|
|
Long-term (16000yr) controls on mercury accumulation reconstructed using a peat record from Dajiuhu mire, central China |
LI Yuan-ping1,2, MA Chun-mei2, ZHU Cheng2, HUNG Run1, ZHENG Chao-gui3 |
1. School of Environment and Tourism, West Anhui University, Lu'an 237012, China;
2. School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210046, China;
3. School of Geography Information and Tourism, Chuzhou University, Chuzhou 239000, China |
|
|
Abstract In the present study, a peat core sampled in Dajiuhu montane mire, Hubei province, extending back to 16,000yr BP was analyzed for Hg accumulation and main environmental processes involved in the control of Hg concentrations. Based on Ti, Al, Sc, Rb, Sr, Pb and Zn contents as well as humification and δ13C of the core, principal component analysis (PCA) and stepwise regression analysis revealed that main processes controlling Hg concentrations included the mineral input by precipitation and runoff (PC1), dust deposition (PC2), wet deposition (PC3) and peat decomposition (PC4). On the basis of the relative importance of each factor on Hg concentrations, the 16,000yr record of the Dajiuhu peat core could be divided into six main phases. During phaseⅠ(16.0~15.6cal kyr BP), reduced regional dustfall and peat decomposition resulted in decreased Hg concentrations. In PhaseⅡ(15.6~14.2cal kyr BP) ,significantly increased atmospheric wet deposition and fluxes of particulate and dissolved terrestrial organic matter from soils under enhanced terrestrial productivity after the last glacial period were probably responsible for higher Hg concentrations. In phase Ⅲ(14.2~11.3cal kyr BP), Hg concentrations were enhanced later during the Younger Dryas(12.3~11.3cal kyr BP) by increased regional dustfall and peat decomposition. During phase Ⅳ(11.3~4.3cal kyr BP), although significant volatility of the four factors, Hg concentrations were higher as a whole. Lower Hg concentration in phase Ⅴ(4.3~3.1cal kyr BP) were mainly resulted from apparent decrease in atmospheric wet and dry deposition. In phase Ⅵ(3.1cal kyr BP to present), the Hg concentration increased with decreasing depth, albeit with evident volatility. This phase was characterized by reduced input of mineral matter into the mire and gradual increase in regional dustfall, indicating precipitation reduction and progressively increasing influence of anthropogenic activities on Hg accumulation in the peat.
|
Received: 08 August 2016
|
|
|
|
|
[1] |
Morel F M M, Kraepiel A M L, Amyot M. The chemical cycle and bioaccumulation of mercury [J]. Annual Review of Ecology Evolution and Systematics, 1998,29:54-566.
|
[2] |
Martínez-Cortizas A, Pontevedra-Pombal X, García-Rodeja E, et al. Mercury in a Spanish peat bog: archive of climate change and atmospheric metal deposition [J]. Science, 1999,284:939-942.
|
[3] |
Biester H, Kilian R, Franzen C, et al. Elevated mercury accumulation in a peat bog of the Magellanic Moorlands, Chile (53°S)—an anthropogenic signal from the Southern Hemisphere [J]. Earth and Planetary Science Letters, 2002,201:609-620.
|
[4] |
Franzen C, Kilian R, Biester H. Natural mercury enrichment in a minerogenic fen — evaluation of sources and processes [J]. Journal of Environmental Monitoring, 2004,6:466-472.
|
[5] |
Farmer J G, Anderson P, Cloy J M, et al. Historical accumulation rates of mercury in four Scottish ombrotrophic peat bogs over the past 2000years [J]. Science of the Total Environment, 2009,407: 5578-5588.
|
[6] |
Tang S L, Huang Z W, Liu J, et al. Atmospheric mercury deposition recorded in an ombrotrophic peat core from Xiaoxing'an Mountain, Northeast China [J]. Environmental Research, 2012,118:145-148.
