TY - JOUR
T1 - Predominance of terrestrial organic matter in sediments from a cyanobacteria- blooming hypereutrophic lake
AU - Xu, Xiaoguang
AU - Li, Wei
AU - Fujibayashi, Megumu
AU - Nomura, Munehiro
AU - Nishimura, Osamu
AU - Li, Xianning
N1 - Funding Information:
We would like to thank Hailiang Song, Xiaoli Yang, and other teachers of Southeast University (China) for their assistance in the field. We are grateful to the staff of YiXing Environmental Monitoring Station (China) for their help with the freeze-dry aspect of this work and Drs. Webeck Liz, Junwei Zhang, and Wensong Duan for reviewing the manuscript. This research was supported by Tohoku University Ecosystem Adaptability Global Centers of Excellence (GCOE) awarded by Japan’s Ministry of Education, Culture, Sports, Science and Technology (J03), and the Environmental Research and Technology Development Fund of the Ministry of Environment, Japan (B-1004).
Publisher Copyright:
© 2014 Elsevier Ltd. All rights reserved.
PY - 2015/3
Y1 - 2015/3
N2 - Although an understanding of the quantity and quality of sedimentary organic matter (SOM) pools is necessary to design sound environmental management strategies for lacustrine systems, the characterization of organic matter sources and the assessment of their relative contributions to eutrophic and inland lake sediments remain insufficient. In this study, the contribution of potential organic matter sources to sediments in shallow and hypereutrophic lake Taihu, China was assessed on the molecular level using source-specific fatty acid biomarkers. The results indicated that SOM was composed mainly of terrestrial plants with a maximal contribution of 45.3 ± 2.4% to the total organic carbon, which accounted for approximately 66% among the determined organic matter sources. Evidence suggests the terrestrial plants remained in a fresh state in surface sediments: the correlation (R2 = 0.62, p < 0.05) between bacterial and terrestrial plant carbon was strong. On the other hand, aquatic plant and bacterial carbon contributed 5-15% to the total organic carbon, which was followed by the faint contribution (<5% of total organic carbon) of algae-derived organic carbon including cyanobacteria, diatoms, and dinoflagellates. The results provided details of the contributions of SOM sources, illustrating the usefulness of fatty acid biomarkers in discriminating organic matter sources within lake environments. Although organic matter sources of sediments varied in spatial and temporal patterns, the strong correlation between terrestrial plant and total organic carbon (R2 = 0.60, p < 0.05) indicates that terrestrial plants were the dominant source in lake sediments.
AB - Although an understanding of the quantity and quality of sedimentary organic matter (SOM) pools is necessary to design sound environmental management strategies for lacustrine systems, the characterization of organic matter sources and the assessment of their relative contributions to eutrophic and inland lake sediments remain insufficient. In this study, the contribution of potential organic matter sources to sediments in shallow and hypereutrophic lake Taihu, China was assessed on the molecular level using source-specific fatty acid biomarkers. The results indicated that SOM was composed mainly of terrestrial plants with a maximal contribution of 45.3 ± 2.4% to the total organic carbon, which accounted for approximately 66% among the determined organic matter sources. Evidence suggests the terrestrial plants remained in a fresh state in surface sediments: the correlation (R2 = 0.62, p < 0.05) between bacterial and terrestrial plant carbon was strong. On the other hand, aquatic plant and bacterial carbon contributed 5-15% to the total organic carbon, which was followed by the faint contribution (<5% of total organic carbon) of algae-derived organic carbon including cyanobacteria, diatoms, and dinoflagellates. The results provided details of the contributions of SOM sources, illustrating the usefulness of fatty acid biomarkers in discriminating organic matter sources within lake environments. Although organic matter sources of sediments varied in spatial and temporal patterns, the strong correlation between terrestrial plant and total organic carbon (R2 = 0.60, p < 0.05) indicates that terrestrial plants were the dominant source in lake sediments.
KW - Fatty acid biomarker
KW - Hypereutrophic
KW - Lake Taihu
KW - Organic matter
KW - Source identification
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U2 - 10.1016/j.ecolind.2014.10.020
DO - 10.1016/j.ecolind.2014.10.020
M3 - Article
AN - SCOPUS:84910683784
VL - 50
SP - 35
EP - 43
JO - Ecological Indicators
JF - Ecological Indicators
SN - 1470-160X
ER -