Korean Journal of Agricultural and Forest Meteorology (한국농림기상학회지)

Korean Society of Agricultural and Forest Meteorology (한국농림기상학회)
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Changes of Physiological Properties of Zelkova serrata to NaCl Concentration in Soil

토양 중 NaCl 농도에 따른 느티나무의 생리적 특성 변화

  • Published : 2003.09.01
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Abstract

This study was conducted to investigate the negative physiological impact of saline to roadside trees and to assess the physio-biochemical tolerant characters of woody plants against salinity. Two-year-old Zelkova serrata seedlings treated with 0, 3, 14, 56, and 112 mM NaCl were measured for root collar diameter and cambial electric resistance (as an indication of vitality) and analyzed for carbohydrate and mineral content in the leaves. Z. serrata was affected by NaCl treatments. The vitality of Z. serrata decreased with an increase in NaCl concentration, and the NaCl treatment resulted in nutrient imbalance shown by changes of ion concentration in the tissues. However, relative growth rate for diameter and carbohydrate metabolism in the leaves were not greatly influenced by NaCl treatment. Short-term treatment or low NaCl concentration may not have an observed impact on growth. Nevertheless, roadside trees exposed to saline during the long term would likely show negative effects for growth performance from altered ion concentrations.

본 연구는 가로수의 염류 피해 원인을 밝히고, 생리생화학적 내성 특성을 구명하고자 하였다. 공시재료는 2년생 느티나무를 사용하였으며, NaCl을 0, 3, 14, 56, 112mM로 토양에 처리한 후, 근원경, 형성층 전기저항치와 잎 내 탄수화물 및 이온 함량 등을 측정하여 생리적인 피해 반응을 비교 분석하였다. 느티나무는 NaCl처리에 의해 생리적인 대사과정이 저해를 받은 것으로 나타났다. 특히 염류농도가 증가함에 따라 활력이 감소하였으며, 체내 이온농도가 변하여 이온 불균형이 발생하였다. 이러한 결과는 염류 처리에 의해 식물의 뿌리에서 수분 흡수력이 저해되면서 수분 스트레스가 유발되었기 때문인 것으로 판단된다. 반면 생장과 체내 탄수화물 대사에는 큰 영향을 주지 않았는데, 이것은 NaCl 처리 농도가 너무 낮았거나 처리 기간이 너무 짧았기 때문인 것으로 판단된다. 그러나 느티나무 가로수가 장기적으로 염류에 노출되었을 경우, 생장에 심각한 장애가 발생할 것으로 예측된다.

Keywords

References

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