Effect of different wetness conditions on Sphagnum lipid composition in the Erxianyan peatland,central China |
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| Institution: | 1. Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Shengbei Street 4888, 130102 Changchun, China;2. ILÖK, Hydrology Group, University of Münster, Heisenbergstr. 2, 48149 Münster, Germany;3. College of Hydrometeorology, Nanjing University of Information Science & Technology, Nanjing 210044, Jiangsu Province, China;1. Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;2. Department of Land, Air and Water Resources, University of California, Davis, CA 95616, USA;1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China;2. Laboratory of Critical Zone Evolution, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China;3. Department of Earth and Environmental Sciences, The University of Michigan, Ann Arbor, MI 48109-1005, USA |
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| Abstract: | Samples of Sphagnum palustre and peat from the Erxianyan peatland, central China, were analyzed for lipids and their carbon isotopes to investigate how lipid distributions respond to hydrological change and to evaluate the importance of the contribution of microbial lipids to the peat moss. The lipids in samples collected from different hydrological settings in and around a pond and in the central part of the bog show clear variation along the hydrological gradient, with higher n-C23/n-C25 alkane ratio values and lower ACL (average chain length) values of long chain n-alkanes, n-fatty alcohols and n-fatty acids at the wetter sites. Although the relationship between the S. palustre lipids and the hydrological conditions can be partially overprinted in peat by an input from vascular plants, lipid ratios such as Paq and ACL can provide useful qualitative information about Sphagnum contributions. In addition, lipid composition and carbon isotope values provide information about microbial activity associated with S. palustre. The occurrence of a high abundance of 7-methylheptadecane in submerged S. palustre is an indication of cyanobacteria in the living peat moss. The relatively 13C-depleted carbon isotope values of the n-C23 alkane could result from the influence of symbiotic methanotrophs on the carbon available for assimilation by S. palustre. |
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