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Soil Moisture between Rice-Growing Seasons Affects Methane Emission, Production, and Oxidation

^a Lab. of Material Cycling in Pedosphere, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
^b National Institute of Agro-Environmental Sciences, 3-1-1, Kannondai, Tsukuba 305, Japan

View larger version (38K): [in a new window]   Fig. 1. Temporal variations of CH4 fluxes during the rice-growing period. (a) Soil E (Epiaquepts); (b) Soil H (Hapludults); I, II, III, IV, and V represent air-dryness water condition, 25 to 35, 50 to 60, 75 to 85% of soil water-holding capacity and flooding, respectively, during non-rice growing season. Bars indicate ± one standard deviation for Treatments II, III, and V; results with other treatments showed a similar range of standard deviation.

View larger version (35K): [in a new window]   Fig. 2. Temporal variations of soil EH during rice-growing period. (a) Soil E (Epiaquepts); (b) Soil H (Hapludults); I, II, III, IV, and V represent air-dry water condition, 25 to 35, 50 to 60, 75 to 85% of soil water-holding capacity and flooding, respectively, during non-rice-growing season. Bars indicate ± one standard deviation for Treatments II and V; results with other treatments showed a similar range of standard deviation.

View larger version (16K): [in a new window]   Fig. 3. Temporal variations of soil temperatures at depths of 0, 5, and 10 cm during rice-growing period.

View larger version (13K): [in a new window]   Fig. 4. Relationship between mean CH4 fluxes during rice-growing season and soil organic C contents before rice transplantation. Data in this figure were calculated on water treatment basis. Soil H (Hapludults), • Soil E (Epiaquepts).

View larger version (26K): [in a new window]   Fig. 5. Temporal variations of CH4 production rates during a 115-d incubation. (a) Soil E (Epiaquepts); (b) Soil H (Hapludults); (c) Treatment V; I, II, III, IV, and V represent air-dry water condition, 25 to 35, 50 to 60, 75 to 85% of soil water-holding capacity and flooding, respectively, during non-rice-growing season. Bars indicate ± one standard deviation for Treatments II, III, IV and V; results of Treatment I showed a similar range of standard deviation as Treatment III.

View larger version (14K): [in a new window]   Fig. 6. Relationship between the mean CH4 fluxes during rice-growing season and production rates during 115-d incubation. Data in this figure were calculated on pot basis.

View larger version (37K): [in a new window]   Fig. 7. Time course of CH4 oxidation in paddy soils pretreated by varying water content and incubated under the same historic water condition. (a) Soil E (Epiaquepts); (b) Soil H (Hapludults); I, II, III, IV, and V represent air-dry water condition, 25 to 35, 50 to 60, 75 to 85% of soil water-holding capacity and flooding, respectively, during non-rice-growing season. Bars indicate ± one standard deviation.

View larger version (37K): [in a new window]   Fig. 8. Time course of CH4 oxidation in paddy soils pretreated by varying water content but incubated under an identical water condition (80% of soil water-holding capacity). (a) Soil E (Epiaquepts); (b) Soil H (Hapludults); I, II, III, IV and V represent air-dry water condition, 25 to 35, 50 to 60, 75 to 85% of soil water-holding capacity and flooding, respectively, during non-rice-growing season. Bars indicate ± one standard deviation.