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[B-1.4 Quantitative Analysis of Carbon Budgets in Temperate Regional Ecosystem]

[Contact Person]

Hiroaki Ikeda
Division of Changing Earth and Agro-Environment
National Institute of Agro-Environmental Sciences
Ministry of Agriculture, Forestry and Fisheries
Kannondai, Tsukuba, Ibaraki, 305 JAPAN
Phone +81-298-38-8171 Fax +81-298-38-8199
E-mail ikedah@niaes.affrc.go.jp

[Total Budget for FY1993-1995]

11,362,000 Yen (FY1995; 4,048,000 Yen)

[Abstract]

　To clarify the carbon cycle in terrestrial ecosystems on a regional scale, we estimated the carbon budgets in the basin of Koise River, Ibaraki Prefecture(30 km x 30 km) using Landsat TM data. We calculated carbon budgets in four major ecosystems of the study area using compartment models which were designed to accept remote sensed carbon stocks in plants and soils. The mean annual carbon budgets in croplands, paddy fields, broad-leaved forests and coniferous forests were -151, 2.8, -60 and 543 gC m^-2 yr^-1, respectively. Although the croplands and broad-leaved forests acted as a source of carbon dioxide(CO₂), the coniferous forests absorbed a larger amount of CO₂. Therefore, the study area as a whole was estimated to act as a sink of CO₂(40 kt C yr^-1).

[Key Words]

Carbon budget, Compartment model, Landsat TM data, Remote sensing