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School of Geographic Sciences South China Normal University
Online First:07 September 2013,
Published:2013
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Zhong, W., Cao, J., Xue, J. et al. Variation in δ15N of a lacustrine sedimentary sequence in the Nanling Mountains and its potential implication for climatic conditions over the past ∼16 000 years., Chin. J. Ocean. Limnol. 31, 1098–1106 (2013). https://doi.org/10.1007/s00343-013-2266-0
Although extensive studies have been performed on nitrogen isotopes in lake sediments
understanding the complexity of the δ15N variation related to past environmental and climatic conditions still remains unclear. Supported by multi-proxy records including litho-units
organic carbon isotopes
ration of total organic carbon and total nitrogen
organic matter content
bulk dry density
the accumulation rate of organic matter
median grain size
magnetic susceptibility
and Rb/Sr and Ca/Mg ratios obtained from a sedimentary sequence in a small lake (i.e.
Dahu Swamp) in the eastern Nanling Mountains in South China
we deduce that variation in the δ15N values results primarily from the sources of organic matter
which are significantly influenced by climatic conditions over the past ∼16 000 years. A low (or high) lake level resulting from dry (or wet) conditions would lead to more (or fewer) vascular plant remains in the sediments and stronger (or weaker) denitrification associated with hypolimnetic anoxia
resulting in lower (or higher) δ15N values. In addition
dry (or wet) conditions would favor weakened (or strengthened) biogeochemical activity in the catchment
which could result in less (or more) external input of 15N-enriched OM
thus leading to decreased (or increased) δ15N values. Our results indicate that the lake sediment δ15N record in the Nanling Mountains has the potential to provide valuable insight into past East Asian monsoon climatedriven environmental changes.
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