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Microbial biomass carbon and methane oxidation influenced by rice cultivars and elevated CO 2 in a Japanese paddy soil
Author(s) -
Inubushi K.,
Cheng W.,
Mizuno T.,
Lou Y.,
Hasegawa T.,
Sakai H.,
Kobayashi K.
Publication year - 2011
Publication title -
european journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 1351-0754
DOI - 10.1111/j.1365-2389.2010.01323.x
Subject(s) - methane , cultivar , biomass (ecology) , chemistry , agronomy , anaerobic oxidation of methane , microcosm , carbon fibers , environmental chemistry , biology , materials science , organic chemistry , composite number , composite material
Microbial biomass carbon (C) and methane oxidation activity influenced by rice cultivars and elevated atmospheric CO 2 were investigated in a microcosm experiment in two controlled‐environment chambers with CO 2 concentrations at 370 µl l −1 (ambient) and 570 µl l −1 (elevated). Four rice cultivars were grown in sandy paddy soil in this experiment; these were IR65598, IR72, Dular and Koshihikari. Soil microbial biomass C under elevated CO 2 was significantly larger (by 18.9–25.2%) than that under ambient CO 2 , and varied with the cultivars in the sequence IR72 > Dular > IR65598 > Koshihikari. Methane oxidation activity in the soil also differed among the cultivars, in the sequence IR72 > Dular > Koshihikari > IR65598, but was larger under elevated CO 2 than under ambient CO 2 only with IR72. Methane oxidation activity was positively correlated with microbial biomass C among four cultivars under two CO 2 conditions. This study indicated that microbial biomass C in paddy soil varied among the rice varieties examined, but was increased significantly by elevated CO 2 and correlated with methane oxidation, which may in turn influence methane emission to the atmosphere.