都市に生育する巨木の生理状態とフェノロジー特性  [in Japanese] Physiological status and phenology of big-sized trees in the urban area  [in Japanese]

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Abstract

高齢大型となった巨樹・老木が都市域でどのような生理的・外観的特性を示すかを明らかにする目的で、東京都区部に生育するイチョウ、ケヤキ、クスノキ、ユリノキおよびスダジイの胸高周囲長3m以上の巨木と1m以下の中径木を供試木として、水分生理状態、葉の養分濃度、クロロフィル量、クロロフィル蛍光、樹幹表面温度、フェノロジーの計測観察を行った。どの樹種でも、巨木の方が中径木より水分生理状態が悪く、カリウム、マグネシウム濃度が低く、クロロフィル量が少なかった。SPAD値は、スダジイを除く4樹種で巨木の方が中径木より低かった。クロロフィル蛍光には、巨木と中径木で差は認められなかった。巨木と中径木の樹幹表面温度の日変動を比べたところ、巨木の樹幹表面温度が高い傾向が認められた。また、どの樹種でも巨木の黄葉、黄葉終了、落葉が早く、黄葉-落葉期間が長いという傾向が認められた。開芽・展葉の傾向は樹種により異なっていた。巨木は中径木とは明らかに異なる生理状態やフェノロジーを示すといえる。

To study the characteristics of big-sized trees, physiological status such as water relations, foliar nutrient concentrations, chlorophyll contents, chlorophyll fluorescence, stem surface temperature and phenology of big-sized trees (girth at breast height 3m over) and middle-sized trees (girth at breast height 1m under) were measured. Observed trees were Ginkgo biloba, Zelkova serrata, Cinnamomum camphora, Liriodendron tulipifera and Castanopsis sieboldii. In all the samples of big-sized trees, the water relations, foliar nutrient concentrations and chlorophyll contents were significantly lower than those of middle-sized trees. SPAD values of big-sized trees were also lower than those of middle-sized trees except for C. sieboldii. The quantum yields of photosystem II calculated from chlorophyll fluorescence of big-sized trees did not differ significantly from those of middle-sized trees. Stem surface temperature of big-sized trees was generally higher than that of middle-sized trees. The time of bud-break and leaf-unfolding varied among species. The earliest leaf coloring, the earliest defoliation, the longest coloring-defoliation period were all observed in big-sized trees. The characteristics of big-sized trees clearly appears in water and nutrient status and phenology.

Journal

  • Journal of tree health

    Journal of tree health 5(1), 1-11, 2001-03-31

    樹木医学研究会

References:  25

Cited by:  1

  • Comparison among phenologies at three sites in Tokyo in three road-side tree species  [in Japanese]

    TAKAHASHI So , MATSUSHITA Norihisa , HOGETSU Taizo , So Takahashi , Norihisa Matsushita , Taizo Hogetsu , 東京大学大学院農学生命科学研究科 , 東京大学大学院農学生命科学研究科 , 東京大学大学院農学生命科学研究科 , Graduate school of Agricultural and Life Sciences The University of Tokyo , Graduate school of Agricultural and Life Sciences The University of Tokyo , Graduate school of Agricultural and Life Sciences The University of Tokyo

    樹木医学研究 = Journal of tree health 11(4), 194-195, 2007-10-31

    IR  References (3)

Codes

  • NII Article ID (NAID)
    110007861086
  • NII NACSIS-CAT ID (NCID)
    AA11493506
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    13440268
  • NDL Article ID
    5912681
  • NDL Source Classification
    ZR3(科学技術--生物学--植物)
  • NDL Call No.
    Z74-B105
  • Data Source
    CJP  CJPref  NDL  NII-ELS  IR 
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