Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Heavy Metal Concentrations in Tree Ring Layer and Soil and Tree Ring Growth of Roadside Trees in Seoul

서울시 가로수의 연륜층 및 식재주변 토양의 증금속 농도와 연륜 생장

  • Yoo, Jae-Yun (Division of Environmental Science and Ecological Engineering, Korea University) ;
  • Son, Yo-Whan (Division of Environmental Science and Ecological Engineering, Korea University)
  • 유재윤 (고려대학교 환경생태공학부) ;
  • 손요환 (고려대학교 환경생태공학부)
  • Published : 2003.06.30
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Abstract

This study was carried out to examine the heavy metal concentrations in soils under roadside trees and tree ring layers, and to investigate the relationship between heavy metal concentrations and tree ring growth of roadside trees in Seoul. Soil samples at $0{\sim}20\;cm$ depth and tree line were collected from Platanus occidentalis and Ginkgo biloba at nine streets, and pH and heavy Metal concentrations were analyzed. Soil pH ranged from 6.62 to 8.01 and soil heavy metal concentrations under roadside trees were higher (Zn 109.03, Pb 26.49 and Cu 44.98 mg/kg) compared with those of the referred forest soils. Soils at Cheonggye2ga street showed the highest heavy metal concentrations, and seemed to be related to heavy traffic and dense hardware stores. Tree ring width significantly decreased from 1979 through 2000 for both species. There were positive correlations between Cr, Pb and Cu concentrations in soils and tree ring layers for P. occidentalis and Ni for G. biloba. However, there were negative correlations between Cr concentration in tree ring layers and tree ring width for P. occidentalis, and Ni and Cu for G. biloba. Also there were no significant correlations between climatic factors in Seoul and tree ring width.

본 연구는 서울 도심에 위치한 가로수 중에서 수령이 30년 이상 된 양버즘나무(Platanus occidentalis L.)와 은행나무(Ginkgo biloba L.)를 대상으로 토양 및 가로수의 연륜층별로 중금속 농도를 분석하여 이들 중금속이 가로수의 연륜 생장에 미치는 영향 정도를 비교 검토하였다. 가로수가 식재되어 있는 토양의 pH는 $6.62{\sim}8.01$이었으며, 중금속 평균농도는 Cr 0.63, Zn 109.03, Pb 26.49, Ni 1.98, Cu 44.98 mg/kg으로써 이 중 Zn, Pb, Cu의 농도는 일반 산림토양보다 높은 것으로 나타났다. 특히 금속 및 철물을 취급하는 상가가 밀집해 있고 차량통행이 많은 청계 2가 지역의 중금속 농토가 가장 높게 나타났다. 가로수의 연륜폭을 1979년부터 2000년까지 측정하여 회귀식으로 나타낸 결과, 두 수종 모두 감소하는 경향을 보였다. 또한, 토양 내 Cr, Pb, Cu의 농도는 양버즘나무의 최근 5년간 연륜층 내 Cr, Pb, Cu 농도와 양의 상관관계를 보였으며, 토양 내 Ni 농도는 은행나무의 연륜층 내 Ni 농도와 양의 상관관계를 보였다. 양버즘나무의 5년 단위 연륜층별 Cr 농도와 은행나무의 5년 단위 연륜층별 Ni, Cu 농도는 각각 연륜생장에 음의 상관관계를 나타냈다. 한편 서울지역의 연평균 기온, 강수량, 강수일수와 연륜폭의 연도별 변화 경향은 유사하였으나 통계적으로 유의성은 인정되지 않았다.

Keywords

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  1. Eco-physiological Responses of Roadside Tree Species to Contamination of Soil with Lead vol.2, pp.3, 2015, https://doi.org/10.17820/eri.2015.2.3.237