夏季汾河干流溶解无机碳同位素组成及其来源

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Abstract Based on hydrographic and carbonate data collected from an investigation in the main stream of the Fenhe River in August 2019, the variations of dissolved inorganic carbon (DIC) and isotope value (δ¹³C_DIC) along the river as well as their possible factors were preliminarily discussed. The results showed that the DIC concentration was 2756μmol/kg and the δ¹³C_DIC value was -9.6‰ at the headstream, and CO₂ input from soil and carbonate chemical weathering may be the main sources. In the upstream reservoir-affected area of Taiyuan downtown, due to strong primary production both DIC (the average value was 2377μmol/kg) and partial pressure of CO₂ (pCO₂) (the average value was 552μatm) were lower, and δ¹³C_DIC (the average value was -5.2‰) was more positive compared to those at the headstream, whereas in the downstream dam stagnation affected area because of large amounts of municipal sewage inputs and degradation of organic matter both DIC (&ggt;4900μmol/kg) and pCO₂ (>5000μatm) increased substantially, and δ¹³C_DIC became more negative (<-10.3‰). In the lower reaches of the Fenhe River flowing through the main grain production areas, the δ¹³C_DIC value (~-8.0‰) was more positive than that at the headstream of the river, possibly related to the existence of C4 plants such as corn. Overall, human disturbance had become a very important factor affecting the DIC variations along the Fenhe River. Moreover, the dam stagnation affected area at the downstream of the city, which acts as a strong CO₂ source of the atmosphere, should be paid more attention in the future.

Key words： dissolved inorganic carbon (DIC) δ¹³C_DIC respiration primary production the Fenhe River

Received: 01 March 2020

PACS:	X131.2
	X522

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	LI Yun-xiao
	HUANG Xiao
	ZOU Ying-jie
	XUE Liang
	FAN Wen-hua
	WANG Gai-ling

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LI Yun-xiao,HUANG Xiao,ZOU Ying-jie等. Isotopic composition of dissolved inorganic carbon and its source in the main stream of the Fenhe River during summer[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(9): 3871-3878.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I9/3871

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