气候变化领域集成服务门户(CCPortal): Mathematical modeling of the aquatic macrophyte inputs of mid-chain n-alkyl lipids to lake sediments: Implications for interpreting compound specific hydrogen isotopic records

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DOI	10.1016/j.gca.2011.04.008
	Mathematical modeling of the aquatic macrophyte inputs of mid-chain n-alkyl lipids to lake sediments: Implications for interpreting compound specific hydrogen isotopic records
	Gao, Li; Hou, Juzhi; Toney, Jaime; MacDonald, Dana; Huang, Yongsong
通讯作者	Huang, Y (通讯作者)
发表日期	2011
ISSN	0016-7037
EISSN	1872-9533
起始页码	3781
结束页码	3791
卷号	75 期号:13
英文摘要	We present a systematic study of chain-length distributions and D/H ratios of n-alkyl lipids (both n-alkanes and n-alkanoic acids) in a wide range of terrestrial and aquatic plants around and in Blood Pond, Massachusetts, USA. The primary goal is to establish a model to quantitatively assess the aquatic plant inputs of the mid-chain length n-alkyl lipids to lake sediments and to determine the average hydrogen isotopic ratios of these lipids in different plants. Our results show that middle-chain n-alkyl lipids (C-21-C-23 n-alkanes and C-20-C-24 n-alkanoic acids) are exceptionally abundant in floating and submerged aquatic plants, in contrast to the dominance of long-chain n-alkyl lipids (C-27-C-31 n-alkanes and C-26-C-32 n-alkanoic acids) in other plant types, which are consistent with previously published data from Mountain Kenya and the Tibetan Plateau. Combining available data in different environmental settings allows us to establish statistically robust model distributions of n-alkyl lipids in floating/submerged macrophytes relative to other plant types. Based on the model distributions, we established a multi-source mixing model using a linear algebra approach, in order to quantify the aquatic inputs of mid-chain n-alkyl lipids in lake sediments. The results show that similar to 97% of the mid-chain n-alkyl lipids (C-23 n-alkane and C-22 n-acid (behenic acid)) in Blood Pond sediments are derived from floating and submerged macrophytes. In addition, D/H ratios of C-22 n-acid and C-23 n-alkane in the floating and submerged plants from Blood Pond display relatively narrow ranges of variation (-161 +/- 16 parts per thousand and -183 +/- 18 parts per thousand, respectively). Our study demonstrates that mid-chain n-alkyl lipids such as C-23 n-alkane and C-22 n-acid could be excellent recorders of past lake water isotopic ratios in lakes with abundant floating and submerged macrophyte inputs. (C) 2011 Elsevier Ltd. All rights reserved.
关键词	DELTA-D VALUES D/H RATIOS LEAF WAXES ENVIRONMENTAL WATER CLIMATE ALKANES PLANT VEGETATION PRECIPITATION TERRESTRIAL
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000293088600010
来源期刊	GEOCHIMICA ET COSMOCHIMICA ACTA
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/257866
推荐引用方式 GB/T 7714	Gao, Li,Hou, Juzhi,Toney, Jaime,et al. Mathematical modeling of the aquatic macrophyte inputs of mid-chain n-alkyl lipids to lake sediments: Implications for interpreting compound specific hydrogen isotopic records[J]. 中国科学院青藏高原研究所,2011,75(13).
APA	Gao, Li,Hou, Juzhi,Toney, Jaime,MacDonald, Dana,&Huang, Yongsong.(2011).Mathematical modeling of the aquatic macrophyte inputs of mid-chain n-alkyl lipids to lake sediments: Implications for interpreting compound specific hydrogen isotopic records.GEOCHIMICA ET COSMOCHIMICA ACTA,75(13).
MLA	Gao, Li,et al."Mathematical modeling of the aquatic macrophyte inputs of mid-chain n-alkyl lipids to lake sediments: Implications for interpreting compound specific hydrogen isotopic records".GEOCHIMICA ET COSMOCHIMICA ACTA 75.13(2011).