Diffusion of oxygen and carbon dioxide through soil with temperature and water content effects on sink/source strength Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/pc289n28x

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  • Gaseous diffusion equations which describe the diffusion of oxygen and carbon dioxide through soil have been studied by several investigators. However, these efforts seldom considered gaseous diffusion through soil together with the effects of soil environmental factors such as soil temperature and soil water content on sink or source strength. Three gaseous diffusion equations have been formulated and solved. The problems considered are: (1) diffusion through a soil profile for conditions where the sink strength varies with temperature and is constant with time; (2) diffusion through a soil profile for conditions where the source strength varies with water content and temperature but is constant with time; (3) diffusion through a soil profile for conditions where the sink strength varies with time. The choices of mathematical representations of sink or source terms in the three equations are based on experiments reported in the literature by several authors. These sink or source models provide approximations of the relationships between the respiration activities of plant roots or soil microorganisms and the soil conditions such as temperature and water content. The new formulation for the effects of the soil temperature and soil water content on the diffusion coefficient was developed. Finite difference methods (Crank-Nicolson method) were used to solve the diffusion equations. Solutions obtained by solving the diffusion equations for three different environmental settings illustrate that soil temperature and water content have a strong effect on gaseous diffusion through the soil by controlling the sink or source strength. Results point to the need for better knowledge of the response of biological organisms in the soil to changing environmental conditions.
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