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Fig. 14.11 Typical patterns of the changes in soil Eh causing higher CH4 emission. (a) Narrow range keeps the semi-reductive conditions, (b) Wide range has the long-term reductive conditions. Dotted line is the Eh limit

Figure 14.11 shows typical changing patterns of soil Eh that cause a large amount of CH4 emission. The Narrowest range (-100, +100mV) had frequent routines, and did not dry the soil enough (Fig. 14.11a). The soil with the continuous semi-reductive conditions is ready to produce CH4. Once the flooded period is kept longer, then CH4 emission occurs. On the other hand, the widest range (-150, +300 mV) took a long time to lower soil Eh to — 150mV, and thus kept the reductive conditions, causing CH4 emission (Fig. 14.11b). Therefore, under the conditions of this experiment, the combination of —100 and +300 mV (the Highest range) would be the best range that dries the soil enough and also has several times of short-term flooding. It will be possible to determine the ideal Eh range according to the soil type and other management practices.

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Renewable Energy Eco Friendly

Renewable Energy Eco Friendly

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable.

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