抚仙湖悬浮颗粒物正构烷烃来源及季节特征

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Abstract In order to investigate the sources and spatiotemporal variation characteristics of n-alkanes in organic matter in Fuxian Lake, the distribution characteristics, biological sources and seasonal variations of suspended particulate matter in water columns of Fuxian Lake from April 2016 to March 2017 were studied. The vertical distribution of n-alkanes demonstrated the relative abundance of n-alkanes above the thermocline was higher than that below the thermocline. The maximum concentration of n-alkanes occured in ~20m depth. The relative abundance of n-alkanes in water columns was weakly affected by sediment resuspension. The obvious seasonal fluctuation in n-alkanes with the highest values in October and April can be found. Furthermore, the seasonal variation trends of n-25, n-27, n-29 alkanes were consistent with that of phytoplankton biomass, which illustrated that the phytoplankton was the main source of n-alkanes in water columns of Fuxian Lake. Water temperature was one of the key factors to limit the spatial and temporal distribution of n-alkanes in water columns of Fuxian Lake. All the input from the phytoplanktons, surface soil and submerged plants played an important role for the high abundance of C₂₉in the surface sediments. The n-alkanes (C₃₁ and C₂₃) in the sediments of Fuxian Lake could effectively indicate the input of terrestrial plants and submerged plants. The results were good foundation of paleo-environmental reconstruction in down core sediments based on n-alkanes in Fuxian Lake.

Key words： Fuxian Lake suspended particulate matter n-alkanes phytoplankton

Received: 02 November 2020

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X524

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	Articles by authors
	YUAN Hong-xiang
	SUN Hui-ling
	DUAN li-zeng
	ZHANG Hu-cai

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YUAN Hong-xiang,SUN Hui-ling,DUAN li-zeng等. The sources and seasonal variation characteristics of n-alkanes in suspended particulate matter in Fuxian Lake[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(6): 2812-2820.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I6/2812

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