Variations of Tree-ring Mercury Concentration and Its Response to Climate on the Southern Slope of Altay Mountains from 1821 to 2014
In this study,we established Larix Sibirica tree-ring mercury concentration record(1821-2014)of Qinghe region in the southern slope of Altay Mountains,analyzed the influence of climate on tree-ring mercury concentration,and discussed the causes of the mercury concentration changes from the global and regional perspectives.Results showed that the average tree-ring mercury concentration was 1.36 ng·g-1±0.28 ng·g-1 form 1821-2014.Correlation analysis showed that the tree-ring mercury concentration was positively correlated with the annual mean minimum temperature(r=0.268,P<0.05,n=57)and the annual mean water vapor pressure(r=0.326,P<0.05,n=57),and negatively correlated with the annual average 2-minute wind speed(r=-0.356,P<0.01,n=57),indicating that climate may affect the accumulation of mercury in tree rings.The tree-ring mercury concentration increased and displayed two peaks from the 1820s to the 1980s,where the first peak occurred across the 1850s and the middle and late 1860s,and the second occurred across the middle and late 1980s.A relative stable trend was observed between the 1990s and the early 2000s.After the middle and late 2000s,the concentration gradually decreased,which may be related to the implementation of air pollution control regulations in many countries.
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