西表島の亜熱帯常緑広葉樹林における皆伐火入れ18年後の林分構造と種多様性摘要 Stand structure and species diversity of 18-year-old post clearcut-burn regeneration of a subtropical evergreen broad-leaved forest on Iriomote Island, Okinawa

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Abstract

亜熱帯常緑広葉樹林の天然林伐採跡地における二次遷移の研究の一環をなすものである。本論文では熱帯,亜熱帯地域の焼畑を想定し,沖縄西表島で天然林を伐採,伐木を燃焼した跡地18 年後の林分構造と出現樹種の種の多様性について分析した。試験地の面積は0.87 ha で伐採前に燃焼区と対照区に区分し,10m×10m (100 m<SUP>2</SUP>)の方形プロットを4 個設定した。再生林について樹高1m 以上の立木を毎木調査した。基底面積と立木密度は,生活形別では差がみられたが,処理区間では明確な差がみられなかった。種の豊かさ度と多様度は,処理区間では明確な差がみられなかったが,日本の暖温帯林より高く,中国の熱帯林より低い傾向を示した。出現樹種は30 科,50 属,72 種で,ブナ科,アカネ科,トウダイグサ科が多く,イタジイ,ボチョウジ,エゴノキの優占度が高かった。根株の萌芽再生が旺盛で,萌芽力の強いイタジイの基底面積は54.9% を占めた。再生林分は萌芽再生を主体にして層化がすすみ,皆伐前の天然林構造に類似,遷移していくものと推察された。

Within the framework of a series of secondary succession of a subtropical evergreen broad-leaved forest, the present study was undertaken to clarify stand structure and species diversity of 18-year-old post clearcut-burn regeneration on Iriomote Island, Okinawa. Within a 0.87 ha clearcut study area, four 10 m×10 m plots were installed in the centre of each section, two burned after the clearcut while two left non-burned. After 18 years of sprouting recovery, the woody stems ≥1.0 m in height were surveyed. While the basal area, stem density, richness and Shannon-Wiener index differed significantly amongst phanerophyte types, they were not significantly different between burned and non-burned plots. The sprouting regeneration showed high species diversity for both burned and non-burned plots, higher than equivalent values for mainland of Japanese evergreen broad-leaved forests, but lower than values of a tropical rain forest in southern China. The 1,531 woody stems surveyed in all four plots included a total of 72 species in 50 genera and 30 families. The most common families were Fagaceae, Rubiaceae and Euphorbiaceae. <I>Castanopsis sieboldii, Psychotria rubra</I> and <I>Styrax japonicus</I> were the most important species. <I>C. sieboldii</I>, the primary dominant tree, dominated the sprouting forest with a broad distribution of heights and contributed 54.9 % of the total basal area. The complexity of the layered stratification and high species diversity suggested that sprouting regeneration occurred in a progressive succession, and the stands of both burned and non-burned may evolve into a stand similar to the primary forest before clearcut.

Journal

  • Journal of the Japanese Society of Revegetation Technology

    Journal of the Japanese Society of Revegetation Technology 32(2), 337-345, 2006-11-30

    The Japanese Society of Revegetation Technology

References:  34

Codes

  • NII Article ID (NAID)
    110005519466
  • NII NACSIS-CAT ID (NCID)
    AN10130633
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    09167439
  • NDL Article ID
    8584483
  • NDL Source Classification
    ZR21(科学技術--農林水産--林産) // ZN1(科学技術--建設工学・建設業)
  • NDL Call No.
    Z18-1223
  • Data Source
    CJP  NDL  NII-ELS  J-STAGE 
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