Gas Exchange Analysis for Estimating Net CO_2 Fixation Capacity of Mangrove (Rhizophora stylosa) Forest in the Mouth of River Fukido, Ishigaki Island, Japan(Crop Physiology and Ecology)

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Mangrove trees have been considered to possess a higher carbon fixation capacity than terrestrial trees although a reliable method to estimate their CO_2 fixation capacity has not been established. In this study, net CO_2 fixation in above-ground of Rhizophora stylosa was estimated as the difference between photosynthetic absorption and respiratory emission of CO_2. In order to estimate these parameters, photosynthetic rates of single-leaves in response to light and temperature and the respiratory rates of leaves and branches in response to temperature were measured. Furthermore, we established a model of diurnal change in temperature. Monthly averages of the diurnal temperature change were used for correcting the CO_2 absorption and emission. The effect of temperature modification on the estimation of net CO_2 fixation was examined, and the net CO_2 fixation capacity estimated with and without temperature modification was compared. Biomass accumulation estimated without temperature modification (i.e. corrected only for the light intensity) was 6.1 tons ha^<-1> yr^<-1>, while that estimated with temperature modification (i.e. corrected for both light intensity and temperature) was 13.0 tons ha^<-1> yr^<-1>. A doubling of the estimated values of net CO_2 fixation as observed in this study was caused by the decrease in respiratory CO_2 emission by half, which results from temperature modification. These findings suggest that temperature modification in gas exchange analysis could improve the accuracy of estimation of the net CO_2 fixation capacity.
日本作物学会の論文

Gas Exchange Analysis for Estimating Net CO_2 Fixation Capacity of Mangrove (Rhizophora stylosa) Forest in the Mouth of River Fukido, Ishigaki Island, Japan(Crop Physiology and Ecology)

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