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Methane flux from paddy vegetated soil: a comparison between biogas digested liquid and chemical fertilizer

机译：Methane flux from paddy vegetated soil: a comparison between biogas digested liquid and chemical fertilizer

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摘要

A microcosm-based study was conducted to evaluate the effects of application of biogas digested liquid or chemical fertilizer on CH4 flux, associated methanogenic archaeal community, soil chemical and microbial properties, and aboveground plant biomass in paddy soil. Our results showed that digested liquid application significantly decreased the seasonal and cumulative CH4 flux compared to chemical fertilizer treatment. The application of digested liquid treatment significantly decreased NH4 (+)-N and soluble total nitrogen content without affecting NO3 (-)-N and microbial biomass nitrogen. The soluble organic carbon and microbial biomass carbon contents were nearly similar for digested liquid and chemical fertilizer treatments. Paddy plant biomass (shoot weight, panicle numbers and weight of panicles) were found to be lower in the digested liquid treated containers but it did not affect the cumulative CH4 flux g(-1) yield. Denaturing Gradient Gel Electrophoresis gave similar banding patterns indicating no differences in the methanogenic archaeal diversity among the control, digested liquid and chemical fertilizer treated containers. Thus, the observed decrease in CH4 flux with the application of digested liquid is possibly due to the variation in the soil variables and aboveground plant biomass without affecting the methanogenic archaeal diversity.

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