航空レーザー測距法によるカナダ西部亜寒帯林の広域森林蓄積推定  [in Japanese] Long-range Estimation of Standing Timber Stock in Western Boreal Forest of Canada Using Airborne Laser Altimetry  [in Japanese]

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Abstract

カナダ西部の亜寒帯林を南北に縦断する600kmのトランセクトを対象に航空レーザー測距を実施して森林の縦断プロフィールを得たうえ, 航跡直下の47林分で林分蓄積を実測するとともに, アロメトリー理論に基づき縦断プロフィール面積の一次関数として蓄積を表す関係式を新たに構築した。この蓄積式の有効性を上記実測値で検証したところ, プロフィール面積に対する蓄積の回帰の決定係数は0.74ときわめて有意であった。実測林分の半数で決定したプロフィール面積に対する蓄積の回帰により推定した蓄積を残り半分の実測蓄積と交互に照合したところ, 推定値と実測値の食い違いが0.9~4.5%に収まり, 蓄積式の適用性につき満足すべき結果が得られた。最後に47林分すべてを用いて回帰式を決定し, トランセクト全長にわたる森林蓄積の分布を推定したところ, 蓄積は平均136m<sup>3</sup>/haで, 最大値はトランセクトの中央より南側に現れ, 北の亜寒帯林側へは徐々に, 南のプレーリー側へは急激に落ち込むという偏った形をしていることが明らかになった。

A continuous vegetation profile covering a 600 km transect set up N-S across the boreal forest region of western Canada was obtained by airborne laser altimetry, along with ground-truth measurements of standing timber stock and biomass in a total of 47 forest stands located directly under the laser profiling flight course. Subsequently using these data, a mathematical model proposed to relate the vegetation profile with timber stock on the basis of the allometry principle was tested, resulting in a highly significant coefficient of determination of 0.74 between the profile area and standing timber stock. A comparison between the actually measured timber stock of half the ground-truth stands and the estimated counterpart based on a regression determined from the remaining half, also revealed a discrepancy of as little as 0.9∼4.5% in total timber volume. Finally, based on the regression determined from all the 47 ground-truth measurements, the distribution of timber stock all along the 600 km transect was estimated, in which the maximum stocking appearing toward south declined sharply further south and more gradually north in a southerly skewed distribution with an overall mean timber stocking of 136 m<sup>3</sup>/ha.

Journal

  • Journal of the Japanese Forest Society

    Journal of the Japanese Forest Society 88(2), 103-113, 2006-04-01

    Japanese Forestry Society

References:  46

Cited by:  3

Codes

  • NII Article ID (NAID)
    110006882789
  • NII NACSIS-CAT ID (NCID)
    AA12003078
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    13498509
  • NDL Article ID
    7935922
  • NDL Source Classification
    ZR21(科学技術--農林水産--林産)
  • NDL Call No.
    Z18-340
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE 
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