Processed Net N2 Flux and Nitrous Oxide Production Rates from a mesocosm experiment, North River, MA, 2022

The data documented here show nitrogen cycling rates (net N2 flux and net N2O flux) from a tidal, freshwater wetland under two stressors in isolation and in combination over two different disturbance regimes. We used intact core mesocosms to examine how nitrogen cycling changed in response to increased temperature and salinity under pulse and press disturbances. We found that net N2 flux rates, defined as the balance between nitrogen fixation and denitrification did not directionally change in response to stressor pulse or press. Instead, it became more variable under both disturbance regimes. Nitrous oxide production rates, however, decreased and became more stable over time in the press scenario, but remained highly variable in the pulse scenario. These findings provide valuable knowledge on the functional potential of the nitrogen cycling microbial communities in tidal, freshwater wetlands when facing future climate variability.本数据集所记录的数据，来自潮汐淡水湿地在两种胁迫因子单独施加与联合施加、以及两种不同干扰模式下的氮循环速率（净N₂通量与净N₂O通量）。本研究采用原状核心中宇宙实验系统，探究了脉冲式与持续性干扰情境下，温度升高与盐度升高对氮循环过程的影响。研究发现，被定义为固氮作用与反硝化作用平衡的净N₂通量速率，并未因胁迫因子的脉冲或持续性干扰发生定向变化，反而在两种干扰模式下波动幅度均有所增大。而一氧化二氮（N₂O）产生速率在持续性干扰情境下随时间推移呈下降趋势且稳定性提升，但在脉冲干扰情境下仍保持较高波动水平。本研究结果可为揭示潮汐淡水湿地氮循环微生物群落在未来气候变异条件下的功能潜力提供重要参考。