气候变化领域集成服务门户(CCPortal): 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

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DOI	10.1016/j.palaeo.2015.02.038
	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
	Zhao, Yan; Wu, Fuli; Fang, Xiaomin; Yang, Yibo
通讯作者	Wu, FL (通讯作者)
发表日期	2015
ISSN	0031-0182
EISSN	1872-616X
起始页码	1
结束页码	9
卷号	426
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. (C) 2015 Elsevier B.V. All rights reserved.
关键词	MICROBIAL BIOMASS PHOSPHORUS ELEVATED ATMOSPHERIC CO2 CARBON-ISOTOPE SOIL CARBON MATTER NITROGEN FOREST LAKE DYNAMICS SULFUR
英文关键词	C/N ratios; Organic matter sources; Topsoil; Paleo-environmental reconstruction; Qilian Mountains
语种	英语
WOS研究方向	Physical Geography ; Geology ; Paleontology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS记录号	WOS:000353603000001
来源期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258493
推荐引用方式 GB/T 7714	Zhao, Yan,Wu, Fuli,Fang, Xiaomin,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]. 中国科学院青藏高原研究所,2015,426.
APA	Zhao, Yan,Wu, Fuli,Fang, Xiaomin,&Yang, Yibo.(2015).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.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,426.
MLA	Zhao, Yan,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".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 426(2015).