喀斯特城市湖库pCO_(2)及CO_(2)通量空间格局研究  

Spatial patterns of partial pressure of carbon dioxide and its exchange flux in karst lakes and reservoirs in a metropolis

作　　者：李元媛 王志康 Irumva Olivier 马永梅 倪茂飞 吴云杰 LI Yuan-yuan;WANG Zhi-kang;Irumva Olivier;MA Yong-mei;NI Mao-fei;WU Yun-jie(College of Eco-Environmental Engineering,Guizhou Minzu University,Guiyang 550025,China;Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences,Chongqing 400714,China;Guizhou Provincial Engineering Geological Disaster Prevention and Control Engineering Research Center,Guizhou Minzu University,Guiyang 550025,China)

机构地区：[1]贵州民族大学生态环境工程学院,贵州贵阳5500252 [2]中国科学院重庆绿色智能技术研究院,重庆4007143 [3]贵州民族大学贵州省工程地质灾害防治工程研究中心,贵州贵阳550025

出　　处：《中国环境科学》2022年第12期5918-5927,共10页China Environmental Science

基　　金：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)。

摘　　要：为探索典型喀斯特城市湖库二氧化碳分压(pCO_(2))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pCO_(2)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pCO_(2)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(CO_(2))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/(m^(2)·d),具有向大气排放CO_(2)的潜力;SBS、BHH和HFH的F值分别为(-5.86±5.25)mmol/(m^(2)×d)、(-8.63±1.03)mmol/(m^(2)·d)和(-7.58±1.10)mmol/(m^(2)·d),表现为大气CO_(2)汇.湖库表层水体pCO_(2)与环境因子叶绿素a(Chla)和氨氮(NH_(4)^(+)-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CO_(2)量级.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 CO_(2)(pCO_(2))and CO_(2) 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 CO_(2) exchange.The higher pCO_(2) 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 CO_(2)(k values)varied between 2.05~3.82cm/h.The F values were respectively(6.23±9.59)mmol/(m^(2)·d),(-5.86±5.25)mmol/(m^(2)·d),(-8.63±1.03)mmol/(m^(2)·d)and(-7.58±1.10)mmol/(m^(2)·d)in the AHa,SBS,BHH and HFH,indicating that karst lakes and reservoirs served as both CO_(2) sink and source with respect to the overlying atmosphere.Aquatic pCO_(2) was tightly linked to chlorophyll a(Chla)and ammonia nitrogen(NH4+-N),suggesting that surface water CO_(2) levels responded to coupled carbonate dissolution with photosynthesis and regional human inputs in the karst waters.

关 键 词：喀斯特湖库 二氧化碳 交换通量 环境因子 空间格局 

分 类 号：X143[环境科学与工程—环境科学]