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Dynamics of Dissolved Organic Carbon and Methane Emissions in a Flooded Rice Soil

^a Laboratory of Soil Biology and Chemistry, Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, Nagoya, 464-8601 Japan
^b Fraunhofer Institute for Atmospheric Environmental Research, Garmisch-Partenkirchen, Germany
^c UFZ-Center for Environmental Research, Department of Soil Sciences, Theodor-Lieser Strasse 4, D-06120 Halle, Germany
^d College of Resources and Environmental Sciences, Zhejiang University, Zhejiang, China

View larger version (23K): [in a new window]   Fig. 1 Potted plant showing the setup for sampling soil solution in root zone and non-root zone partitioned by a nylon mesh bag

View larger version (12K): [in a new window]   Fig. 2 Dissolved organic C (DOC) concentrations in root and non-root zone of flooded soil planted with three rice cultivars. Asterisks indicate significant difference between root zone and non-root zone by t test at P < 0.05

View larger version (11K): [in a new window]   Fig. 3 Dissolved CH4 concentrations in root and non-root zone of flooded soil planted with three rice cultivars. Asterisks indicate significant differences between root zone and non-root zone by t test at P < 0.05

View larger version (20K): [in a new window]   Fig. 4 Methane emission rates from flooded soil planted with three rice cultivars. Bars represent standard errors. For clarity, only positive bar values are shown

View larger version (32K): [in a new window]   Fig. 5 Root exudation rates of three cultivars at panicle initiation stage (9 wk after seeding) grown in solution culture. Bar values followed by the same letter are not significantly different

View larger version (21K): [in a new window]   Fig. 6 Methane production rates of a flooded rice soil with amendment of root exudates. Root exudates were collected from Dular, IR72 and IR65598 at panicle initiation (9 wk after seeding). Bars represent standard error. Arrow denotes the addition time of root exudates to the anaerobic incubation