摘要
花卉修复重金属污染土壤,既能有效降低土壤重金属污染,又可美化环境,带来一定的经济效益。为探讨不同品种天竺葵(Pelargonium hortorum)对重金属的耐性,通过温室盆栽方式,研究了在土壤Cd污染和添加活化剂EDTA下,不同品种天竺葵对Cd耐性和富集特征。结果表明:(1)在Cd重金属胁迫下,除“迪娃玫粉渐变”外,其余8个品种天竺葵生长均受抑制,土壤添加活化剂EDTA后,对“地平线苹果红色”品种生长抑制最明显,但植株依然能保持生长;(2)9种天竺葵地上部分Cd含量和地下部分Cd含量分别为0.21~1.04 mg/kg和1.12~4.08 mg/kg,其中“迪娃树莓脉纹”和“地平线淡蓝色”地上部和根部Cd含量最高,“地平线淡蓝色”在添加活化剂后,地上部Cd含量相比较污染土上Cd含量增长了0.60 mg/kg;(3)“地平线绯红色”和“地平线玫瑰”地上部对Cd的富集系数达到最大值0.221,“地平线淡蓝色”根部对Cd的富集系数达到最大值1.700,添加活化剂后,“地平线淡蓝色”地上部与根部Cd的富集系数分别达到0.395和1.875;(4)“地平线玫瑰”和“地平线淡蓝色”在2种处理下,地上部Cd累积量达到最大值,分别为0.855μg/株和0.781μg/株,“迪娃玫粉渐变”在2种处理下根部Cd累积量达到最大,分别为3.632μg/株和3.262μg/株;(5)不同品种天竺葵植株内氮、磷、钾含量存在显著差异,Cd污染土壤在一定程度上促进了天竺葵对营养元素的吸收,其中“地平线绯红色”属于吸收氮磷钾较多的品种。综合生物量、Cd富集系数、营养元素分析,“迪娃玫粉渐变”、“地平线杂色”、“地平线玫瑰”和“地平线淡蓝色”4个品种对Cd都具有较好的吸收,不论是污染土壤还是污染土壤+EDTA上,在所筛选的品种中都有很大的优势。
Flower remediation of heavy metal contaminated soil can not only effectively reduce heavy metal pollution in soil,but also beautify the environment,bringing certain economic benefits.In order to investigate the tolerance of different Pelargonium hortorum varieties to heavy metals,the tolerance and accumulation characteristics of different Pelargonium varieties under Cd pollution and EDTA were studied by pot culture in greenhouse.The results showed that under Cd stress,the growth of 8 Pelargonium cultivars was inhibited except"Dewa Rose Powder Gradual Change".The growth of"Horizontal Apple Red"cultivars was inhibited most obviously by adding activator(EDTA)to the soil,but the plants couldstill grow.Cd content in the above ground part and the Cd content in the underground part of nine Pelargonium cultivars were 0.21~1.04 mg/kg and 1.12~4.08 mg/kg,respectively.The content of Cd in the above-ground and root parts of"Deva Raspberry Vein"and"Horizon Light Blue"were the highest,and the content of Cd in the above-ground part increased by 0.60 mg/kg compared with that in the polluted soil after adding activator.The enrichment coefficients of cadmium in the aboveground parts of"Horizon Rose"and"Horizon Pale Blue"reached the maximum of 0.221,and that in the root parts of"Horizon Pale Blue"reached the maximum of 1.700.After adding activator,the enrichment coefficients of cadmium in the aboveground parts and root parts of"Horizon Pale Blue"reached 0.395 and 1.875 respectively.Under the two treatments,the accumulation of cadmium in the shoot of“Horizon Rose”and root of"Horizon Blue"reached the maximum value,0.855μg/plant and 0.781μg/plant respectively,and the accumulation of cadmium in the root of"Dewa Rose Powder Gradual Change"reached the maximum,which was 3.632μg/plant and 3.262μg/plant respectively.There were significant differences in the contents of nitrogen,phosphorus and potassium in different varieties of geranium plants.In contrast,Cd-contaminated soil promoted the uptake of nutrients by geranium to a certain extent,among which"Horizon Scarlet"belonged to the species that absorbed more nitrogen,phosphorus and potassium.In terms of biomass,Cd enrichment coefficient and nutrient elements,the varieties of"Dewa Rose Powder Gradual Change","Horizon Variety","Horizon Rose"and"Horizon Light Blue"all have good absorption of Cd,and they have great advantages over both contaminated soil and contaminated soil+EDTA.
作者
王垚
李江遐
王冬良
李丁
马友华
WANG Yao;LI Jiangxia;WANG Dongliang;LI Ding;MA Youhua(College of Resources and Environment,Anhui Agricultural University,Hefei 230036,China;College of Horticulture,Anhui Agricultural University,Hefei 230036,China;Wuhu Gefeng Environmental Protection Technology Research Institute Co.LTD,Wuhu 241080,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2019年第10期148-154,共7页
Environmental Science & Technology
基金
安徽省科技重大攻关项目：农田重金属污染高效修复材料的开发与应用（17030701053）
安徽省重点研发专项（11008762）
关键词
天竺葵
重金属
CD
富集
geranium
heavy metals
Cd
enrichment
