中文关键词喀斯特河流二氧化碳排放营养元素耦合关系碳循环 英文关键词karst riverscarbon dioxide emissionsnutrientsenvironmental couplingcarbon cycle

作者	单位	E-mail
刘睿	重庆师范大学地理与旅游学院, 重庆 401331 重庆师范大学重庆市地理信息系统应用研究重庆市高校重点实验室, 重庆 401331	liur@cqnu.edu.cn
张静	重庆师范大学地理与旅游学院, 重庆 401331
陈祖胜	贵州民族大学生态环境工程学院, 贵阳 550025
倪茂飞	贵州民族大学生态环境工程学院, 贵阳 550025	nimaofei000@163.com
刘文胜	毕节市环境监测中心站, 毕节 551700

中文摘要 为探索喀斯特河流水-气界面二氧化碳（CO₂）交换特性及其营养控制因素，以我国典型喀斯特河流——芙蓉江为研究对象，探索了区域气象水文参数、碳酸盐平衡参数、营养元素及总有机碳（TOC）的空间变化特征，同时分析了CO₂分压（pCO₂）的空间变化调控因素，pCO₂与总氮（TN）、总磷（TP）和TOC及其化学计量比的耦合关系，对比了该研究河流与世界河流的CO₂排放情况.结果表明，芙蓉江水-气界面CO₂交换速率（k）在2.71~13.0 m·d^-1范围内，pCO₂在78.5~21491.2 Pa范围内，且支流高于干流；河流表层水体TOC、TN和TP分别为（302.8±50.1）、（128.9±67.9）和（0.65±0.98）μmol·L^-1，整体表现为磷限制营养状态；河流pCO₂与磷及其相关的化学计量比显著耦合，说明微生物新陈代谢是河流CO₂饱和的主要原因；芙蓉江水-气界面CO₂排放通量（F）为（534.5±801.4） mmol·（m²·d）^-1，高于一些世界河流，具有巨大的CO₂排放潜力. 英文摘要 To explore water-air carbon dioxide (CO₂) exchange and its nutritional controls in karst rivers, water sampling and analyses were conducted in the Furong River as a representative karst river system. Regional hydrometeorological characteristics, carbonate system parameters, total organic carbon (TOC), nutrients and their stoichiometric ratios, and the riverine pressure of aqueous CO₂ (pCO₂) and its couplings to trophic status were analyzed. The results showed that gas transfer velocity of CO₂ (k) varied between 2.71 and 13.0 m·d^-1. Riverine pCO₂ varied from 78.5 Pa to 21491.2 Pa and was significantly higher in the tributaries than the main stem. Riverine TOC, total nitrogen (TN), and total phosphorus (TP) concentrations were (302.8±50.1), (128.9±67.9), and (0.65±0.98) μmol·L^-1, respectively, demonstrating the trophic status of P-limitation. Riverine pCO₂ was tightly linked to P-related parameters, suggesting that in-situ metabolism triggered aquatic CO₂ supersaturation. Water-air CO₂ flux (F) averaged (534.5±801.4) mmol·(m²·d)^-1 in the Furong River, which is higher than most of the world's rivers, and thus indicates high potential CO₂ emissions.

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