Low methane emissions from nutrient-rich former river channels in a hydrologically managed dryland delta
2026-05-05 LIMNOLOGY AND OCEANOGRAPHY LETTERS 2026 11(卷), 3(期), (null页)
JCR分区:
影响因子:
Anthropogenic stresses in dryland regions can alter hydrology, salinization, and biogeochemical processes. How these pressures influence methane (CH4) cycling and emissions from aquatic ecosystems remains poorly understood. Over the course of 1 year, we measured diffusive and ebullitive CH4 emissions from resacas-shallow, hydrologically managed distributary channels prevalent throughout the Lower Rio Grande Valley along the US-Mexico border. Despite warm, nutrient-rich waters, CH4 emissions from resacas were low, and more comparable to rates observed in estuarine systems. CH4 fluxes were positively related to temperature but negatively related to salinity and rainfall. Elevated salinity, driven by evaporation and source water from the salinized Rio Grande, may suppress methanogenesis. These findings highlight the complex interplay of salinity, hydrology, and management in shaping aquatic CH4 emissions from dryland regions. As dryland water bodies face growing salinization and warming temperatures, resacas offer valuable insight into CH4 dynamics in increasingly altered freshwater ecosystems.
关键词
相关推荐
- Agrivoltaic shading reduces soil greenhouse gas fluxes in a semi-arid vineyard [2026-05-05]
- Landscape Connectivity and Wildlife Access to Water Across an International Border: Barriers and Opportunities for Facilitating Transboundary Movement [2026-05-05]
- Applications of machine learning in enhancing evaporation estimation for small reservoirs: a case study in semi-arid South Texas [2026-05-05]
- Out of gas: re-flooding does not boost carbon emissions from drawdown areas in semiarid reservoirs after prolonged droughts [2026-05-05]
- Compost and Biochar to Promote Soil Biological Activities under Sweet Potatoes Cultivation in a Subtropical Semiarid Region [2026-05-05]