Air and Soil Temperature in Hemlock Removal Experiment at Harvard Forest since 2004

The impending loss of hemlock trees due to hemlock woolly adelgid (Adelges tsugae) infestation is expected to lead to changes in the temperature regime of the forest understory. These changes will both drive succession and will themselves be altered by successional processes. Air temperature (1 m above forest floor) and soil temperature (at 10 cm depth) are measured at 1-minute intervals (hourly averages, minimum, and maximum are stored) using thermistors connected to Campbell 21-X dataloggers. Temperature measurements began 60-120 days prior to applications of the logging and girdling treatments, and will continue for the duration of the study.因铁杉球蚜（Adelges tsugae）侵染导致的铁杉林即将消亡，预计将引发林下温度格局的改变。此类变化既会驱动森林群落演替，同时其自身也会受演替过程的影响而发生改变。本研究采用连接于Campbell 21-X数据记录仪的热敏电阻，以1分钟为间隔采集林地表层1米处的空气温度与10厘米深度的土壤温度，并存储其小时均值、最小值与最大值。温度监测始于伐木与环剥处理实施前60至120天，且将贯穿整个研究周期。