報告書番号

482014

タイトル（和文）

富山県新湊市附近のカキとカエデの梢端の枯損と早期落葉についての考察，塩風害，大気汚染

タイトル（英文）

SURVEY REPORT ON THE ACTUAL CONDITIONS OF WITHERING OF TERMINAL TWIGS AND PREMATURE LEAF FALL OF JAPANESE PERSIMMONTREE AND MAPLE TREE AROUND SHINMINATO OF TOYAMA PREFECTURE

概要 （図表や脚注は「報告書全文」に掲載しております）

１９７９年秋頃，富山新港火力発電所周辺で，カキやカエデの梢端の枯損や早期落葉の発生がみられた。本調査は，これら樹木の梢端の枯損や早期落葉の実態を把握し，その因果関係を明らかにしようとしたものである。カキやカエデの梢端の枯損や早期落葉は１９８０年秋期にも発生し，その程度は海岸に近いほど著しく，海岸から遠ざかるにつれて低下した。両樹種とも年に数回の台風に見舞われ，その時の主風向に対して直面する部分に早期落葉や梢端の枯損がみられた。なお樹木葉の全硫黄含有率と酸化鉛法による大気汚染度との相関は認められなかった。以上の結果から１９７９年秋頃に発生したカキやカエデの梢端の枯損や早期落葉は，台風による機械的損傷と塩風による塩分の葉内への浸透による被害が一次的要因と推定される。これに二次的に病虫害が発生し，被害が助長されたものと考えられる。

概要 （英文）

IN AUTUMN OF 1979 OCCURRENCES OF WITHERING OF TERMINAL TWIGS AND PREMATURE LEAF FALL OF JAPANESE PERSIMMON TREES AND MAPLE TREES WERE OBSERVED AROUND THE TOYAMASHINKO OIL-FIRED THERMAL POWER PLANT.THIS STUDY WAS CONDUCTED TO INVESTIGATE THE ACTUAL CONDITIONS OF TERMINAL TWIG WITHERING AND PREMATURE LEAF FALL OF THESE TREES ANDTO CLARIFY THE CAUSES OF THESE DAMAGES.THE RESULTS ARE SUMMARIZED AS FOLLOWS: OCCURRENCES OF TERMINAL TWIG WITHERING AND PREMATURE LEAF FALL OF JAPANESE PERSIMMON TREES AND MAPLE TREES WERE ALSO OBSERVED IN THE SURVEY AREA IN AUTUMN OF 1980.THE DEGREE OF THE DAMAGE WAS MORE SERIOUS IN THE CASE LOCATED CLOSER TO THE SEA SHORE. BOTH SPECIES WERE HIT BY TYPHOON SEVERAL TIMES IN THE YEAR.PREMATURE LEAF FALL AND TERMINAL TWIG WITHERING WERE OBSERVED IN SOME PARTS OF TREES WHICH WERE DIRECTLY EXPOSED TO THE MAIN WIND DIRECTION OF TYPHOONS. ANY SIGNIFICANT CORRELATIONOF THE TOTAL SULPHUR CONTENT OF TREE LEAVES WITH THE DEGREE OF AIR POLLUTION MEASURED BY THE LEAD DIOXIDE METHOD WAS NOT OBSERVED. ON THE BASIS OF ABOVE-MENTIONED FINDINGS,IT WAS CONCLUDED THAT OCCURRENCES OF TERMINAL TWIG WITHERING AND PREMATURE LEAF FALL OF JAPANESE PERSIMMON TREES AND MAPLE TREES IN AUTUMN OF 1979 WERE PRIMARILY CAUSED BY MECHANICALDAMAGES INFLICTED BY TYPHOONS AND OSMOSIS OF SALINITY INTO THE LEAVES AND THAT THE DAMAGES WERE AGGRAVATED SECONDARILY BY DISEASES AND INSECTS.

報告者

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