Wetland greenhouse gas flux responses to experimental flooding and warming, Yukon-Kuskokwim Delta (Western Alaska, USA), 2022-2023.

This dataset was used to answer the question: how do flooding and warming alter carbon dioxide and methane flux from coastal wetlands of the Yukon-Kuskokwim (Y-K) Delta (Western Alaska, USA)? Over two years, we simulated periodic summer tidal flood events at two severity levels and passively increased summer temperatures in a full-factorial field experiment, and the response of gas measured the response of carbon dioxide and methane fluxes. We simulated low-severity and high-severity flooding to represent near-future flooding regimes for the Y-K Delta, projected respectively in the next ~5 and ~10 years. The experiment was established in a wet sedge-shrub meadow, an ecotype covering greater than 10% of the vegetated area of the central coast of the Y-K Delta. We measured gas fluxes approximately twice per week using static chambers during the summer of 2023.

本数据集用于解答如下科学问题：洪水与气候变暖将如何改变美国阿拉斯加西部育空-库斯科奎姆（Yukon-Kuskokwim, Y-K）三角洲滨海湿地的二氧化碳与甲烷通量？研究历时两年开展全因子野外控制实验，设置两种强度梯度的夏季周期性潮汐淹没事件，并实施被动式夏季升温处理，以气体通量变化表征二氧化碳与甲烷通量的生态响应。其中，低强度与高强度淹没情景分别对应Y-K三角洲未来约5年和约10年的预估淹没格局。实验样地设于湿生薹草-灌丛草甸，该生态型覆盖了Y-K三角洲中部海岸超过10%的植被覆盖区域。2023年夏季期间，研究团队采用静态箱法，约每周两次开展气体通量观测。