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DOI: 10.1016/j.palaeo.2015.02.038
论文题名:
Topsoil C/N ratios in the Qilian Mountains area: Implications for the use of subaqueous sediment C/N ratios in paleo-environmental reconstructions to indicate organic sources
作者: Zhao Y.; Wu F.; Fang X.; Yang Y.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 426
起始页码: 1
结束页码: 9
语种: 英语
英文关键词: C/N ratios ; Organic matter sources ; Paleo-environmental reconstruction ; Qilian Mountains ; Topsoil
英文摘要: Sediment carbon/nitrogen (C/N) ratios can play an important role in reconstructing lacustrine and coastal paleo-environments, because significantly different C/N ratios result from aquatic phytoplankton versus organic matter derived from terrestrial plants. However, researchers have not yet taken into account the fact that topsoil organic matter is another important terrestrial organic source for lacustrine and coastal sediments. A study of topsoil C/N ratios from the Heihe and Shiyang River drainage basins, located in the Qilian Mountains on the northeast margins of the Tibetan Plateau, shows that topsoil C/N ratios can be as low as those of subaqueous sediments. 80.4% of total topsoils in the Heihe River drainage basin, and 67.7% of total topsoils in the Shiyang River drainage basin, have C/N ratios below 12, while 18.8% of all samples in the Heihe river drainage basin, and 29.2% of all samples in the Shiyang river drainage basin, possess C/N ratios between 12 and 20. Traditionally, researchers have considered that low C/N ratios indicate subaqueous deposition; however, these sediments are terrestrial and most of the organic matter is derived from land plants. Furthermore, topsoil C/N ratios from both the Heihe and Shiyang river drainage basins correlate significantly with altitude and local vegetation. Our results indicate that not all C/N ratios of terrestrial organic matter (including plants and soil organic matter) equal 20 or more. Nor can one distinguish subaqueous sediment organic sources solely on the basis of C/N ratios; low subaqueous sediment C/N ratios may not simply result from a greater proportion of aquatic plants versus terrestrial organic matter, but also from low end-member terrestrial organic matter C/N ratios which are lowered by the addition of soil organic matter with its own low C/N ratios. © 2015 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68964
Appears in Collections:过去全球变化的重建

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作者单位: Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, China; University of Chinese Academy of Sciences, Beijing, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, China; Key Laboratory of Western China's Environmental Systems, Ministry of Education of China, Lanzhou, China

Recommended Citation:
Zhao Y.,Wu F.,Fang X.,et al. Topsoil C/N ratios in the Qilian Mountains area: Implications for the use of subaqueous sediment C/N ratios in paleo-environmental reconstructions to indicate organic sources[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,426
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