Eight Mile Lake Research Watershed, Thaw Gradient: half-hourly soil moisture 2010-2022

In this larger study, we are asking the question: Is old carbon that comprises the bulk of the soil organic matter pool released in response to thawing of permafrost? We are answering this question by using a combination of field and laboratory experiments to measure radiocarbon isotope ratios in soil organic matter, soil respiration, and dissolved organic carbon, in tundra ecosystems. The objective of these proposed measurements is to develop a mechanistic understanding of the SOM sources contributing to C losses following permafrost thawing. We are making these measurements at an established tundra field site near Healy, Alaska in the foothills of the Alaska Range. Field measurements center on a natural experiment where permafrost has been observed to warm and thaw over the past several decades. This area represents a gradient of sites each with a different degree of change due to permafrost thawing. As such, this area is unique for addressing questions at the time and spatial scales relevant for change in arctic ecosystems. This data set includes soil moisture intergrate over a 20cm soil profile at different locations within gradient of sites described.在这项大型研究中，我们提出核心研究问题：构成土壤有机质（soil organic matter, SOM）库主体的古老碳，是否会响应多年冻土（permafrost）解冻而被释放？ 我们将结合野外与实验室实验，测量苔原生态系统中土壤有机质、土壤呼吸以及溶解性有机碳（dissolved organic carbon, DOC）的放射性碳同位素比值，以此解答该问题。 本次测量的目标，是建立对多年冻土解冻后参与碳损失的土壤有机质碳源的机制性认知。 我们将在阿拉斯加山脉山麓、阿拉斯加州希利附近一处已布设完成的苔原野外监测站点开展上述测量工作。 野外测量聚焦于一项天然实验：该区域的多年冻土在过去数十年间持续增温并发生解冻。 该区域的采样站点构成了一条梯度序列，各站点因多年冻土解冻产生的环境变化程度各不相同。 因此，该区域是解答与北极生态系统变化相关的时间与空间尺度研究问题的独特实验区域。 本数据集包含沿上述站点梯度内不同点位的20厘米土层剖面的土壤含水率整合数据。