喀斯特城市湖库pCO2及CO2通量空间格局研究

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Abstract The typical karst lakes and reservoirs including AHa Reservoir (AHa), Songbaishan Reservoir (SBS), Baihua Lake (BHH) and Hongfeng Lake were investigated regarding spatial patterns of partial pressure of CO₂ (pCO₂) and CO₂ exchange flux (F) in this study. We examined in-situ hydrometeorologic parameters, carbonate equilibria and environmental factors, as well as their potential constraints on water-air CO₂ exchange. The higher pCO₂ levels were observed in the AHa (861.6±462.8) μatm in comparison to the SBS (223.6±213.1) μatm, BHH (139.3±63.6) μatm and HFH (126.2±50.9) μatm (P<0.05). Gas transfer velocity of CO₂ (k values) varied between 2.05~3.82cm/h. The F values were respectively (6.23±9.59) mmol/(m²·d), (-5.86±5.25) mmol/(m²·d), (-8.63±1.03) mmol/(m²·d) and (-7.58±1.10) mmol/(m²·d) in the AHa, SBS, BHH and HFH, indicating that karst lakes and reservoirs served as both CO₂ sink and source with respect to the overlying atmosphere. Aquatic pCO₂ was tightly linked to chlorophyll a (Chla) and ammonia nitrogen (NH₄⁺-N), suggesting that surface water CO₂ levels responded to coupled carbonate dissolution with photosynthesis and regional human inputs in the karst waters.

Key words： karst lakes and reservoirs carbon dioxide exchange flux environmental factors spatial pattern

Received: 13 May 2022

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X143

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	LI Yuan-yuan
	WANG Zhi-kang
	Irumva Olivier
	MA Yong-mei
	NI Mao-fei
	WU Yun-jie

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LI Yuan-yuan,WANG Zhi-kang,Irumva Olivier等. Spatial patterns of partial pressure of carbon dioxide and its exchange flux in karst lakes and reservoirs in a metropolis[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(12): 5918-5927.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I12/5918

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