Dating the period when intensive anthropogenic activity began to influence the Sanjiang Plain, Northeast China

Scientific Reports
Jinxin CongGuoping Wang

Abstract

Dating the start of intensive anthropogenic influence on ecosystems is important for identifying the conditions necessary for ecosystem recovery. However, few studies have focused on determining when anthropogenic influences on wetland began through sedimentary archives. To fill this critical gap in our knowledge, combustion sources and emission intensities, reconstructed via black carbon (BC) and polycyclic aromatic hydrocarbons (PAHs) were analyzed in two wetlands in the Sanjiang Plain in Northeast China. (14)C provided age control for the sedimentary records. By combining previous sedimentary and archaeological studies, we attempt to date the beginning of intensive anthropogenic influences on the Sanjiang Plain. Our results showed that BC deposition fluxes increased from 0.02 to 0.7 g C/m(2).yr during the last 10,000 years. An upward trend was apparent during the last 500 years. Before 1200 cal yr BP, human activities were minor, such that the wetland ecosystem in the Sanjiang Plain before this period may represent the reference conditions that for the recovery of these wetlands. As the human population increased after 1200 cal yr BP, combustion sources changed and residential areas became a major source of BC and PAHs. In t...Continue Reading

References

Sep 25, 2002·Environmental Science & Technology·Jianzhong SongWeilin Huang
Feb 5, 2009·Proceedings of the National Academy of Sciences of the United States of America·J R MarlonC Whitlock
Apr 16, 2010·Environmental Science & Technology·Jacopo GabrieliCarlo Barbante
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Nov 28, 2012·The Science of the Total Environment·Mohammed AllanNathalie Fagel
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