| 雷琨,毛宇琪,焦坤灵,李娇娇,朱梦涛.乌梁素海CO2和CH4溶存特征及水-气界面交换通量[J].农业环境科学学报,2026,45(4):1021-1031. |
| 乌梁素海CO2和CH4溶存特征及水-气界面交换通量 |
| Dissolved characteristics and water-air interface exchange fluxes of CO2 and CH4 in Wuliangsuhai |
| 投稿时间：2025-04-23 |
| DOI：10.11654/jaes.2025-0386 |
| 中文关键词: CO2 CH4 分压和通量 富营养化 乌梁素海 |
| 英文关键词: CO2 CH4 partial pressure and exchange flux eutrophication Wuliangsuhai |
| 基金项目:内蒙古自治区直属高校基本科研业务费（2023QNJS136）；内蒙古自然科学基金项目（2025QN04024）；中央引导地方科技发展资金项目（2024ZY0123） |
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| 中文摘要: |
| 为探究我国干旱-半干旱区浅水湖泊水-气界面CO2和CH4交换通量的时空差异及驱动因素，以乌梁素海不同功能区（入湖口、芦苇区、藻类区和湖水区）表层和底层湖水为研究对象，于2024年夏季和秋季采集气样和水样，通过静态箱法和顶空平衡法计算湖泊CO2和CH4的分压和交换通量，并结合水环境因子和富营养指标，探讨水-气界面CO2和CH4的交换过程。结果表明：CO2在夏季和秋季分别表现为碳源（+8 654.14 mg·m-2·d-1）和碳汇（-5 913.31 mg·m-2·d-1），入湖口处及夏季藻类区水体表现为CO2的汇，其他功能区均为CO2的源。CH4在不同季节持续排放（+86.32~+4 359.44 mg·m-2·d-1），且入湖口与芦苇区释放量较高。表层和底层水体CO2分压差异是造成CO2垂向迁移的主要原因，但受季节温度、富营养化程度以及溶解性有机碳的影响，夏季底层水体中CO2迁移至表层后被消耗，从而促进吸收大气中的CO2，秋季CO2在底层水体中产生后向表层迁移富集并向大气释放。 |
| 英文摘要: |
| This study takes Wuliangsuhai, a large shallow lake in the arid to semi-arid regions of China, as a case study to investigate the spatiotemporal variations and driving factors of CO2 and CH4 exchange fluxes at the water-air interface. During the summer and autumn of 2024, samples of gas, surface and bottom water were collected from four functional zones（lake inlets, reed areas, algal areas, and lake areas） of Wuliangsuhai. The partial pressures and exchange fluxes of CO2 and CH4 were quantified using static chamber（Pc and Pm） and headspace equilibrium（Fc and Fm） methods. Seasonal dynamics of CO2 fluxes showed a clear shift from a source（+8 654.14 mg·m-2·d-1 in summer to a sink（-5 913.31 mg·m-2·d-1） in autumn. Spatially, CO2 was sequestered in the lake inlet and summer algal areas, whereas all other functional zones consistently emitted CO2. CH4 exhibited emissions across different seasons, with fluxes ranging from +86.32- +4 359.44 mg·m-2·d-1. The lake inlets and reed areas were identified as hotspots, exhibiting significantly elevated CH4 release compared to other functional zones. The vertical CO2 transport was governed by the Pc gradient between surface and bottom water. Seasonal temperature, eutrophication and DOC mediated distinct CO2 pathways. In summer, CO2 produced in bottom waters migrated upward but was assimilated by surface phytoplankton, driving atmospheric CO2 uptake. In autumn, CO2 accumulated in bottom waters and then ascended to the surface, ultimately releasing into the atmosphere. |
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