CAJ | 학술논문

以尾巨桉(DH32-29)幼苗为试验材料，以植株的生长指标(苗高、地径、叶面积)、生物量、根冠比、氮平衡指数(NBI)、叶绿素相对含量(SPAD 值)、丙二醛(MDA)含量和叶绿素荧光参数为指标，通过盆栽试验设置8个10~140 mg·kg-1浓度镉(Cd)盐溶液处理，研究了不同浓度 Cd 胁迫处理下尾巨桉幼苗的形态和生理特性变化规律。结果显示：低浓度(10 mg·kg-1)Cd 处理对尾巨桉幼苗的形态和生理特性无明显影响。当 Cd 浓度大于20 mg·kg-1，随着 Cd浓度的逐渐增大，其对尾巨桉幼苗的伤害程度也逐渐增加，主要表现为：植株生长缓慢、生物量减小、叶绿素相对含量和叶绿素荧光参数(Fv/Fm、φPSⅡ、NP、NBI)均下降，qP 无明显变化， MDA 含量升高。Cd 浓度大于60 mg·kg-1以上时，尾巨桉幼苗生长出现一定程度上的损伤症状和生长停滞现象。结果表明低浓度(≤20 mg·kg-1)Cd处理下尾巨桉幼苗能正常生长，随着浓度的增大，Cd 处理对尾巨桉的形态和生理特性造成显著影响。同时结合部分桉树适生区土壤 Cd 含量调查及相关研究结果认为，尾巨桉具有一定修复 Cd 污染区土壤的潜力。
이미거안(DH32-29)유묘위시험재료，이식주적생장지표(묘고、지경、협면적)、생물량、근관비、담평형지수(NBI)、협록소상대함량(SPAD 치)、병이철(MDA)함량화협록소형광삼수위지표，통과분재시험설치8개10~140 mg·kg-1농도력(Cd)염용액처리，연구료불동농도 Cd 협박처리하미거안유묘적형태화생리특성변화규률。결과현시：저농도(10 mg·kg-1)Cd 처리대미거안유묘적형태화생리특성무명현영향。당 Cd 농도대우20 mg·kg-1，수착 Cd농도적축점증대，기대미거안유묘적상해정도야축점증가，주요표현위：식주생장완만、생물량감소、협록소상대함량화협록소형광삼수(Fv/Fm、φPSⅡ、NP、NBI)균하강，qP 무명현변화， MDA 함량승고。Cd 농도대우60 mg·kg-1이상시，미거안유묘생장출현일정정도상적손상증상화생장정체현상。결과표명저농도(≤20 mg·kg-1)Cd처리하미거안유묘능정상생장，수착농도적증대，Cd 처리대미거안적형태화생리특성조성현저영향。동시결합부분안수괄생구토양 Cd 함량조사급상관연구결과인위，미거안구유일정수복 Cd 오염구토양적잠력。
Cadmium is one of the most common heavy metals causing soil contamination problems. Bioremediation is an effective way to rehabilitate soils contaminated with this comp. An pot trial was conducted to measure various morphological and physiological indices of Eucalyptus urophylla × E. grandis (DH32-29) grown under treatments of eight different soil concentrations of Cadmium (Cd) ranging from 10 to 140 mg·kg-1. There were no significant differences found among seedling grown at low concentration (10 mg·kg-1) of Cd and the control (i.e. no Cadmium). Under higher Cd concentrations (>20 mg·kg-1) seedling growth was significantly impacted. As Cd concentration increases, the biomass, chlorophyll content, fluorescent parameter (PSⅡ), maximum photochemical quantum yield (Fv/Fm), efficiency of PS Ⅱ photochemistry (φPS Ⅱ ), non-photochemical quenching coefficient (Np) and nitrogen balance index (NBI) decreased, photochemical quenching (qP) showed little change, whilst malondialdehyde (MDA) increased. Seedlings of clone DH32-29 show clear visible symptoms of injury at levels above 20 mg·kg-1 and at plant growth stagnated at Cd concentration exceeding 40 mg·kg-1. It was concluded that DH32-29 seedlings can grow normally at lower Cadmium concentrations (≤20 mg·kg-1). But as the concentration increases, above this level, the morphological and physiological characteristics of seedlings start to display significant impacts. Surveys of soil Cadmium levels in areas suited to Eucalyptus plantations and related research results in combination with this current study illustrate the potential soil remediation value of DH32-29 for areas where soils are affected by Cd pollution.