Nitrogen Mineralization in Tropical Wetland Rice Soils : II. Application of Exponential Models

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概要

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• Soil N mineralization during flooded incubation at 25 and 30℃ in 30 tropical wetland rice soils from the Philippines, Indonesia, Malaysia, and Thailand, reported earlier, were analyzed by applying first-order kinetic (exponential) equations. The amount of net mineralized N (N) was measured every 2 weeks until 16 weeks (t=d). Linear, N = At, single term equation, N=N_1[1-exp(-k_1t)], or two-term exponential equation, N=N_1[1-exp(-k_1t)]+N_2[1-exp(-k_2t)] was applied separately at both temperature levels. In 17 cases (11 at 25℃, 6 at 30℃) the linear equation gave the best fit, in 19 cases (7 at 25℃, 12 at 30℃) the single term equation gave the best fit, and in 24 cases (12 at 25℃, 12 at 30℃) the two-term equation gave the best fit. When the two-term equation gave the best fit, the second term indicated negative mineralization potentials except for 3 cases, showing net initial N immobilization. When the curves were almost linear, highly negative correlation was found between N_1 and k_1. The slowdown in N mineralization rate in the latter period of incubation was observed in one third of cases at 25℃, and in two thirds of cases at 30℃. Alternatively, exponential equations were applied for mineralization potentials independently of temperature. In 17 cases, single term equation gave the best fit, and in 13 cases, the two-term exponential equation gave the best fit. The second term expressed net initial immobilization fraction except for one soil. Single term equation gave a better fit when the soil clay content was less than 30% and sand content more than 20%, and the kinetic constants were negatively correlated with the clay content. Average ratio of k_1 at 30℃ to that at 25℃ was 1.7 in the single term equation, and 1.4 in the two-term equation. Comparison of these data with the reported data from Japanese soils was presented.

• 社団法人日本土壌肥料学会の論文

著者

• Watanabe Iwao

  Faculty of Bioresources, Mie University

• Watanabe I

  Faculty Of Bioresources Mie University

• Mascarina Grace

  International Rice Research Institute

• Manguiat I

  Department Of Soil Science College Of Agriculture University Of The Philippines At Los Banos

• Manguiat Ireneo

  Department of Soil Science, College of Agriculture, University of the Philippines at Los Banos

• Watanabe Iwao

  Faculty Of Agriculture The University Of Tokyo

• Watanabe Iwao

  Faculty Of Agriculture Iwate University

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