Effects of soil aggregate size, moisture content and fertilizer management on nitrous oxide production in a volcanic ash soil(Environment)
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概要
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A laboratory incubation study was conducted to determine the effects of soil aggregate size, soil moisture content and manure application on nitrous oxide (N_2O) production through nitrification and denitrification. In Southern Hokkaido, soil samples were taken from a mineral soil layer (2.5-10cm) of a grassland to which chemical fertilizer and manure had been applied. The soil aggregates were air-dried and sieved with 4.5mm and 2mm sieves, and the soil moisture was adjusted to 60% and 80% of field water capacity (FWC). Immediately after moistening, incubation was initiated and lasted for 9 days at 20℃. Following the start of incubation, a flush of N_2O, carbon dioxide (CO_2) and nitric oxide (NO) was observed. Production of all gases was higher in larger aggregates from the manure-applied soil. Productions of CO_2 and NO were not significantly influenced by soil moisture content, but N_2O production was considerably higher in 80% FWC as compared with 60% FWC. Based on the results of the N_2O-nitrogen (N)/NO-N ratio, the process of N_2O production was mainly due to nitrification in 60% FWC and denitrification in 80% FWC. Soil chemical properties, especially ammonium-N (NH^+_4-N), nitrate-N (NO_3-N) and water extractable organic C (WEOC) and microbial biomass C (MBC) also changed immediately after moistening. These changes were higher in larger aggregates from the manure-applied soil. Potential denitrification enzyme activity (DEA) was significantly higher in larger aggregates from manure-applied soil with higher moisture content. The N_2O production in both 60% and 80% FWC correlated significantly with MBC and DEA. Regardless of soil moisture conditions, MBC correlated significantly with DEA, WEOC consumption and apparent N mineralization. These facts suggest that larger soil aggregates could have quickly developed suitable internal conditions for microbial activity inside the aggregates and consequently stimulated N_2O production through nitrification and denitrification.
著者
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Shimizu Mariko
北大院農
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Hatano Ryusuke
北大院農
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DIBA Farzana
北大院農
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Shimizu Mariko
Soil Science Laboratory Graduate School Of Agriculture Hokkaido University
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Hatano Ryusuke
Soil Science Laboratory Graduate School Of Agriculture Hokkaido University
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Hatano Ryusuke
北大 大学院
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DIBA Farzana
Soil Science Laboratory, Graduate School of Agriculture, Hokkaido University
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Diba Farzana
Soil Science Laboratory Graduate School Of Agriculture Hokkaido University
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