喀斯特城市湖库pCO2及CO2通量空间格局研究

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摘要为探索典型喀斯特城市湖库二氧化碳分压（pCO₂）及其交换通量（F）空间格局，以我国贵阳市阿哈湖水库（AHa）、松柏山水库（SBS）、百花湖（BHH）和红枫湖（HFH）为对象，探索了区域气象水文基础数据、碳酸盐平衡参数及环境因子，进而评估表层水体pCO₂及其F空间变化.结果表明，受原位新陈代谢和水文调节，AHa的pCO₂为（861.6±462.8）μatm，显著高于SBS （223.6±213.1）μatm、BHH （139.3±63.6）μatm和HFH （126.2±50.9）μatm （P<0.05），且各湖库水-气界面二氧化碳（CO₂）交换速率（k值）在（2.05~3.82） cm/h范围内.AHa的F值为（6.23±9.59） mmol/（m²·d），具有向大气排放CO₂的潜力；SBS、BHH和HFH的F值分别为（-5.86±5.25） mmol/（m²×d）、（-8.63±1.03） mmol/（m²·d）和（-7.58±1.10） mmol/（m²·d），表现为大气CO₂汇.湖库表层水体pCO₂与环境因子叶绿素a （Chla）和氨氮（NH₄⁺-N）具有显著相关性（P<0.05），说明喀斯特湖库碳酸盐耦合光合作用和人为输入极大影响了水体CO₂量级.

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	李元媛
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	吴云杰

关键词 ：喀斯特湖库, 二氧化碳, 交换通量, 环境因子, 空间格局

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

收稿日期: 2022-05-13

PACS:

X143

基金资助:国家自然科学基金资助项目（42107091，41867048，41803022）；贵州省科技计划项目（黔科合ZK[2021]219，ZK[2021]099）；贵州省普通高等学校青年科技人才成长项目（黔教合KY字[2021]109）

通讯作者: 倪茂飞,副教授,nimaofei000@163.com E-mail: nimaofei000@163.com

作者简介: 李元媛(1999-),女,贵州锦屏人,贵州民族大学生态环境工程学院本科生,研究方向为内陆水体碳循环.发表论文1篇.

引用本文:

李元媛, 王志康, Irumva Olivier, 马永梅, 倪茂飞, 吴云杰. 喀斯特城市湖库pCO₂及CO₂通量空间格局研究[J]. 中国环境科学, 2022, 42(12): 5918-5927. LI Yuan-yuan, WANG Zhi-kang, Irumva Olivier, MA Yong-mei, NI Mao-fei, WU Yun-jie. Spatial patterns of partial pressure of carbon dioxide and its exchange flux in karst lakes and reservoirs in a metropolis. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(12): 5918-5927.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2022/V42/I12/5918

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