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Studies on the human forms of forest soils part 6 mineralization of nitrogen in brown forest soils



Studies on the human forms of forest soils part 6 mineralization of nitrogen in brown forest soils



Soil Science and Plant Nutrition 24(1): 41-54



The non-dried samples from each layer and horizon of the 29 brown forest soils which were analyzed previously for elementary composition were examind for N mineralization by the determination of inorganic N before and after 20 wk incubation. The higher the NT (total N) level of the sample was, the greater was the amount of NI (total inorganic N) contained in it. In general, both the NI level and the N [microbial and biochemical] mineralization rates (NI/NT .times. 100) showed a tendency to increase with movement downward from the L layer to the F-H layer, and thereafter decreased with increasing depth. The NI contained in the L-H-A layers was between 4.7-331 mg with 1 exception (924 mg), and most of it existed as NH4-N in the majority of the samples except that remarkably large amounts of NO3-N were found in the F-H-A layers of some wet type soils which had Cryptomeria japonica or broad-leaf tree vegetation. The A-A-B horizons of the wet type soils were distinguished from those of the dry type soils by their higher NI levels and higher values of the NO3-N/NI ratio. The rate of NO3-N to NI (NO3-N/NI .times. 100) was found to be generally higher in the A-A-B horizons than in the L-H-A layers with some exceptions.

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