報告書番号

T91019

タイトル（和文）

酸性雨の実態調査

タイトル（英文）

ACIDIC DEPOSITION IN JAPAN

概要 （図表や脚注は「報告書全文」に掲載しております）

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概要 （英文）

SINCE 1987 WE HAVE EXTENSIVELY INVESTIGATED THE STATE OF ACIDIC DEPOSITION AND ITS EFFECTS IN JAPAN. THE STUDY HAS COVERED ALL OF THE RESEARCH AREAS RELEVANT TO ACIDIC DEPOSITION INCLUDING THOSE WHICH PERTAIN TO SOIL,FORESTS TERRESTRIAL WATER AND THE ATMOSPHERE. THE MOST SIGNFICANT RESULTS ARE SUMMARIZED BELOW: (1)THE ANNUAL AVERAGE PH OF PRECIPITATION THAT HAS BEEN OBSERVED AT 20 SITES ALL OVER THE JAPAN ARCHIPELAGO RANGED FROM 4.6 TO 5.2; (2)THE ANNUAL DEPOSITION OF SULFUR ON THE COUNTRY EXCEEDED ITS ANNUAL ANTHROPOGENIC EMISSION FROM THE COUNTRY,IMPLYING THE SIGNIFICANCE OF ITS TRANSPORT FROM OUTSIDE OF THE JAPAN ARCHIPELAGO, (3)THE ACID-NEUTRALIZING CAPACITY WAS DETERMINED FOR 500 SURFACE SOILS COLLECTED FROM ALL OVER THE JAPAN ARCHIPELAGO,AND THE SITES WERE CLASSIFIED INTO THREE SENSITIVITY CLASSES REGARDING ACIDIC DEPOSITION. (4)THE INPUT-OUTPUT BUDGET OF CHEMICAL CONSTITUENTS,EVALUATED AT TWO FOREST WATERSHEDS,REVEALED THAT THE WET DEPOSITION OF H+ WAS ONE ORDER OF MAGNITUDE LOWER THAN THE AMOUNT OF H+ PRODUCED IN SOIL BY BIOLOGICAL ACTIVITY; (5)THE DECLINE OF JAPANESE CEDAR WAS OBSERVED AT 5 OF THE 9 REGIONS INVESTIGATED,HOWEVER,IT WAS INFERRED THAT THE DECLINE WAS NOT ATTRIBUTED TO THE SOLE EFFECT OF ACIDIC DEPOSITION.

報告者

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