喀斯特富营养湖泊水体碳浓度及储量变化特征——以异龙湖为例  

Characteristics of carbon concentration and storage in water body of the eutrophic karst lake:A case study from Yilong Lake

作　　者：王旭 温雯雯[1] 郭雯 李平 王明果 黄林培[1] 王露 杨关绍 陈光杰[1] WANG Xu;WEN Wenwen;GUO Wen;LI Ping;WANG Mingguo;HUANG Linpei;WANG Lu;YANG Guanshao;CHEN Guangjie(Yunnan Key Laboratory of Plateau Geographical Processes and Environmental Changes,Faculty of Geography,Yunnan Normal University,Kunming 650500,China;Meteorological Bureau of Fengning Manchu Autonomous County,Chengde 068350,Hebei,China;School of Resources and Environment,Xichang College,Xichang 615013,Sichuan,China;Yunnan Geological Mine Mapping Academy Co.,Ltd,Kunming 650217,China)

机构地区：[1]云南师范大学地理学部,云南省高原地理过程与环境变化重点实验室,昆明650500 [2]河北省丰宁满族自治县气象局,承德068350 [3]西昌学院资源与环境学院,西昌615013 [4]云南省地矿测绘院有限公司,昆明650217

出　　处：《地理研究》2024年第5期1316-1333,共18页Geographical Research

基　　金：国家自然科学基金项目(42067064、42171072);云南省重点研发计划项目(202203AC100002-02);云南省野外科学观测研究站项目(202305AM070002);云南省院士专家工作站项目(2017IC063)。

摘　　要：为探究喀斯特富营养湖泊水体不同赋存形式碳浓度和碳储量动态变化模式及其影响因素,本研究于2021年9月—2022年6月对异龙湖开展4个季节、20个点位的水质和水体碳浓度时空分布特征研究。结果发现,异龙湖水体碳以溶解碳占主导,溶解无机碳(DIC)浓度在4种赋存形式碳中最高为(41.26±4.93)mg/L,溶解有机碳(DOC)次之为(16.23±2.23)mg/L,颗粒碳浓度相对较低,颗粒有机碳(POC)和颗粒无机碳(PIC)浓度分别为(10.05±1.81)mg/L和(0.82±0.56)mg/L。异龙湖全年水体碳储量平均值为5.30 Gg C,4种赋存形式碳储量占比分别为60.57%(DIC)、23.77%(DOC)、14.53%(POC)和1.13%(PIC)。分析表明,异龙湖DOC、POC浓度与营养盐负荷及藻类生物量有关,指示其主要来源于藻源性有机碳。DIC浓度与DOC、水温、氨氮、入湖河流分布等因素相关,表明DIC受矿化作用、水温及流域水体稀释作用的共同驱动。PIC浓度与叶绿素a浓度和酸碱度有关,指示其主要受藻类光合作用导致的酸碱平衡破坏影响。异龙湖不同赋存形式碳浓度间存在一定的耦合关系,反映了不同赋存形式水体碳存在迁移和转化,湖泊富营养化导致藻类生物量增加,造成有机碳浓度POC和DOC同步升高,同时有机质的矿化作用也引起无机碳与有机碳的协同变化。与其他湖泊相比,异龙湖具有更高的水体碳浓度水平,可能与异龙湖的富营养化、喀斯特地质背景以及特殊的地理位置等因素有关。在碳储量上,水量是影响湖泊水体碳储量的关键因素,而富营养化提高了水体碳浓度和碳累积速率,增强了湖泊的碳汇效应,在全球湖泊富营养化问题日趋严峻的背景下,湖泊水体碳储量在生态系统碳汇估算中的地位逐渐显露。To investigate the dynamic changes of carbon concentration and storage in the water body of karst eutrophic lake and their influencing factors,a study was conducted on the spatiotemporal distribution characteristics of water quality and carbon concentration in Yilong Lake from September 2021 to June 2022.The results showed that dissolved carbon dominated the carbon content in the water body of Yilong Lake,with the highest concentration of dissolved inorganic carbon(DIC,(41.26±4.93)mg/L)among the four forms of carbon,followed by dissolved organic carbon(DOC,(16.23±2.23)mg/L).The concentration of particulate carbon was relatively low,with concentrations of particulate organic carbon(POC)and particulate inorganic carbon(PIC)being(10.05±1.81)mg/L and(0.82±0.56)mg/L,respectively.The average annual water carbon storage of Yilong Lake was 5.30 Gg C.The carbon storage of four types accounts for 60.57%(DIC),23.77%(DOC),14.53%(POC)and 1.13%(PIC),respectively.Analysis showed that the concentrations of DOC and POC in Yilong Lake were related to nutrient loading and algae biomass,indicating that they mainly come from algal derived organic carbon.The concentration of DIC was related to DOC,water temperature,ammonia nitrogen and distribution of rivers entering the lake,suggesting that DIC is jointly driven by mineralization,water temperature and dilution of watershed water.PIC was related to chlorophyll-a concentration and pH,indicating that it is mainly affected by the disruption of the acid-base balance caused by algal photosynthesis.Coupling relationship was found among four carbon forms,reflecting the migration and transformation of different carbon forms.Lake eutrophication led to an augmented algal biomass,resulting in concurrently elevated organic carbon levels of POC and DOC.At the same time,the mineralisation of organic matter also caused a synergistic change in inorganic and organic carbon.Compared with other lakes,Yilong Lake exhibited a higher carbon concentration,which may be attributed to factors such as eutro

关 键 词：水体碳浓度 水体碳储量 喀斯特地区 富营养化 异龙湖 

分 类 号：X524[环境科学与工程—环境工程]