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[B-1.3.3 Quantitative Analysis of Carbon Cycle and Budget in Agroforest]

[Contact Person]

Naruo Matsumoto
Laboratory of Resources Dynamics
National Institute of Agro-Environmental Sciences
Ministry of Agriculture, Forestry and Fisheries
3-1-1 Kannondai, Tsukuba, Ibaraki 305, Japan
Tel:+81-298-38-8224 Fax:+81-298-38-8220
E-mail:matsunar@affrc.go.jp

[Total Budget for FY1993-FY1995]

11,650,000 Yen (FY1995; 4,397,000 Yen)

[Abstract]

　The object of the study is to clarify quantitatively carbon cycles in agroforest ecosystems which are disturbed artificially.
　The experimental plots are a managed agroforest which is cut undergrowth and raked litter, an abandoned agroforest which is dominated by draft bamboo in the forest floor, and a natural forest. The agroforests are 20 years old deciduous forest, and the natural forest is 50 years old deciduous forest. We measured plant biomass, litter fall, litter biomass, soil carbon stock, C0₂ emission, and environmental factors such as soil temperature. Carbon cycle of each forest was estimated from the measured data.
　The carbon storage of the managed agroforest, the abandoned agroforest, and the natural forest was estimated 43, 45 and 108 tC/ha in plants, and 80, 88 and 224 tC/ha in soil, respectively. The carbon sink in each plot was estimated 3.7, 3.5 and 2.2 tC/ha/yr in plants, and -0.8, 1.3 and 1.5 tC/ha/yr in soil, respectively.
　Carbon in soil of the managed agroforest did not accumulate. Raking litter and cutting undergrowth reduce carbon supply to soil, then reduce amount of carbon sink of forest. The carbon storage of the 50 years old forest was accumulating still. Estimation of global carbon cycle has to take account of area and age of secondary forest which had been disturbed artificially.

[Key Words]

Carbon cycle, Agroforest, Carbon sink, Cutting undergrowth, Raking litter