Predominance of terrestrial organic matter in sediments from a cyanobacteria- blooming hypereutrophic lake

Xiaoguang Xu, Wei Li, Megumu Fujibayashi, Munehiro Nomura, Osamu Nishimura, Xianning Li

研究成果: Contribution to journalArticle査読

28 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)35-43
ページ数9
ジャーナルEcological Indicators
50
DOI
出版ステータス出版済み - 3 2015
外部発表はい

All Science Journal Classification (ASJC) codes

  • 決定科学(全般)
  • 生態、進化、行動および分類学
  • 生態学

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