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Assessing Gas Diffusion Coefficients in Growing Media from in situ Water Flow and Storage Measurements

^a Dep. des Sols et de génie agroalimentaire, Faculté des Sciences de l'Agriculture et de l'Alimentation, Pavillon Comtois, Univ. Laval, Sainte-Foy, Québec, Canada G1K 7P4
^b Lincoln Univ., Center of Excellence–GIS Laboratory, 820 Chestnut Street, Room 307 Founders Hall, Jefferson City, MO, USA 65102-0029

View larger version (18K): [in a new window]   Fig. 1. Water desorption curves of the different substrates. The curve represents the fitted model obtained for all substrates while the line represents the linear fit in the 0 to –0.8 kPa and its extrapolation between –0.8 to –2 kPa of water potential range.

View larger version (15K): [in a new window]   Fig. 2. Estimation of gas diffusivity by different authors for peat. The line represents the regression reported by King and Smith (1987) and predict gas diffusivity for the range of air contents generally encountered after completion of the drainage of 4- to 20-cm-high containers. The mean of the four different peat substrates of this study is also reported for comparison purposes.

View larger version (20K): [in a new window]   Fig. 3. Relationship between gas diffusivity estimates obtained by gas diffusion chamber measurements and those obtained by either the multiple-point method or the two-point method.

View larger version (23K): [in a new window]   Fig. 4. Relationship between the pore effectiveness coefficient () estimates obtained by gas diffusion chamber measurements and those obtained by either the multiple-point method or the two-point method.