Characteristics of Annual Rings of Pinus thunbergii Grown in the Air-polluted Area by Soft X-ray Analysis

Soft X-ray분석(分析)에 의한 대기오염지역(大氣汚染地域)에서 자란 해송(Pinus thunbergii)의 연륜(年輪)의 특징(特徵)

  • Kim, Jong Kab (College of Agriculture, Gyeongsang National University) ;
  • Kim, Jai Saing (College of Agriculture, Gyeongsang National University)
  • Received : 1991.08.20
  • Published : 1991.12.31

Abstract

Annual ring characteristics of pinus thunbergii grown in several air-polluted areas were investigated by soft X-ray densitometry. Ring width, maximum density and relative difference between maximum and minimum density(abbreviated to DD) were generally decreased after the beginning of operation of the factories at the vicinity of the pollution sources. Especially at the nearest areas of the industrial complex, those were distinctly decreased, and the changes, either increases or decreases, in percentage of latewood and minimum density could not be explained by the air pollution dosages. Ring width, maximum density and DD were being more apparently decreased after 5 years than those for 5 years after the beginning of operation, and also the rate of decrease was increased from after 5 years after the beginning of operation, and the rate of decrease of ring width was the highest of all. It was inferred that ring width, maximum density and DD of Pinus thunbergii could be used as indicators to detect the growth damage by air pollution.

Soft X-ray에 의한 연륜밀도해석법(年輪密度解析法)으로 대기오염지역(大氣汚染地域)에서 자란 해송(Pinus thunbergii) 성목(成木)의 연륜(年輪)에 대한 특징(特徵)을 알아본 결과, 연륜폭(年輪幅)과 대기밀도(最大密度), 최대밀도(最大密度)와 최소밀도(最小密度)의 차(差)(이하DD)는 공장이 가동된 이후 오염원(汚染源)의 주변지역에서는 감소하는 경향을 나타내었으며 특히 오염원(汚染源)에서 가장 가까운 지역(地域)에서 가장 뚜렷히 감소하고 있었고 추재율(秋材率)과 최소밀도(最小密度)는 오염(汚染)으로 인한 감소와 증가의 뚜렷한 특징을 나타내지 않았다. 또한 연륜폭(年輪幅) 및 최대밀도(最大密度), DD는 공장가동직후 5년동안보다도 5년이후부터 더욱 감소되고 있었으며 감소율(減少率) 역시 공장가동 5년이후 부터 증가되었고 연륜폭(年輪幅)의 감소율(減少率)이 가장 컸다. 이와같이 본조사를 통하여 본 해송의 연륜폭(年輪幅) 및 최대밀도(最大密度), DD는 오염으로 인한 생장저해(生長沮害)의 지표(指標)로서 이용할 수 있다고 추측되었다.

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