本文選題：重金屬 + 土壤�。� 參考：《農(nóng)業(yè)工程學(xué)報(bào)》2016年19期

【摘要】：該文選取拉林河流域表層土壤為研究對象,通過對土壤重金屬的含量和空間分布分析、污染評價(jià)、以及潛在生態(tài)風(fēng)險(xiǎn)評價(jià),了解土壤重金屬的分布特征和污染現(xiàn)狀,并利用正定矩陣因子分解法(PMF)探索土壤重金屬污染的來源。結(jié)果表明,表層土壤中Cr、As、Pb、Cu、Zn、Ni、Mn、V的平均含量均低于背景值,Co和Se略微高于背景值,部分土壤樣點(diǎn)Cd和Ni超過國家土壤環(huán)境質(zhì)量標(biāo)準(zhǔn)的二級標(biāo)準(zhǔn)。研究區(qū)土壤污染的主要金屬元素為Cd和Hg,地累積指數(shù)表明受到污染的樣品比例分別達(dá)到45.1%和37.0%,其潛在生態(tài)危害指數(shù)平均值分別為49.83和70.29。根據(jù)PMF計(jì)算結(jié)果,拉林河流域表層土壤重金屬累積主要受自然源、農(nóng)藥肥料源、工業(yè)排放源的影響。其中,自然本底對研究區(qū)土壤中重金屬的影響最大,貢獻(xiàn)率為38.0%,其次是農(nóng)藥和肥料施用,貢獻(xiàn)率為32.6%,燃煤和工業(yè)排放源的貢獻(xiàn)率稍低,為29.4%。
[Abstract]:In this paper, the surface soil of Lalin River Basin is selected as the research object. Through the analysis of the content and spatial distribution of soil heavy metals, the assessment of pollution, and the assessment of potential ecological risk, the distribution characteristics and pollution status of heavy metals in soil are understood. Positive definite matrix factorization (PMF) was used to explore the source of heavy metal pollution in soil. The results showed that the average contents of Cr ~ (2 +) -As-PbPbCu ~ (2 +) Zn ~ (2 +) mn ~ (2 +) in surface soil were lower than those of background value (Co) and se (se) slightly higher than that of background value, and CD and Ni in some soil samples exceeded the second grade standard of national soil environmental quality standard. The main metal elements of soil pollution in the study area were CD and Hg. The soil accumulation index showed that the proportion of contaminated samples reached 45.1% and 37.0 respectively, and the average values of potential ecological hazard index were 49.83 and 70.29, respectively. According to the results of PMF calculation, the accumulation of heavy metals in the surface soil of Lalin River Basin was mainly affected by natural sources, pesticide and fertilizer sources and industrial emission sources. The natural background had the biggest effect on the heavy metals in the soil of the study area, the contribution rate was 38.0%, the next was pesticide and fertilizer application, the contribution rate was 32.60.The contribution rate of coal combustion and industrial emission sources was slightly lower (29.4cm).
【作者單位】： 北京師范大學(xué)水科學(xué)研究院;
【基金】：國家科技重大專項(xiàng)(2014ZX07201-010) 國家自然科學(xué)基金資助項(xiàng)目(41303069)
【分類號】：X53

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本文編號：2061262