樹木に対する酸性降下物の影響に関する実験的研究

DOI Web Site 被引用文献12件 参考文献129件

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タイトル別名
  • Experimental Studies on the Effects of Acid Deposition on Forest Tree Species.
  • ジュモク ニ タイスル サンセイ コウカブツ ノ エイキョウ ニ カンスル ジッケンテキ ケンキュウ

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抄録

Forest decline is one of the serious environmental problems worldwide. Although the causes and/or mechanisms of these phenomena are different among the sites, acid rain, acid fog and/or soil acidification due to acid deposition are considered to be environmental stresses relating to these phenomena in North America and Europe. Therefore, there are many experimental studies on the effects of acid deposition on growth, physiological functions and nutrient status of tree species native to Europe and North America. Over the past 10 years, on the other hand, several research institutes and universities in Japan have been conducting experimental studies on the effects of simulated acid rain and soil acidification on Japanese forest tree species.<BR>Exposure to simulated acid rain or fog with a p H of 4.0 or above for several months cannot induce any adverse effects on dry matter production and physiological functions of forest tree species. However, when the pH of simulated rain or fog is lowered below 4.0, negative effects appear on dry matter production and physiological functions in several sensitive forest tree species such as Japanese fir and Nikko fir. Based on limited information, it may be concluded that (1) Al dissolved into soil solution is the most important limiting factor for dry matter production, physiological functions and nutrient status of forest tree species grown in acidic soil, (2) the (Ca+Mg+K)/Al molar ratio in soil solution is a useful indicator to evaluate and predict the effects of soil acidification due to acid deposition on whole-plant dry matter production of forest tree species at the present time and in the future, and (3) Japanese coniferous tree species such as Japanese cedar and red pine are relatively sensitive to a reduction in (Ca+Mg+K)/Al molar ratio in soil solution compared with Norway spruce.<BR>To evaluate critical load of acid deposition for protecting Japanese forest ecosystems, further experimental studies are needed on the effects of acid deposition on growth physiological functions and nutrient status of Japanese forest tree species.

収録刊行物

  • 大気環境学会誌

    大気環境学会誌 36 (3), 137-155, 2001

    公益社団法人 大気環境学会

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