CAJ | 학술논문

利用盆栽试验研究了干旱区污染绿洲土壤中Cd和Zn形态分布与生物有效性.结果表明:少量的Cd和Zn有促进油菜生长的作用,但高质量分数的Cd和Zn对油菜的生长有明显抑制作用;原状绿洲土壤中Cd和Zn形态以残渣态为主,随着绿洲土壤中Cd和Zn污染程度的加深,Cd和Zn各形态分布发生了显著变化,其中碳酸盐结合态Cd和Zn和铁锰氧化物结合态Cd和Zn质量分数大幅增加,并逐渐占据绝对优势,而残渣态Cd和Zn质量分数则几乎不变.相关分析表明土壤中的铁锰氧化物结合态Cd质量分数与油菜叶和根部的Cd质量分数呈极显著相关,表明土壤中的铁锰氧化物结合态Cd对油菜叶和根部累积Cd有最大贡献;铁锰氧化物结合态Zn和有机物结合态Zn分别与油菜根部和叶部的Zn质量分数呈极显著相关,表明土壤中铁锰氧化物结合态Zn和有机物结合态Zn分别对油菜根和叶部累积Zn贡献最大;油菜叶和根部Cd的富集系数均大于Zn的,表明油菜吸收Cd的能力大于Zn的;两种金属的富集系数叶部的均大于根部的,表明Cd和Zn的迁移性较强,且Cd在油菜中的迁移能力大于Zn的,其毒害作用也相应大于Zn的.两种金属主要累积在油菜可食用的叶部,因此对人体健康有潜在威胁.
이용분재시험연구료간한구오염록주토양중Cd화Zn형태분포여생물유효성.결과표명:소량적Cd화Zn유촉진유채생장적작용,단고질량분수적Cd화Zn대유채적생장유명현억제작용;원상록주토양중Cd화Zn형태이잔사태위주,수착록주토양중Cd화Zn오염정도적가심,Cd화Zn각형태분포발생료현저변화,기중탄산염결합태Cd화Zn화철맹양화물결합태Cd화Zn질량분수대폭증가,병축점점거절대우세,이잔사태Cd화Zn질량분수칙궤호불변.상관분석표명토양중적철맹양화물결합태Cd질량분수여유채협화근부적Cd질량분수정겁현저상관,표명토양중적철맹양화물결합태Cd대유채협화근부루적Cd유최대공헌;철맹양화물결합태Zn화유궤물결합태Zn분별여유채근부화협부적Zn질량분수정겁현저상관,표명토양중철맹양화물결합태Zn화유궤물결합태Zn분별대유채근화협부루적Zn공헌최대;유채협화근부Cd적부집계수균대우Zn적,표명유채흡수Cd적능력대우Zn적;량충금속적부집계수협부적균대우근부적,표명Cd화Zn적천이성교강,차Cd재유채중적천이능력대우Zn적,기독해작용야상응대우Zn적.량충금속주요루적재유채가식용적협부,인차대인체건강유잠재위협.
Pot experiment was conducted to study the distribution of cadmium, zinc fractionations and their availability to the rape in arid oasis soil in northwest China. The result showed that lower concentrations of Cd and Zn could promote rape growth, but higher concentrations could obviously inhibit rape growth.Cd and Zn fractionations in the uncontaminated oasis soil existed almost in the residual fractionation, but with Cd and Zn pollution degree rising in the oasis soil, Cd and Zn fractionations distribution changed significantly, in which carbonate-bound and Fe-Mn oxide-bound Cd and Zn concentrations were significantly increased and gradually occupied the absolute superiority. however, the residual Cd and Zn concentrations were almost unchanged. The significant correlation was found between Fe-Mn oxide-bound Cd concentration and Cd concentration in rape leaves and roots, which showed that Fe-Mn oxide-bound Cd made the greatest contribution to Cd accumulation in rape leaves and roots. Similarly, there was a significant correlation between Fe-Mn oxide-bound Zn and organic-bound Zn concentrations and concentrations in rape leaves and roots, respectively, suggesting that Fe-Mn oxide-bound Zn and organic-bound Zn made the greatest contributions to Zn accumulation in rape leaves and roots, respectively. The Bio-concentration Factors (BCF) of Cd in rape leaves and roots were all greater than Zn, which showed that the uptake capability of Cd in the rape was greater than Zn. moreover, the BCFs of the two metals in leaves were greater than in roots, which showed that Cd and Zn had the stronger migration capability and the transferring capability of Cd in the rape was greater than Zn. Also, the toxic effect of Cd was greater than Zn, and the two metals mainly accumulated in the edible leaves. Therefore, Cd and Zn present potential risks to human health.