Japan Geoscience Union Meeting 2014

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Oral

Symbol A (Atmospheric, Ocean, and Environmental Sciences) » A-HW Hydrology & Water Environment

[A-HW29_2PM1] JapanFlux: Role of terrestrial ecosystems in water/material cycles

Fri. May 2, 2014 2:15 PM - 4:00 PM 314 (3F)

Convener:*Takashi Hirano(Research Faculty of Agriculture, Hokkaido University), Katsumi Yamanoi(Forestry and Forest Products Research Institute), Kazuhito Ichii(Faculty of Symbiotic Systems Science, Fukushima University), Nobuko Saigusa(National Institute for Environmental Studies), Chair:Kazuhito Ichii(Japan Agency for Marine-Earth Science and Technology)

3:30 PM - 3:45 PM

[AHW29-06] Carbon emission by open burning from a paddy field and decomposition of the residual biomass in the paddy soil

Kazuya OKADA1, Keisuke ONO2, *Toru IWATA1 (1.Graduate school of Environmental and Life Sciense, Okayama University, 2.National Institute for Agro-Environmental Sciences)

Keywords:Organic Carbon, Rice Paddy, Soil, Decomposition, Carbon Dioxide

Twice sampling surveys of residual biomass above ground surface were conducted before and after the open burning, and carbon contents compared for the estimation of carbon emission by the burning. It is suggested that about 43% of carbon contents of above-ground rice plant was yield out as grain by the harvest, and about 30% of carbon emitted as CO2 by burning. Coarse Organice Matter (COM) in the paddy soil of a single-crop rice field was sampled on a regular schedule for three years. The carbon emission from the COM decomposition of residual biomass was estimated by analyzing of the variations in carbon content of COM. Decrease in COM was accelerated at the warming season between April and June, but it was resisted during rice cultivated season. It is estimated that 70% of COM was decomposed after a year.