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.
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)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
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)。
关键词
喀斯特湖库
二氧化碳
交换通量
环境因子
空间格局
karst lakes and reservoirs
carbon dioxide
exchange flux
environmental factors
spatial pattern
