter, (b) C/N ratio of water solubles (WS), C/N ratio of neutral detergent solubles (NDS), or C/N ratio of acid detergent solubles (ADS). The regressions are based on data from the incubation period Day 5 to 6. Error bars show standard error (n = 3).