Molecular level analysis of long term vegetative shifts and relationships to soil organic matter composition |
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| Affiliation: | 1. Department of Physical & Environmental Sciences, University of Toronto, 1265 Military Trail, Toronto, ON M1C 1A4, Canada;2. Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO 80523, USA;3. Department of Biology, Bradley University, Peoria, IL 61625, USA;1. College of Resources and Environmental Sciences, China Agriculture University, No. 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, PR China;2. Institute of Nuclear Technology and Biotechnology, Xinjiang Academy of Agricultural Science, No.403 Nanchang Road, Urumqi, Xinjiang 830091, PR China;3. Soil Biology and Plant Nutrition, University of Kassel, Nordbahnhofstr. 1a, Witzenhausen 37213, Germany;1. Department of Applied Environmental Science, Stockholm University, Sweden;2. Bolin Centre for Climate Research, Stockholm University, Sweden;3. International Arctic Research Center, University Alaska Fairbanks, Fairbanks, AK, USA;4. Pacific Oceanological Institute, Russian Academy of Sciences, Vladivostok, Russia;5. Department of Physical Geography and Quaternary Geology, Stockholm University, Sweden;1. College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, PR China;2. Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081, PR China;3. State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110164, PR China;4. DOE Great Lakes Bioenergy Research Center, University of Wisconsin, Madison 53706, USA;5. College of Geographical Science, Harbin Normal University, Harbin 150025, PR China;1. Marine Science Program, Department of Chemistry & Biochemistry, Florida International University, 3000 NE 151st St., North Miami, FL 33181, USA;2. Southeast Environmental Research Center, Florida International University, Miami, FL 33199, USA;3. Department of Chemistry and Biochemistry, University of North Carolina Wilmington, Wilmington, NC 28403, USA |
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| Abstract: | Soil organic matter (SOM) is one of the earth’s largest reservoirs of actively cycled carbon and plays a critical role in various ecosystem functions. In this study, mineral soils with the same parent material and of similar approximate age were sampled from the same climatic region in Halsey, Nebraska to determine the relationship between overlying vegetation inputs to SOM composition using complementary molecular level methods (biomarker analyses and solid state 13C nuclear magnetic resonance (NMR) spectroscopy). Soil samples were collected from a native prairie and cedar and pine sites planted on the native prairie. Free and bound lipids isolated from the pine soil were more enriched in aliphatic and cutin-derived compounds than the other two soils. Cinnamyl type lignin-derived phenols were more abundant in the grassland soil than in the pine and cedar soils. Acid to aldehyde ratios (Ad/Al) for vanillyl and syringyl type phenols were higher for the pine soil indicating a more advanced stage of lignin oxidation (also observed by 13C NMR) in the soil that has also been reported to have accelerated carbon loss. In agreement with the more abundant aliphatic lipids and cutin-derived compounds, solid state 13C NMR results also indicated that the SOM of the pine soil may have received more aliphatic carbon inputs or may have lost other components during enhanced decomposition. The observed relationship between vegetation and SOM composition may have important implications for global carbon cycling as some structures (e.g. aliphatics) are hypothesized to be more recalcitrant compared to others and their accumulation in soils may enhance below ground carbon storage. |
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