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Hydraulic Properties of Soil–Straw Mixtures

^a INRA, rue Fernand Christ, 02000 Laon, France
^b Laboratory for Soil and Water Management, Katholieke Universiteit Leuven, Kasteelpark Arenberg 20, 3001 Heverlee, Belgium

View larger version (112K): [in a new window]   Fig. 1. Four tomographic sections of cylindrical samples with 0, 0.1, 0.2, and 0.3 cm3 cm–3 of straw content. This was visualized using microfocus computer X-ray tomography. The aggregates are white, the pores are black, and the straw is black with a gray wall.

View larger version (18K): [in a new window]   Fig. 2. Retention curves of soil and straw expressed as a function of gravimetric water content (a) and volumetric water content (b).

View larger version (22K): [in a new window]   Fig. 3. Retention curves of the soil–straw mixtures (straw content expressed in cm3 cm–3) expressed as a function of (a) gravimetric water content and (b) volumetric water content. Retention curves obtained with the suction table and pressure extractor methods are drawn with open symbols. Retention curves obtained with Wind's method are drawn with black symbols.

View larger version (28K): [in a new window]   Fig. 4. Comparison between measured and calculated retention curves for the different soil–straw mixtures (straw content expressed in cm3 cm–3). The model values are shown with the error bars.

View larger version (28K): [in a new window]   Fig. 5. Hydraulic conductivity curves for the soil–straw mixtures (straw content expressed in cm3 cm–3).

View larger version (21K): [in a new window]   Fig. 6. (a) Pressure heads and moisture function fw at the gravimetric water content of 0.24 g g–1. (b) Change through time of organic C decomposition for the different moisture functions fw.

View larger version (16K): [in a new window]   Fig. 7. Change through time of (a) the pressure head at 3.5 cm from the top and (b) CO2 emission with hydraulic conductivity curve of soil with 0.3 cm3 cm–3 of straw content (Simulation 1) and with hydraulic conductivity curve of soil without straw (Simulation 2).