• 作者： 洪崑煌
• 作者服務機構： 國立臺灣大學農業化學系
• 中文摘要： ?表示定常狀態下水田土壤X公分深處之氧濃度與氧在水中之擴散係數、滲濾速度，與微生物消耗氧速度間之關係， 導出微分方程式並求其解。其中微生物消耗氧之速度，分別假設適合一次反應及零次反應之場合而解之。所得氧濃度之深 度分佈函數有異，但所得氧化層厚度與滲濾水滲濾速度及微生物消耗氧速度之關係?甚相似。 正常稻田在最適於水稻生育之滲濾速度，?天下降2?3公分下，其氧化層之厚度?1公分附近或以下，本文中導出 公式所得結果亦同。當氧消耗速度大時，需要對水稻生育而言過高之接濾速度始可維持較厚的氧化層。滲濾水除去有毒嫌 氣呼吸代謝物之功用似較將氧帶入土中?重要。
• 英文摘要： Differential equations are derived and their solutions are obtained to show the relation between the steady state oxygen concentration at a depth X cm from the soil surface and the diffusion coefficient of oxygen through water, the percolation rate of soil water, and the microbial oxygen consumption rate. Both the cases in which the oxygen consumption follows first-order and zero-order kinetics are considered. Although both considerations give a different mathematical formulation of the oxygen concentration depth functions, the depth of the oxidizing zone and the percolation rate show quite the same relationship regardless of the order of reaction kinetics. In paddy soils with a suggested optimum percolation rate of 2-3 cm day-1 , the thickness of the oxidizing zone may be 1 cm or less, a result which is predicted from the equation derived. An undesirably high percolation rate may be needed to increase the thickness of the oxidizing zone if the oxygen consumption rate is high. It seems that the percolation water plays a more important role in removing the toxic anaerobic metabolites than it does in carrying oxygen into the soil.
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