抚仙湖沉积物有机碳埋藏特征及来源解析

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Abstract

To investigate the burial and source characteristics of organic carbon in the sediments of Fuxian Lake over the past 100years, the sediment cores in the north and south of Fuxian Lake were taken as objects to analyze the temporal and spatial variation characteristics of organic carbon accumulation rates. The sources variation characteristics of organic carbon buried in sediments were analyzed by using n-alkanes and their distribution characteristics. The results showed that, in sediments the TOC contents ranged from 1.79 to 29.39mg/g, and OCAR ranged from 3.07 to 27.71g/(m²·a), both of which showed an overall upward trend since 1880 and the growth rates accelerated significantly since 1980. The organic carbon contents in the north(8.70mg/g) were less than those in the south(12.59mg/g), while the OCAR were higher in northern(13.54g/(m²·a) than southern(8.29g/(m²·a). It was related to source types of organic matter and the environmental changes caused by the increasing of human activities in Fuxian Lake basin. The carbon numbers of n-alkanes in the sediments ranged from C₁₂ to C₃₃, which were dominated by high carbon components with obvious odd and even advantages, and mainly composed of high carbon arrays, indicated that the organic matters in the sediments mainly came from higher plants. The Paq indicated that submerged plants predominated in aquatic plant. 2C₃₁/(C₂₇+C₂₉) and ACL_27~33 indicated that herbaceous plants and woody plants contributed equally to terrestrial higher plant. The contribution of aquatic plants in the northern lake was greater than that in the southern lake while the contribution of terrestrial higher plants in the southern lake was greater than that in the northern lake.

Key words： TOC organic carbon accumulation rates n-alkanes source analysis

Received: 01 August 2019

PACS:

X524

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	Articles by authors
	LAI Shan
	WAN Hong-bin
	TANG Fang
	YANG Hao
	HUANG Chang-chun
	ZHANG Zhi-gang
	HUANG Tao

Cite this article:

LAI Shan,WAN Hong-bin,TANG Fang等. Characteristics and source analysis of organic carbon buried in sediments of Fuxian Lake[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(3): 1246-1256.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I3/1246

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