森林立地学会誌 森林立地47(2),2005,95〜104

Jpn.J.For.Environment 47(2),  95-104  2005

 

Allometric equations and parameters for estimating the biomass of planted Pinus merkusii Jungh. et de Vr. forests

 

Kiyoshi Miyakuni*, N.M. Heriyanto**, Ika Heriansyah**,Rinaldi Imanuddin** and Yoshiyuki Kiyono***

*Registered expert for the Japan International Forestry Promotion Center (JIFPRO)

**Forest and Nature Concervation Research and development Center

***Department of Plant Ecology, Forest and Forest Products Research Institute

 

We inverstigated the possibility of formulating broadly applicable equations and parameters for estimating the biomass of planted Pinus merkusii Jungh. et de Vr. forests. We selected four plantations of different stand ages (5, 11, 19, and 24 years) in West Java, Indonesia, and destructively sampled 55 trees after tree census. (1) Coefficients of allometric equations for estimating biomass from tree census data : When the allometric equations contained height data [Yn=a(DBH2height)b], we did not detect significant differences between forests in the predictor variables in the equations. (2) Parameters for estimating biomass from stem volume data, i.e., basic density, biomass expansion factor, and root-to-shoot ratio : Some parameters obtained by this study differed from the trends in the default values in the Good Practice Guidance for Land Use, Land Use Change and Forestry, provided by the Intergovernmental Panel on Climate Change. Those default values should thus be refined to reduce errors. (3) Other parameters : Using tree census data collected at 20 sites in Indonesia by the Forest and Nature Conservation Research and Development Center, chrono-sequential changes in biomass were estimated using an allometric equation obtained in the present study. The estimated stand-level biomass of a 21-year-old stand ranged from 161.75 to 456.34 t ha-1 and, according to multiple-regression analysis, varied significantly with tree density and site index.

Key words: Clean Development Mechanism, afforestation, reforestation, GPG-LULUCF, basic density, biomass expansion factor, root-to-shoot ratio, site index, stand density, MAI

 

宮國 淳,N.M. Heriyanto Ika Heriansyah Rinaldi Imanuddin,清野嘉之:メルクシマツ林ののバイオマス推定のための相対成長式およびその他のパラメータ

 メルクシマツ植林地におけるバイオマス量推測を目的とする汎用性の高い係数・パラメータについて検討した。インドネシア・西ジャワ州で5111924年生の林分にプロットを設置,毎木調査の後55本を破壊調査した。(1)毎木調査データを利用したバイオマス量推定に用いられるアロメトリー式を算出した。樹高を考慮に入れた[Yn=a(DBH2height)b]の相対成長式の場合,各係数に林齢による有意差が見られなかった。(2)林木材積からのバイオマス量推定に用いられる材積密度,拡大係数,根―地上部比率を算出した。その結果,既存のIPCCLULUCF-GPGのデフォルト値と一部異なる結果が得られ,デフォルト値はさらなる検討が必要と思われた。(3)インドネシア国内20ヶ所のメルクシマツ植林地の毎木調査のモニタリングデータに本研究のアロメトリー式を適用し,林分バイオマスの時系列変化を推定した。21年生時の林分バイオマスは161.75456.34 t ha-1範囲内にあり,重回帰分析によれば立木密度や地位指数によって有意に変化した。

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