Soil moisture, temperature and relative humidity for subalpine forest permanent plots, 2017 - 2021.

We collected microclimate data for 12 permanent forest plots in subalpine forests and at alpine treeline at Niwot Ridge, Colorado, USA. We collected soil temperature (2015-2020), air temperature (2015-2020), air relative humidity (2015-2020), and soil moisture data (2015-2019). Soil temperature, air temperature, and air relative humidity data were collected year-round, but they are not necessarily continuous during the sample period due to instrument failure. The goal of winter soil temperature data collection was to estimate snow duration. Soil moisture was collected every two weeks from 2015-2019 and continuously from June to October in three sites in 2018 and 2019. See data for periods of sampling and methods for details on sampling interval and instrumentation.本数据集采集了美国科罗拉多州尼沃特岭（Niwot Ridge）亚高山森林及高山林线处的12个永久森林样地的微气候数据。采集的观测指标包括土壤温度（2015-2020年）、空气温度（2015-2020年）、空气相对湿度（2015-2020年）以及土壤湿度（2015-2019年）。其中，土壤温度、空气温度与空气相对湿度为全年不间断采集，但受仪器故障影响，采样周期内的数据未必完全连续。冬季土壤温度数据的采集目标为估算积雪持续时长。2015至2019年，土壤湿度为每两周采集一次；2018及2019年，另有3个样地于每年6月至10月开展连续采样。有关采样时段、采样间隔及仪器布设的详细信息，请参阅数据集配套的方法说明与采样周期文档。