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[B-1.3.1 Clarification of Carbon Cycling and Budgets in the Cropland Ecosystems]

[Contact Person]

Hiroaki lkeda
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]

9,277,000 Yen (FY1995; 3,337,000 Yen)

[Abstract]

To clarify the long-term changes of carbon budgets in croplands, we made a sweet potato (Ipomoea batatas) - chinese cabbage (Brasica rapa) double-cropping field and an abandoned field in the National Institute of Agro-Environmental Sciences and measured their carbon cycle. The carbon budgets (mean±SD) of the double-cropping field and the abandoned field were -236±167 gC m^-2 yr^-1 and -305±97 gC m^-2 yr^-1, respectively. They showed marked year-to-year changes, acting as a source of carbon dioxide. It is suggested that the carbon budgets in croplands is markedly influenced by the human management such as a stubble manipulation and that the absorption of carbon dioxide into the abandoned fields increases year by year.

[Key Words]

Abandoned field, Carbon budget, Carbon cycle, Double-cropping field