Jago Alaska Topography, Vegetation, Soils, and Site-Environmental Data 2009-2018

This data set contains topography, permafrost soils, vegetation, soil temperatures, and site environmental data collected near the Jago River, northwest Alaska for monitoring thermokarst. For field monitoring of topography, water depths, and thaw depths over time (8/14/2009, 8/31/2011, 7/27/2016, 8/1/2018), we sampled every meter along a 250-meter (m) transect oriented to cross replicate patches with differing degradation stages (Fig. SI2). For monitoring hydrology, soil, and vegetation over time, we used stratified, targeted sampling to establish three replicate permanent plots in each degradation stage (total 18), with the replicates broadly distributed along or near the transect. Plots for the undegraded stage, however, were not established until 2018. A subset of monitoring plots had dataloggers for sampling soil temperatures. In addition, soil and/or vegetation were sampled in 57 temporary plots established within representative patches away from the transect to increase sample sizes for each stage.

本数据集包含为监测热融喀斯特（thermokarst）而在阿拉斯加西北部雅戈河（Jago River）沿岸采集的地形、多年冻土土壤、植被、土壤温度及样地环境数据。针对地形、水深与解冻深度的长期野外监测（监测时间点为2009年8月14日、2011年8月31日、2016年7月27日、2018年8月1日），我们沿一条长250米的样带（transect）每间隔1米开展采样，该样带的布设旨在跨越多组不同退化阶段的重复斑块（补充图SI2）。为长期监测水文、土壤与植被状况，我们采用分层针对性采样方案，在每个退化阶段设置3个重复永久样地，总计18个样地，所有重复样地沿该样带或其邻近区域广泛分布。但未退化阶段的样地直至2018年才完成布设。部分监测样地配备了数据记录仪（datalogger）以采集土壤温度数据。此外，为扩大各退化阶段的样本量，我们在远离该样带的典型斑块内设立了57个临时样地，用于采集土壤和/或植被样本。