本文選題：Hg沉積　切入點(diǎn)：影響因子　出處：《中國環(huán)境科學(xué)》2017年03期

【摘要】：神農(nóng)架大九湖盆地距今16000年以來的泥炭沉積被用來分析Hg含量變化及其主要影響因子.基于剖面Ti、Al、Sc、Rb、Sr、Pb、Zn等元素含量和δ13C、腐殖化度等指標(biāo),主成分分析和逐步回歸分析揭示泥炭剖面Hg含量變化主要受大氣降塵、地表徑流作用下的礦物質(zhì)輸入、大氣降水、泥炭分解程度等因子影響.根據(jù)各因子影響Hg含量的強(qiáng)度隨年代(深度)變化以及剖面Hg含量變化,距今16000年以來大九湖泥炭剖面的Hg記錄可以分為6個(gè)階段.在階段Ⅰ(16.0~15.6cal kyr BP),Hg含量低值源于大氣降塵減少和泥炭分解程度降低;第Ⅱ階段(15.6~14.2cal kyr BP)大氣降水增加以及陸地生物量增多、陸源有機(jī)物輸入增多,導(dǎo)致Hg含量升高;階段Ⅲ(14.2~11.3cal kyr BP)Younger Dryas時(shí)期(YD,12.3~11.3cal kyr BP),因大氣降塵增多,泥炭分解程度增加,Hg含量較YD之前升高;第Ⅳ階段(11.3~4.3cal kyr BP),各因子作用波動明顯,Hg含量整體處于高值段;在第Ⅴ階段(4.3~3.1cal kyr BP)氣候轉(zhuǎn)干,大氣降塵也較低,Hg含量出現(xiàn)明顯的降低.第Ⅵ階段(3.1cal kyr BP以來)表現(xiàn)出大氣降塵的逐漸增加和整體減少的礦物質(zhì)輸入,反映降水減少以及逐漸增強(qiáng)的人類活動影響,Hg含量則持續(xù)升高.
[Abstract]:The Shennongjia Lake Basin since nine peat deposits in 16000 years were used to analyze the change of the content of Hg and its main influencing factors. Based on the profile of Ti, Al, Sc, Rb, Sr, Pb, Zn contents and 13C values, humification index, principal component analysis and stepwise regression analysis revealed the changes of Hg content of peat profile by atmospheric dust, surface runoff under the action of mineral inputs, atmospheric precipitation, peat decomposition degree factors. According to the effect of Hg content of each factor increases with the strength of the time (depth) change and the change of the content of Hg profile, 16000 years ago since the big nine Lake peat section Hg records can be divided into 6 stages. In stage I (16.0~15.6cal kyr BP), Hg content was lower due to the atmospheric dust reduction and peat decomposition degree decreased; the second stage (15.6~14.2cal kyr BP) precipitation increased and terrestrial biomass increased, terrigenous organic matter input increased, resulting in Hg Increased; stage III (14.2~11.3cal kyr BP) Younger Dryas (YD kyr BP, 12.3~11.3cal period), because of atmospheric dust increased, peat decomposition degree increased, the Hg content was increased before YD; phase IV (11.3~4.3cal kyr BP), the factor of obvious fluctuations in the overall Hg content in the high value period; stage V (4.3~3.1cal kyr BP) dry climate, atmospheric dust is low, the content of Hg obviously decreased. The sixth stage (3.1cal kyr BP) showed dustfall increased gradually and the overall reduction of mineral input, reflect the influence of human activities and precipitation decreased gradually, Hg content continued increased.

【作者單位】： 皖西學(xué)院環(huán)境與旅游學(xué)院;南京大學(xué)地理與海洋科學(xué)學(xué)院;滁州學(xué)院地理信息與旅游學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(41371202,40701190) 安徽省高校自然科學(xué)重點(diǎn)項(xiàng)目(KJ2011A274)
【分類號】：X142

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