本文選題：大寶山　切入點(diǎn)：土壤重金屬　出處：《土壤》2017年01期 　論文類型：期刊論文

【摘要】：對(duì)金屬礦山選冶活動(dòng)影響的農(nóng)田土壤,不同灌溉水源會(huì)影響重金屬的分布累積特征。根據(jù)實(shí)際情況將大寶山礦區(qū)農(nóng)田土壤分為污水灌溉區(qū)、清水灌溉區(qū)、自然修復(fù)區(qū)和對(duì)照區(qū),并進(jìn)行土壤和植物樣品采集,調(diào)查研究了土壤的基本理化性質(zhì),Cd、Pb、Cu、Zn、Mn 5種重金屬的含量和化學(xué)形態(tài)分布,以及不同區(qū)域植物中重金屬的含量。結(jié)果表明:污灌區(qū)Cd、Pb、Cu、Zn的含量最高,是自然修復(fù)區(qū)和清水灌溉區(qū)的1.75倍~10.51倍,對(duì)照區(qū)最低;Mn在各采樣點(diǎn)的含量無(wú)顯著差別。土壤Cd、Cu、Zn、Pb含量?jī)蓛芍g顯著正相關(guān),Mn與Cu、Zn、Cd、Pb呈負(fù)相關(guān)關(guān)系;土壤pH與重金屬環(huán)境有效態(tài)關(guān)系密切。殘?jiān)鼞B(tài)是5種重金屬的主要存在形態(tài),有機(jī)態(tài)含量也較高;Cd的環(huán)境有效態(tài)含量占總量的比例是其他4種重金屬的2倍左右。稻米中5種重金屬在清水灌溉區(qū)的含量均比污水灌溉區(qū)低,其中Cu和Zn的含量在兩區(qū)域均未超標(biāo)(NY861-2004),而Pb和Cd的含量嚴(yán)重超標(biāo)。重金屬在自然修復(fù)區(qū)和清水灌溉區(qū)呈現(xiàn)較低的土壤污染和人體健康風(fēng)險(xiǎn),該研究數(shù)據(jù)可為金屬礦區(qū)土壤污染控制提供科學(xué)的依據(jù)。
[Abstract]:The distribution and accumulation characteristics of heavy metals are affected by different irrigation water sources for farmland soils affected by metal mining activities. According to the actual situation, farmland soils in Dabaoshan mining area are divided into sewage irrigation area, clean water irrigation area, natural restoration area and control area. The soil and plant samples were collected, and the basic physical and chemical properties of the soil were investigated. The contents and chemical speciation of five heavy metals in the soil were investigated, and the contents of heavy metals in plants in different regions were also studied. The results showed that the content of CD PbPbCU Zn was the highest in the polluted irrigation area. It was 1.75 times and 10.51 times as much as that in the natural remediation area and the irrigated area, but the lowest mn content in the control area had no significant difference among the different sampling sites. There was a significant positive correlation between the Pb content of CD ~ (2 +) ~ (2 +) Cu ~ (2 +) and Cu ~ (2 +) Zn ~ (2 +) and a negative correlation between mn and CD ~ (2 +) ~ (2 +). The soil pH is closely related to the available forms of heavy metals in the environment, and the residual forms are the main forms of five heavy metals. The organic content of CD was also higher than that of the other four kinds of heavy metals, and the contents of five heavy metals in rice were lower than those in sewage irrigation areas. The contents of Cu and Zn were not in excess of NY861-2004, while the contents of Pb and CD were seriously exceeded in both regions. The heavy metals in the natural remediation area and the irrigated area of clean water showed lower soil pollution and human health risk. The data can provide scientific basis for soil pollution control in metal mining area.
【作者單位】： 華南師范大學(xué)化學(xué)與環(huán)境學(xué)院;
【基金】：國(guó)家自然科學(xué)基金委員會(huì) 廣東省人民政府聯(lián)合基金重點(diǎn)支持項(xiàng)目(U1201234) 國(guó)家自然科學(xué)基金項(xiàng)目(21347003) 廣東省自然科學(xué)基金項(xiàng)目(S2011010003356)資助
【分類號(hào)】：X53;X173

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