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Studies on the humus forms of forest soils part 7 nitrogen transformation during incubation



Studies on the humus forms of forest soils part 7 nitrogen transformation during incubation



Soil Science and Plant Nutrition 24(2): 253-264



The changes in inorganic N levels during 20 wk incubation were examined using both non-dried and air-dried samples from each layer and horizon of 9 out of 29 brown forest soils. Also, the effects of air-drying on the level of inorganic N were investigated. The N1 (inorganic N) increased most remarkably at an early period in both non-dried and air-dried samples, and later increased continuously with a lag phase in teh former, but none in the latter. In the majority of both non-dried and air-dried samples, the production patterns of NH4-N agreed with those of N1 because of the small quantity of NO3-N. However, in samples where much NO3-N was generated, an alternate rise and fall of NH4-N and NO3-N took place, although decrease in NO3-N content were observed only in non-dried samples. Air-drying caused increases of N1 in L layers and decreases in F-H-A layers, and the larger the amount of N1 in the non-dried sample, the greater is the extent or rise and fall in N1 resulting from air-drying. The N1 in A-A-B horizons changed slightly with air-drying. The DE(I) [drying effect for N1] initially increased up to a maximum between 3-5 wk, and thereafter, decreased down to minus values for F-H-A layers, or maintained plus values for A-A-B horizons. In air-dried sample, the incipient increase of DE(I) was due to the abrupt increase of NH4-N, while the nitrification was restrained during the same period. The nitrification in air-dried samples was observed to increase later in the incubation period, after the easily mineralizable N which was accelearted to generate by air-drying preparation was completey converted into NH4-N.

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