|
[7] |
Pérez-Rodríguez M, Horák-Terra I, Rodríguez-Lado L, et al. Long-term (~57ka) controls on mercury accumulation in the Souther Hemisphere reconstructed using a peat record from Pinheiro mire (Minas Gerais, Brazil) [J]. Environmental Science & Technology, 2015,49:1356-1364.
|
[8] |
Vandal G M, Fitzgerald W F, Boutron C F, et al. Variations in mercury deposition to Antarctica over the past 34,000years [J]. Nature, 1993,362:621-623.
|
[9] |
Jitaru P, Gabrielli P, Marteel A, et al. Atmospheric depletion of mercury over Antarctica during glacial periods [J]. Nature Geoscience, 2009,2:505-508.
|
[10] |
Zheng J C, Pelchat P, Vaive J, et al. Total mercury in snow and ice samples from Canadian High Arctic ice caps and glaciers: A practical procedure and method for total Hg quantification at low pg g-1level [J]. Science of the Total Environment, 2014,468-469: 487-494.
|
[11] |
Yang H D, Battarbee R W, Turner S D, et al. Historical reconstruction of mercury pollution across the Tibetan Plateau using lake sediments [J]. Environmental Science & Technology, 2010,44:2918-2924.
|
[12] |
Conaway C H, Swarzenski P W, Cohen A S. Recent paleorecords document rising mercury contamination in Lake Tanganyika [J]. Applied Geochemistry, 2012,27:352-359.
|
[13] |
Hermanns Y M, Biester H. Anthropogenic mercury signals in lake sediments from southernmost Patagonia, Chile [J]. Environmental Science & Technology, 2013,445:126-135.
|
[14] |
Hermanns Y M, Biester H. A 17,300-year record of mercury accumulation in a pristine lake in southern Chile [J]. Journal of Paleolimnology, 2013,49:547-561.
|
[15] |
侍文芳,冯新斌,张 干,等.150年以来红原雨养型泥炭中高分辨的汞同位素沉积记录 [J]. 科学通报, 2011,56(8):583-588.
|
[16] |
余 骏,张学胜,李玉成,等.巢湖杭埠—丰乐河汞的污染特征及生态风险 [J]. 中国环境科学, 2016,36(8):2487-2494.
|
[17] |
任家盈,姜 霞,陈春霄,等.太湖营养状态对沉积物中总汞和甲基汞分布特征的影响 [J]. 中国环境科学, 2013,33(7):1290-1297.
|
[18] |
Li Y P, Ma C M, Zhu C, et al. Historical anthropogenic contributions to mercury accumulation recorded by a peat core from Dajiuhu montane mire, central China [J]. Environmental Pollution, 2016,216:332-339.
|
[19] |
Biester H, Martinez-Cortizas A, Birkenstock S, et al. Effect of peat decomposition and mass loss on historic mercury records in peat bogs from Patagonia [J]. Environmental Science & Technology, 2003,37:32-39.
|
[20] |
Roos-Barraclough F, Martínez-Cortizas A, García-Rodeja E, et al. A 14500year record of the accumulation of atmospheric mercury in peat: volcanic signals, anthropogenic influences and a correlation to bromine accumulation [J]. Earth and Planetary Science Letters, 2002,202:435-451.
|
[21] |
Li J, Zheng Z, Huang K Y, et al. Vegetation changes during the past 40 000years in Central China from a long fossil record [J]. Quaternary International, 2013,310:221-226.
|
[22] |
郑秋凤,张茂恒,李吉均,等.大九湖钻孔记录的神农架地区中更新世晚期以来的气候环境变化 [J]. 地理研究, 2014,33(6): 1167-1177.
|
[23] |
Zhu C, Ma C M, Yu S Y, et al. A detailed pollen record of vegetation and climate changes in Central China during the past 16 000years [J]. Boreas, 2010,39:69-76.
|
[24] |
朱 诚,马春梅,张文卿,等.神农架大九湖15,753yr BP以来的孢粉记录和环境演变 [J]. 第四纪研究, 2006,26(5):814-826.
