Eight Mile Lake Research Watershed, Carbon in Permafrost Experimental Heating and Drying Research (DryPEHR): GPS Plot Locations

This drying and warming experiment addresses the following questions: 1) Does ecosystem drying, warming and permafrost thaw cause a net release or uptake of C from the ecosystem to the atmosphere?, 2) Does the decomposition of old C that comprises the bulk of the soil C pool influence ecosystem C loss? 3) How do drying and warming affect plant communities and ecosystem properties? We are answering these questions using a combined warming and drying experiment (DryPEHR), which is situated with the Carbon in Permafrost Experimental Heating Research (CiPEHR) project and located in an upland tundra field site near Healy, Alaska in the foothills of the Alaska Range. Warming treatment here refers to growing season air temperature warming (~1C) using open top chambers (OTC) combined with soil 'warming' using snow fences during the snow covered months. Drying is achieved using an automated pumping system that lowers the water table in the dry plots. Soil warming began in 2008; OTCs and drying in 2011. This dataset contains plot locations made using a differential GPS with real time kinematic correction in early August of 2017.本干化增温实验旨在解答以下三项核心科学问题：1）生态系统干化、增温与多年冻土消融（permafrost thaw）是否会引发生态系统向大气的碳净排放或吸收？2）占土壤碳库主体的老碳分解过程是否会对生态系统碳损失产生影响？3）干化与增温如何作用于植物群落与生态系统属性？本研究依托联合干化增温实验（DryPEHR）开展，该实验与多年冻土碳加热实验研究（Carbon in Permafrost Experimental Heating Research，简称CiPEHR）项目协同设置于阿拉斯加山脉山麓、阿拉斯加州希利镇附近的高地苔原野外站点。本实验的增温处理方案为：生长季采用开顶式气室（open top chambers，简称OTC）实现约1℃的空气增温，并在积雪期通过布设雪障（snow fences）实现土壤“增温”；干化处理则通过自动抽水系统（automated pumping system）降低干旱样地的地下水位完成。土壤增温实验于2008年正式启动，而OTC安装与干化处理则于2011年开始实施。本数据集包含2017年8月初通过带实时动态差分校正的差分全球定位系统（differential GPS with real time kinematic correction）采集得到的样地位置数据。