Climate Change Across Seasons Experiment (CCASE) at the Hubbard Brook Experimental Forest: Soil Water Isotopic Composition

Natural abundance stable isotopes of oxygen and hydrogen in soil water
were measured adjacent to the Climate Change Across Seasons Experiment
(CCASE) plots. There are six plots total (each 11 x 14 m). Two are
warmed 5 degrees C throughout the growing season (Plots 3 and 4). Two
others are warmed 5 degrees C in the growing season and have snow
removed during winter to induce soil freezing and then warming cables
turn on to create thaws; each soil freeze/thaw cycle includes 72-hours
of soil freezing followed by 72-hours of thaw (Plots 5 and 6). Four
kilometers (2.5 mi) of heating cable are buried in the soil to warm
these four plots. Two additional plots serve as controls for our
experiment (Plots 1 and 2). This data set includes natural abundance
stable isotopes of oxygen and hydrogen in soil water from 2018. These data were gathered as part of the Hubbard Brook Ecosystem Study
(HBES). The HBES is a collaborative effort at the Hubbard Brook
Experimental Forest, which is operated and maintained by the USDA
Forest Service, Northern Research Station.

研究针对气候变化跨季节实验（Climate Change Across Seasons Experiment, CCASE）样地周边的土壤水，测定了其中氧与氢的天然丰度稳定同位素。实验共设置6块规格为11×14米的样地：其中3号、4号样地在整个生长季维持5℃增温处理；5号、6号样地在生长季实施5℃增温，且冬季移除积雪以诱导土壤冻结，随后开启加热电缆启动解冻流程，单次土壤冻融循环包含72小时的冻结阶段与72小时的解冻阶段。上述四块增温样地均通过埋设于土壤中的4千米（约2.5英里）加热电缆实现升温。剩余1号、2号样地作为本实验的对照样地。本数据集收录了2018年采集的上述土壤水中氧与氢的天然丰度稳定同位素数据。该数据为哈伯布鲁克生态系统研究（Hubbard Brook Ecosystem Study, HBES）的组成部分，该研究是依托哈伯布鲁克实验林开展的协作项目，由美国农业部林务局北方研究站运营维护。