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- W1976306723 abstract "Lipid biomarker and organic carbon isotope were presented for identifying the microbial characteristics and paleovegetation changes of Tianmushan area, Zhejiang Province, China, since the Middle Holocene. Our results showed that organic carbon isotopic values (δ13Corg) ranged from −26.51‰ to −30.44‰, with an average value of −28.49‰, evidently indicating the predominance of C3 plants in this area since the formation of peat. The results from lipid biomarkers denoted a mixed organic contribution from lower and higher plants. The small molecules dominated by C17 were mainly from algae and bacteria, whereas the heavy-molecular-weight homologues (> C21) were chiefly from higher plants. Lipid analysis of peat profile revealed the carbon number distributions of n-alkanes, varying from C15 to C33, having a distinct odd-over-even predominance and a unimodal distribution in partial samples peaking primarily at C29 in the woodlands. The paleovegetation changes in relation to relative organic contribution can hereby be clearly detected by combining variations of C27, C29 and C31. We also found that the contribution of organic matter was largely from the higher plants below 68 cm. In relatively deeper part of the peat profile, more inputs were probably from the algae and bacteria, whereas the organic compositions were primarily from high vegetation and largely reduced contribution from algae and bacteria in the upper peat section. Combined analysis of biomarker and organic carbon isotope signature consequently revealed three remarkable paleoenvironmental stages, including the early stable era between 4100 and 3200 a B.P., the middle changeable period from 3200 to 700 a B.P., and a relatively warm stage since 700 a B.P. In addition, our results were well in line with the pertinent research results in the study area, thereby complementing molecular data in paleoclimate studies and providing a useful basis for comparing global changes." @default.
- W1976306723 created "2016-06-24" @default.
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- W1976306723 date "2008-07-01" @default.
- W1976306723 modified "2023-10-13" @default.
- W1976306723 title "Microbial Characteristics and Vegetation Changes as Recorded in Lipid Biomarker of Tianmushan Peat Bog" @default.
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- W1976306723 doi "https://doi.org/10.1016/s1872-5791(08)60050-0" @default.
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