報告書番号

ET91005

タイトル（和文）

DEPOSITION IN JAPAN

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）

当所では，１９８７年から酸性雨に関する大気，土壌・陸水，植物の各分野を網羅する系統的な調査・研究を進めてきた。本報告書は，その結果明らかになったわが国の酸性雨とその環境影響の実態について取りまとめたものである。

概要 （英文）

ACIDIC DEPOSITION IN JAPAN BY THE CRIEPI RESEARCH GROUP ON ACIDIC DEPOSITION SYNOPSIS 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 WATERAND THE ATMOSPHERE. THE MOST SIGNIFICANT RESULTS ARE SUMMARIZED BELOW:(1)THE ANNUAL AVERAGE PH OF PRECIPITATION THAT HAS BEEN OBSERVED AT 20SITES 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 ACIDICDEPOSITION.

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