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 (602KB)
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2,000,000 Yen
Eleven varieties of rice plants were water-cultivated at greenhouse condition for testing the transportation potentials of methane and nitrous oxide. The growth of rice was followed during the whole vegetation season. The transportation rate was found to be controlled both by methane concentration in the solution and by plant conductance. Measurements on conductance of rice plants indicated that, for methane, the conductance ranged from 0.3¡Þ0.2 (LM) to 1.21¡Þ0.7 (YB) umol/min/mM/plant at the tillering stage and varied between 0.6¡Þ0.3 (N36) and 2.5¡ÞO.7 (LM) umol/min/mM/plant at the reproduction stage. For nitrous oxide, the conductance varied from 0.029 umol/min/nM/plant (LM) to 0.079 umol/min/mM/plant (N3).
Plant conductance was significantly correlated with the plant physical size. Multiple linear regression indicated that the conducting resistance of the plant mainly comes from the roots. In most case, the maturation status of the root greatly affects the transportation potentials of the plant. Results also showed the conductance of methane was, in general, higher than that of nitrous oxide.
Conductance, Cultivar, Global warming, Greenhouse gas, Gas transport