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Oxygen Transport to Plant Roots

Modeling for Physical Understanding of Soil Aeration

^a CSIRO, Land and Water, 120 Meiers Road, Indooroopilly QLD 4068, Australia and CRC for Sustainable Sugar Production
^b CSIRO, Land and Water, P.O. Box 1666, Canberra ACT 2601, Australia

View larger version (17K): [in a new window]   Fig. 1. Schematic diagram of a root surrounded by an actual and hypothetical liquid-filled boundary layer, the radii a and R is also shown.

View larger version (15K): [in a new window]   Fig. 2. Concentration of O2 in soil air (C) as related to depth in the soil, for different temperatures for a soil with = 0.13 m3 m-3. The other variables are as listed in Tables 1 and 2 and shown in Fig. 3.

View larger version (16K): [in a new window]   Fig. 3. Microbial (Mo) and root (Pz (z = 0) respiration terms as a function of temperature.

View larger version (17K): [in a new window]   Fig. 4. Sensitivity of m to C* for four different temperatures.

View larger version (15K): [in a new window]   Fig. 5. Sensitivity of m to Cr for four different temperatures.

View larger version (15K): [in a new window]   Fig. 6. Sensitivity of m to (a) Mo, (b) Lo and (c) Zm = Zr for four different temperatures.

View larger version (10K): [in a new window]   Fig. 7. Sensitivity of m to qo (the total respiration at z = 0) at a temperature of 293 K.

View larger version (15K): [in a new window]   Fig. 8. Sensitivity of m to R/a for four different temperatures.

View larger version (18K): [in a new window]   Fig. 9. Sensitivity of m to f for four different temperatures.

View larger version (17K): [in a new window]   Fig. 10. The time to deplete the oxygen dissolved in the water phase, as related to the water content of the soil (f- a) at four different temperatures. This analysis assumes no replenishment of the oxygen in the water phase during this depletion and that the root respiration was calculated with C = 0.05 kg m-3.