本文關(guān)鍵詞： 重金屬 Pb Zn 復(fù)合污染 遷移轉(zhuǎn)化 綠洲土壤　出處：《干旱區(qū)資源與環(huán)境》2017年06期 　論文類型：期刊論文

【摘要】：以干旱綠洲土壤為研究對(duì)象,采用盆栽實(shí)驗(yàn)探究外源Pb-Zn復(fù)合脅迫下,重金屬對(duì)胡蘿卜生長(zhǎng)形態(tài)的影響及兩種元素在研究區(qū)土壤-胡蘿卜中的遷移轉(zhuǎn)化特征。結(jié)果表明:隨著脅迫濃度的增大,胡蘿卜葉長(zhǎng)隨之降低,根長(zhǎng)變化不明顯,干重變化呈"低促高抑"態(tài)勢(shì)。從兩種重金屬的積累特征看:胡蘿卜對(duì)Pb、Zn的富集系數(shù)(BCF)均小于1,遷移系數(shù)(TF)均大于1,即兩種重金屬在整個(gè)遷移系統(tǒng)中的運(yùn)移界面主要位于根-葉之間,且根-葉間遷移能力大小為:ZnPb。通過(guò)對(duì)比分析發(fā)現(xiàn)兩種元素交互作用為:Pb對(duì)于Zn的富集和遷移均產(chǎn)生拮抗作用;Zn的共存對(duì)Pb的遷移是協(xié)同作用,但對(duì)其富集作用的影響表現(xiàn)為:低濃度拮抗,高濃度協(xié)同。
[Abstract]:The pot experiment was conducted to investigate the effects of exogenous Pb-Zn on the soil of arid oasis. The effects of heavy metals on the growth of carrot and the characteristics of migration and transformation of the two elements in the soil and carrot were studied. The results showed that the leaf length of carrot decreased with the increase of stress concentration, but the change of root length was not obvious. According to the accumulation characteristics of two kinds of heavy metals, the enrichment coefficient (BCFs) of Pb ~ (2 +) Zn in carrot is less than 1, and the transfer coefficient (TFF) is higher than 1, that is, the migration interface of two heavy metals in the whole migration system. Mainly between the roots and leaves, The root-leaf migration ability was about 1: ZnPb. the results showed that the interaction of the two elements was that the accumulation and migration of Zn were antagonistic to the accumulation and migration of Zn, and that the coexistence of Zn was a synergistic effect on the migration of Pb. However, the effects on its enrichment were as follows: low concentration antagonism and high concentration synergism.
【作者單位】： 甘肅省環(huán)境污染預(yù)警與控制重點(diǎn)實(shí)驗(yàn)室蘭州大學(xué)資源環(huán)境學(xué)院;
【基金】：中央高�；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金(lzujbky-2015-144223000-861952) 國(guó)家自然科學(xué)基金項(xiàng)目(No.51178209)資助
【分類號(hào)】：X56;X53
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本文編號(hào)：1497956