CAJ | 학술논문

利用盆栽试验对胡萝卜在不同浓度Cd/Zn及Cd/Zn/Ni复合作用下的重金属吸收效应进行了研究.结果表明,在Cd/Zn/Ni和Cd/Zn复合污染条件下,胡萝卜茎叶和块茎干重与对照土壤比较均受到显著影响(P＜0.05),尤其是含Ni组合,在Ni浓度达到250 mg·kg-1后,胡萝卜块茎和茎叶生物量都锐降(P＜0.01).对比不同剂量下两组合富集系数(EF)和转运系数(TF)的结果发现,含Ni组合中,Cd、Zn、Ni 3种重金属在不同迁移界面以及不同浓度水平时的活性不同:在土壤-胡萝卜块茎迁移界面,当土壤中Cd、Zn、Ni浓度分别在0.35～1.8、50～300 mg·kg-1以及60～250 mg·kg-1之间时,活性大小为Cd＞Zn＞Ni;当其浓度分别达到3.5 mg·kg-1(Cd)、600mg·kg-1(Zn)以及500mg·kg-1(Ni)时,活性大小变为Zn＞Ni＞Cd;而在胡萝卜块茎-茎叶界面,Cd的活性在任何浓度水平下始终最大,当Zn、Ni浓度分别在50-180 mg·kg-1以及60～170 mg·kg-1之间时,活性大小为Zn＞Ni,但在此浓度之后Ni的作用突显,活性大小变为Ni＞Zn.非含Ni组合中,在两迁移界面和不同浓度水平下,两种重金属的迁移能力始终为Cd＞Zn.此外,在碱性较高的绿洲灌淤土中,Cd、Zn、Ni之间的交互作用表现为Ni与Cd的拮抗作用,以及Ni与Zn的协同作用.
이용분재시험대호라복재불동농도Cd/Zn급Cd/Zn/Ni복합작용하적중금속흡수효응진행료연구.결과표명,재Cd/Zn/Ni화Cd/Zn복합오염조건하,호라복경협화괴경간중여대조토양비교균수도현저영향(P＜0.05),우기시함Ni조합,재Ni농도체도250 mg·kg-1후,호라복괴경화경협생물량도예강(P＜0.01).대비불동제량하량조합부집계수(EF)화전운계수(TF)적결과발현,함Ni조합중,Cd、Zn、Ni 3충중금속재불동천이계면이급불동농도수평시적활성불동:재토양-호라복괴경천이계면,당토양중Cd、Zn、Ni농도분별재0.35～1.8、50～300 mg·kg-1이급60～250 mg·kg-1지간시,활성대소위Cd＞Zn＞Ni;당기농도분별체도3.5 mg·kg-1(Cd)、600mg·kg-1(Zn)이급500mg·kg-1(Ni)시,활성대소변위Zn＞Ni＞Cd;이재호라복괴경-경협계면,Cd적활성재임하농도수평하시종최대,당Zn、Ni농도분별재50-180 mg·kg-1이급60～170 mg·kg-1지간시,활성대소위Zn＞Ni,단재차농도지후Ni적작용돌현,활성대소변위Ni＞Zn.비함Ni조합중,재량천이계면화불동농도수평하,량충중금속적천이능력시종위Cd＞Zn.차외,재감성교고적록주관어토중,Cd、Zn、Ni지간적교호작용표현위Ni여Cd적길항작용,이급Ni여Zn적협동작용.
A pot experiment was conducted to observe the effects of the bioavailability and uptake of heavy metals in different parts of carrots.This research tested 2 different combinations of heavy metals Cd/Zn/Ni and Cd/Zn.For each combination 8 different concentration scenarios were tested.The results showed that carrots'shoots and roots biomass were affected significantly(P＜0.05)by the Cd/Zn/Ni and Cd/Zn cocontamination combinations.For the Cd/Zn/Ni combination,all tissues of the carrots decreased sharply(P＜0.01)when the concentration of Ni reached 250 mg·kg-1.This result exhibited Ni significant influence on carrots'growth.The calculated transfer ratio from roots to soil(EF)and the transfer ratio of shoots to roots(TF)showed that the activity level(or bioavailability)of these heavy metals varied with the concentration of the co-contaminant combination within the soil.For the Cd/Zn/Ni combinations with concentrations of 0.35＜Cd＜1.8 mg·kg-1,50＜Zn＜300 mg·kg-1 and 60＜Ni＜250 mg·kg-1,Cd was the most bioavailable in the soil-roots interface.Zn was the next most bioavailable followed by Ni,i.e.in terms of bioavailability Cd＞Zn＞Ni.At a different concentration of the co-contaminants in the soil-roots interface,3.5 mg·kg-1Cd,600 mg·kg-1 Zn and 500 mg·kg-1 Ni,the bioavailability followed this order Zn＞Ni＞Cd.While in the roots-shoots interface,the bioavailability was from greatest to least Cd＞Zn＞Ni at concentrations of 0.35＜Cd＜1.25 mg·kg-1,50＜Zn＜ 180 mg·kg-～ and 60＜Ni＜170 mg.kg-1,but at higher concentrations for each heavy metal the bioavailability followed this order Cd＞Ni＞Zn.For co-contamination with the Cd-Zn combination,the bioavailability of these two heavy metals was always Cd＞Zn at all concentrations and interfaces.In addition,the interactions between Cd,Zn,and Ni were observed.Cd and Ni acted antagonistically and Zn and Ni acted synergistically with regards to uptake.