摘要
地下水作为旱区湖泊的重要补给源,不仅是维系旱区湖泊生态环境健康的重要纽带,更在区域乃至全球碳循环中扮演着重要角色。旱区湖泊独特的水域环境和水生态格局使溶解性无机碳(dissolved inorganic carbon,DIC)循环成为碳汇研究焦点,然而,地下水对湖泊DIC动态的调控机制及其环境效应在以往研究中关注较少。文章综述了地下水在旱区湖泊水循环、碳循环及生态环境中的核心作用,重点明确了地下水补给主导下旱区湖泊水体DIC的典型特征;从水文驱动下的湖水DIC空间分异、混合作用控制的湖泊碳酸盐动态平衡、营养盐-有机质协同的生物地球化学反馈等方面,阐释了地下水对湖水DIC的关键影响机制;梳理了湖水-地下水相互作用、水-气界面CO_(2)通量原位监测、碳同位素示踪、数值模拟等技术在湖水DIC碳循环研究中的应用进展。研究表明,地下水输入通过影响湖水水化学环境和水动力过程,及其与生物过程和化学过程耦合,共同决定了旱区湖泊的碳源/汇的动态特征。未来研究中,亟需深入量化水文路径与生物地球化学反应对DIC循环的协同/拮抗效应,重点关注人工补水型湖泊的独特碳循环特征,发展基于湖泊碳循环效应的适应性水资源与生态环境管理策略。深入理解地下水对湖水DIC循环的影响,可为准确评估旱区湖泊碳收支及其区域环境效应提供重要科技支撑。
Groundwater serves as a crucial source of replenishment for lakes in arid regions.It not only acts as an important link in maintaining the ecological health of these lakes,but also plays a vital role in the terrestrial ecosystem carbon cycle.The unique aquatic environment and hydro-ecological patterns of arid lakes make HCO-3dissolved inorganic carbon(DIC)a key component in the lake carbon cycle.Dissolved CO_(2) and,the main forms of DIC,are the primary sources for photosynthesis and organic matter production.Phytoplankton absorb DIC to synthesize organic carbon,part of which is oxidized and decomposed by microorganisms,while the rest settles and is buried in the sediment,rendering the lake a“sink”for CO_(2).However,the formation of calcium HCO-3carbonate precipitates from Ca2+and can increase the partial pressure of CO_(2) in the lake water,causing the lake to act as a“source”of CO_(2).This study reviews the critical role of groundwater in the hydrological balance,carbon balance,and ecological balance of arid region lake systems.It identifies the characteristics of DIC in arid regions such as lake water.It elucidates how groundwater affects lake DIC through water cycling,hydrogeochemical interactions,and nutrient input.The applicability of monitoring technologies,carbon isotope techniques,and model simulations in studying lake DIC is also summarized and compared.Finally,future research directions for the DIC cycle in arid region lakes are proposed,focusing on the mechanisms of hydrological and biogeochemical processes influencing lake DIC,the carbon cycle characteristics of artificially replenished lakes,and the effects of lake carbon cycling and adaptive management strategies.
作者
陈洁
钱会
李培月
马荣
徐子博
杨雨晨
CHEN Jie;QIAN Hui;LI Peiyue;MA Rong;XU Zibo;YANG Yuchen(Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region,Chang’an University,Ministry of Education,Xi’an,Shaanxi 710054,China;State Key Laboratory of Loess Science,Chang’an University,Xi’an,Shaanxi 710054,China;School of Water and Environment,Chang’an University,Xi’an,Shaanxi 710054,China;Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences,Shijiazhuang,Hebei 050061,China;Key Laboratory of Quaternary Geochronology and Hydro-environmental Evolution,China Geological Survey,Shijiazhuang,Hebei 050061,China)
出处
《水文地质工程地质》
北大核心
2025年第5期10-23,共14页
Hydrogeology & Engineering Geology
基金
国家自然科学基金项目(42272289,42007184,42341102)
中央高校基本科研业务费项目(300102294906,300102294902)。
