論文（Original Article）


Height Growth Relationships in Secondary Plant Communities in Kalimantan for Forestry Projects
under the Clean Development Mechanism of COP 7


KIYONO Yoshiyuki, HASTANIAH and MIYAKUNI Kiyoshi


Abstract
We classified the secondary vegetation of degraded ecosystems in the humid tropics of Indonesian Borneo (Kalimantan) into 5 plant communities and analyzed their overstory height growth. Each community had a different growth curve, although the status of the soils was considered to be less variable. Overstory height was similar among plant communities during the initial stages of their establishment, but 2 or 3 y later, communities of trees (including species of small trees up to about 10 m high) communities of trees (including species of small trees up to about 10 m high) were obviously taller than communities of communities of shrubs and short grasses. The mean annual increment in overstory height, which is considered to be an index of the increase in biomass, varied with community type and age. Forest establishment in areas where shrubs and short-grass communities have become established may greatly increase overall carbon-fixation rates by vegetation. For forestry projects under the clean development mechanism (CDM), sites where are shrub and short-grass communities are considered to be most suitable, provided that fire prevention is done properly, because shrubs and short grasses are burnedcatch fire easily.

Key words : baseline scenario, height growth, biomass, afforestation, reforestation, Kyoto Protocol, CDM



カリマンタンにおける二次植物群落の高さの成長：
植林によるCOP 7の吸収源CDM（クリーン開発メカニズム）事業の適地


清野 嘉之・ハスタニア・宮國 淳


要　旨
　インドネシア国カリマンタン島の湿潤熱帯地域で劣化生態系の二次植生を5つの植物群落に分類し、上層高の成長を解析した。土壌養分の状態に大きな違いはないが、成長曲線は群落によって異なった。上層高は群落の成立初期には群落間で大差ないが、2、3年後には、高木種（最大高10m程度の小高木を含む）の群落は低木や草本群落よりも明らかに背が高かった。上層高の年平均増加量は群落バイオマスの増加の指標と考えられる値で、群落のタイプや齢によって変化した。低木や草本群落に森林を造成すると、植生が固定する炭素量は大きく増加するであろう。低木や草本は類焼しやすいが、適切に防火できるのであれば、低木や草本群落の成立する土地が植林による吸収源CDM事業に最も適していると考えられる。

キーワード：ベースラインシナリオ、樹高成長、バイオマス、新規植林、再植林、京都議定書、CDM

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