National-scale estimation of methane emission from paddy fields in Japan : Database construction and upscaling using a process-based biogeochemistry model(Environment)

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概要

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• We have estimated methane (CH_4) emission from total rice (Oryza sativa L.) paddies in Japan by means of a process-based biogeochemistry model, DeNitrification-DeComposition(DNDC)-Rice, combined with a geographic information system (GIS) database of climate, soil and farming practices. In the GIS database, 2 million ha of rice paddies were divided into 17,408 units according to 136 climate areas, 16 soil types, four classes of drainage rate and two classes of groundwater level, to simulate CH_4 flux from each of the units applying the DNDC-Rice model. As a result, the national-scale CH_4 emission in 1990 was estimated to be 216 Gg carbon (C), 13% lower than a previous inventory estimated by the Tier 2 method. By our Tier 3 approach, a relatively higher CH_4 flux was estimated from eastern regions than from western regions of Japan, presumably due to the differences in climate and water management. Sensitivity analysis and uncertainty assessment indicated that it is important to account for the heterogeneity in soil properties such as field water capacity, iron (Fe) concentration and drainage rate, in order to reduce the uncertainty in regional estimates.

• 一般社団法人日本土壌肥料学会の論文

著者

• Shirato Yasuhito

  National Inst. Agro‐environmental Sci. Tsukuba Jpn

• HAYANO Michiko

  National Institute for Agro-Environmental Sciences

• Yagi Kazuyuki

  National Inst. For Agro‐environmental Sci. Ibaraki Jpn

• FUMOTO Tamon

  National Institute for Agro-Environmental Sciences

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