|
[25] |
马春梅,朱 诚,郑朝贵,等.晚冰期以来神农架大九湖泥炭高分辨率气候变化的地球化学记录研究 [J]. 科学通报, 2008,53(增刊Ⅰ):26-37.
|
[26] |
马春梅,朱 诚,郑朝贵,等.中国东部山地泥炭高分辨率腐殖化度记录的晚冰期以来气候变化 [J]. 中国科学(D辑), 2008, 38(9):1078-1091.
|
[27] |
Li Y P, Ma C M, Zhou B, et al. Environmental processes derived from peatland geochemistry since the last deglaciation in Dajiuhu, Shennongjia, central China [J]. Boreas, 2016,45:423-438.
|
[28] |
朱 诚,陈 星,马春梅,等.神农架大九湖孢粉气候因子转换函数与古气候重建 [J]. 科学通报, 2008,53(增刊Ⅰ):38-44.
|
[29] |
Huang X Y, Meyers P A, Jia C L, et al. Paleotemperature variability in central China during the last 13ka recorded by a novel microbial lipid proxy in the Dajiuhu peat deposit [J]. Holocene, 213,23(8):1123-1129.
|
[30] |
Zhao Y, Hölzer A, Yu Z C. Late Holocene natural and human-induced environmental change reconstructed from peat records in eastern central China [J]. Radiocarbon, 2007,49:789-798.
|
[31] |
朱 芸,陈 晔,赵志军,等.神农架大九湖泥炭藓泥炭α-纤维素δ13C记录的1000~4000a BP间环境变化 [J]. 科学通报, 2009, 54(20):3108-3116.
|
[32] |
Gallego J L R, Ortiz J E, Sierra C, et al. Multivariate study of trace element distribution in the geological record of Rońanzas Peat Bog (Asturias, N. Spain). Paleoenvironmental evolution and human activities over the last 8000cal yr BP [J]. Science of the Total Environment, 2013,454-455:6-29.
|
[33] |
Margalef O, Martínez-Cortizas A, Kylander, M, et al. Environmental processes in Rano Aroi (Easter Island) peat geochemistry forced by climate variability during the last 70kyr [J]. Palaeogeography, Palaeoclimatology, Palaeoecology, 2014, 414:438-450.
|
[34] |
Hansson S V, Rydberg J, Kylander M. Evaluating paleoproxies for peat decomposition and their relationship to peat geochemistry [J]. Holocene, 2013,23(12):1666-1671.
|
[35] |
Mayr C, Lücke A, Maidana N I, et al. Isotopic fingerprints on lacustrine organic matter from Laguna Potrok Aike (southern Patagonia, Argentina) reflect environmental changes during the last 16,000years [J]. Journal of Paleolimnology, 2009,42:81-102.
|
[36] |
Zhong W, Xue J B, Zheng Y M, et al. Climatic changes since the last deglaciation inferred from a lacustrine sedimentary sequence in the eastern Nanling Mountains, south China [J]. Journal of Quaternary Science, 2010,25(6):975-984.
|
[37] |
Blackford J J, Chambers F M. Determining the degree of peat decomposition for peat based palaeoclimatic studies [J]. International Peat Journal, 1993,5:7-24.
|
[38] |
Martínez-Cortizas A, Biester H, Mighall T, et al. Climate-driven enrichment of pollutants in peatlands [J]. Biogeosciences, 2007, 4:905-911.
|
[39] |
Biester H, Martínez-Cortizas A, Birkenstock S, et al. Effect of peat decomposition and mass loss on historic mercury records in peat bogs from Patagonia [J]. Environmental Science & Technology, 2003,37:32-39.
|
[40] |
Dong J G, Wang Y J, Cheng H, et al. A high-resolution stalagmite record of the Holocene East Asian monsoon from Mt. Shennongjia, central China [J]. Holocene, 2010,20:257-264.
|
|
|
|