논문 상세보기
pp.500-509
겨울철 눈이 내린 도로의 동결을 방지하기 위해 염화칼슘을 제설제로 사용하는데 이것은 용해되어 도로주변의 수목에 피해를 줄 수 있다. 본 연구는 겨울철 제설제로 이용되는 염화칼슘 처리에 따른 복자기의 생장과 생리적 반응을 알아보기 위해 생장 특성, 광색소함량, 광합성 효율, 엽록소형광반응을 측정하고 식물체 및 토양 분석을 하였다. 실험구는 무처리(대조구), 9mM(0.5%), 18mM(1.0%), 54mM(3.0%)의 총 4개의 처리구로 나누어 용해액을 신초가 나기 전, 일주일 간격으로 2회 500ml씩 살포하였다. 염화칼슘 처리 결과, 처리 후 30일째 염화칼슘 농도가 증가함에 따라 0.5% 처리구부터 총엽록소함량, 광합성율, 증산율, 기공전도도, 광계 II활성이 감소하였고 특히 3.0% 처리구에서 두드러졌다. 반면, 엽록소a/b는 염화칼슘 농도가 높아짐에 따라 증가하였고 수분이용효율은 1.0% 처리구에서부터 증가하였다. 처리 후 50일째 3.0% 처리구는 고사하여 측정할 수 없었고, 모든 처리구에서 대조구에 비해 엽록소a, 엽록소b, 총엽록소함량, 광계II활성, 광계II광화학효율이 감소하였다. 이러한 결과는 Ca2+와 Cl-이 잎과 토양에 축적되어 수분의 흡수와 전자전달의 방해에 기인한 것으로 염화칼슘 처리구에서 수고생장율의 50% 이상 저하를 가져왔다. 염화칼슘의 처리 농도와 시기에 따른 차이는 있었지만 모든 염화칼슘 처리구에서 생장율은 감소하고 생리적 활성은 둔화되었고 이는 시간이 경과함에 따라 심해졌다.
To prevent freezing of the road by fallen snow, Calcium chloride(CaCl2) as a deicer is used to very often and it can be harmful to roadside trees. This study was conducted to investigate the effects of Calcium chloride(CaCl2) as a deicer on growth and physiological traits of Acer triflorum according to different concentration of CaCl2. We measured growth, chlorophyll contents, gas exchangement characteristics, chlorophyll fluorescence and mineral nutrition concentration in plant and soil. The experimental group was composed of four treatments including 0mM(control), 9mM(0.5 %), 18mM(1.0 %), 54mM(3.0 %). Before germinating new shoot, the dissolution of CaCl2 was irrigated twice interval of a week. At 30 days after treatment, all treatments decreased total cholorophyll content, photosynthetic rate, transpiration rate, stomatal conductance and photochemical efficiency(Fv/Fm) with increasing concentration of CaCl2 and especially, they significantly reduced in 3.0 % treatment. In contrast, chlorophyll a/b ratio increased with an increase of CaCl2 concentration and water use efficiency increased in 1.0 % and 3.0 % treatments. At 50 days after treatment, all treatments were decreased in chl a, chl b, total chlorophyll content, carotenoid content, photosynthetic capacity, photochemical efficiency(Fv/Fm) and quantum yield of photosystem II(ΦPSII) compared with control and 3.0 % treatments were withered. Ca2+ and Cl- were accumulated in leaves and soil, which inhibited water absorption and electron transport and it caused the reduction of height growth rate more than 50 %. Although there was a little difference according to time and CaCl2 concentration, all treatments decreased in growth rate and physiological activity slowed down. As time passed, these results got worse. Therefore we need to take a measure earlier in order to minimize damage of trees.
