造園樹木の亜硫酸ガス抵抗性に関する研究(第1報) : 亜硫酸ガス抵抗性の季節的変異について Studies on the Resistance of Garden Trees and Shrubs Against Sulphur Dioxde (I) : Seasonal Changes in the Resistance of Garden Trees and Shrubs

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イ)本研究は造園樹木の亜硫酸ガス抵抗性の季節的変異を究明し,都市における造園樹木の利用および保護,管理面に貢献することを目的として行われた。供試樹木としてカマクラヒバ,マサキ,サツキツツジを用い,その3〜4年生苗木を鉢植として,1972年5月より1年間,隔月毎に公害実験用グロースキャビネット内にて亜硫酸ガスを接触させて,植物の被害状況およびその後の生育状態を調査した。また灌水による被害軽減効果を検討した。ロ)実験結果から,供試樹木の亜硫酸ガス抵抗性は冬季(1月)およびそれに続く時期(3月)がもっとも強く,冬季に入る直前(11月)も抵抗性が強くなっている。逆に夏季(7月)がもっとも弱く,それに続く時期(9月)も弱いが,夏季に入る直前(5月)は種類によって被害の出現度が異なる。ハ)被害度の1指標とした落葉率はほぼ観察による被害度と同じ傾向を示す。ニ)処理後の生育をみると,枯死したものはなく,いずれも回復している。3月現在でカマクラヒバはすべて正常に生育し,マサキ,サツキツツジは7月および11月処理区を除いてほぼ正常に戻っている。7月区は被害による落葉後の新葉の萠出が遅れ,11月区も落葉期が冬にかかったために新葉が萠出していない。ホ)灌水による被害軽減効果はあまり認められない。へ)供試樹木の亜硫酸ガス抵抗性は,全般を通じてカマクラヒバが非常に強く,次いでマサキ,サツキツツジの順である。

In recent years many efforts have been made in the study of the resistance of trees and shrubs against sulphur dioxide. However, the seasonal changes of the resistance have never been given a proper attention, especially on report ever handled this change in the resistance of garden trees and shrubs over a period of one year. The purpose of this study is to investigate the seasonal changes in the resistance of garden trees and shrubs against sulphur dioxide, thus contributing to the problems of protection and maintenance of garden trees and shrubs in big cities, just when the role of plants in improving environmental conditions is beginning to draw wide attention. The following garden plants (on tree and two shrubs) were used as the test samples ; Kamakura-hiba Chamaecyparis obtusa Sieb. et Zucc. var. breviramea Beiss. Masaki Euonymus japonicus Thunb. Satsuki-tsutsuji Rhododendron indicum Sweet The author planted these samples and exposed them to 3 ppm of SO_2 for 3 hours under a given temperature in a growth cabinet for air-pollution experiments every other month for one year starting from May 1972, and observed the effects of the pollution and the state of growth after the disposure. Also, the author made a section where the plants were given an artificial shower (20mm/3mins.) after the exposure, and tried to observe effects of the watering in reducing the damages made by the pollution. The general outlines of the results of the experiment are as follows : 1. Resistance of the test plants against sulphur dioxide is strongest during winter (January) and in the month right after winter (March). Resistance is also fairly strong in the month right before winter(November). On the contrary, it is the weakest in summer (July) and also weak in the month of September. In the month right before summer (May) damages appear in different degrees among different samples. 2. The rate of falling leaves which the author took as an indication of the damage showed the same trend seen in., other features of damage. 3. Observation of growth of the plants after the disposure disclosed that no plant died : all of them recovered from the damage. As of March, all of Kamakura-hiba were growing normally, and Masakis and Satsuki-tsutsujis had returned to normal except those exposed in July and November. Those exposed in July were late in shooting out new leaves after the old ones had fallen, and those exposed in November shod their leaves toward the beginning of winter and consequently new leaves were not coming out yet. 4. No alleviating effects by watering were recognized. 5. Generally, resistance against sulphur dioxide was strongest in Kamakura-hiba, next strongest in Masaki, and weakest in Satsuki-tsutsuji.

収録刊行物

  • 造園雑誌

    造園雑誌 39(3), 29-33, 1976-01-24

    社団法人日本造園学会

各種コード

  • NII論文ID(NAID)
    110004660034
  • NII書誌ID(NCID)
    AN00133839
  • 本文言語コード
    JPN
  • ISSN
    03877248
  • NDL 記事登録ID
    1691632
  • NDL 刊行物分類
    RB64;M032
  • NDL 雑誌分類
    ZK2(芸術--建築)
  • NDL 請求記号
    Z11-315
  • データ提供元
    NDL  NII-ELS  J-STAGE 
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