Estimation of annual nitrogen mineralization amounts in the topsoil from kinetics analysis using the leaching incubation method

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  • Hirai Keizo
    Shikoku Res. Ctr., For. and Forest Prod. Res. Inst.:(Present office)Dep. of Forest Site Environment, For. and Forest Prod. Res. Inst.

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  • 洗滌培養法を用いた反応速度論的解析による表層土壌の現地窒素無機化量の推定
  • センデキ バイヨウホウ オ モチイタ ハンノウ ソクドロンテキ カイセキ ニ ヨル ヒョウソウ ドジョウ ノ ゲンチ チッソ ムキカリョウ ノ スイテイ

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We investigated the characteristics of nitrogen mineralization in the topsoil at different topographic positions and the effects of clear cutting in a Castanopsis cuspidate secondary forest by subjecting undisturbed soil samples to kinetic analysis using the leaching incubation method. We also estimated annual amounts of nitrogen mineralization in the soil at each site from parameters of kinetic analysis and recorded soil temperatures of these soils. We also compared leaching method using the undisturbed soil and bottle incubation method using the disturbed soil to evaluate the effect of soil disturbance on the characteristics of nitrogen mineralization. As a result, easily decomposable nitrogen (N_0) was found to be highest in the soil at the soil at the site of upper slope position, but the rate constant of mineralization (k) and apparent activation energy (Ea) were highest in the soil at the ridge site. Estimated amounts of nitrogen mineralization were ranged from 13.5 to 38.5kg ha^<-1>yr^<-1> 5cm^<-1> at the sites with the highest amounts observed at the ridge site. In the soil at the site of a clear cutting where in ridge site, as rate constant of mineralization decreased and apparent activation energy was increased compared at the ridge site in the forest where was not cut. Then, turnover rate which indicates ratio of annual mineralization amounts (N) to mineralizable pool (N_0) was lowest among sites. But nitrification was increasing at the site of a clear cutting. Values of nitrogen mineralization were three times higher with the bottle incubation method than with the leaching method. Mineralization rates of the leaching method at about 1.0-3.1%, were also 2.5-3 times higher than those of the bottle method which were about 1.0-3.1%.

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