Valizadeh Sara, Logozzo Laura A, Enayatizamir Naeimeh, Bogard Matthew J
Department of Biological Sciences, University of Lethbridge, Lethbridge, Alberta T1K 3M4, Canada.
Department of Soil Science, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz 6135783151, Iran.
ACS Omega. 2025 Jul 4;10(27):29014-29020. doi: 10.1021/acsomega.5c01053. eCollection 2025 Jul 15.
Wetlands and small inland waters are atmospheric sources of methane (CH), carbon dioxide (CO), and nitrous oxide (NO). Human activities are inducing the salinization of inland aquatic habitats, with unclear implications for greenhouse gas (GHG) emissions. Here, we show that GHG production is extremely sensitive to multiple salinization regimes (NaCl or MgSO amendments from 0.2 to ∼5 ppt salinity) in a mineral soil wetland sediment slurry incubation experiment. Production of CH decreased nonlinearly in both treatments, with more pronounced declines in MgSO treatments. Production of CO had contrasting patterns, increasing with MgSO but decreasing with NaCl additions, signaling divergent responses of sediment geochemistry and microbial respiration between treatments. Both treatments inconsistently stimulated NO production. Overall, we have shown that even small increases in salinity (<1 ppt) induce major shifts in wetland GHG production, but that responses depend heavily on salinization chemistry, a factor requiring consideration in future salinization research.
湿地和小型内陆水域是甲烷（CH）、二氧化碳（CO）和一氧化二氮（NO）的大气排放源。人类活动正在导致内陆水生栖息地盐碱化，这对温室气体（GHG）排放的影响尚不清楚。在此，我们表明，在一项矿质土壤湿地沉积物浆液培养实验中，温室气体的产生对多种盐碱化状况（0.2至约5 ppt盐度的NaCl或MgSO4添加）极为敏感。在两种处理中，CH的产生均呈非线性下降，在MgSO4处理中下降更为明显。CO的产生呈现出相反的模式，随MgSO4添加而增加，但随NaCl添加而减少，这表明不同处理之间沉积物地球化学和微生物呼吸的反应存在差异。两种处理对NO产生的刺激并不一致。总体而言，我们已经表明，即使盐度小幅增加（<1 ppt）也会导致湿地温室气体产生发生重大变化，但反应在很大程度上取决于盐碱化化学性质，这是未来盐碱化研究中需要考虑的一个因素。
