Growing season trace gas and environmental measurements at an experimentally-warmed mesic tundra site

The data set was collected as an ongoing study at the Cape Bounty Arctic Watershed Observatory International Tundra Experiment (ITEX) site examining the environmental controls over trace gas respiration in High Arctic mesic tundra. The goal of the study is to characterize the relationships between plant-available nitrogen and productivity and to see how these relationships are manifested in hyperspectral signatures. These data files contain trace gas concentrations and environmental measurements from an ITEX mesic tundra experiment. Snow fences were set up at two sites of each replicate to determine the effect of snow depth on soil respiration. Four treatments were sampled with eight replicates: snow-control, snow-warmed, control-control, and control-warmed. PVC collars (20 cm diameter) were placed on the ground from which opaque, static, non-steady state chambers were used to obtain a 25 mL sample in 12-mL pre-evacuated glass vials (Exetainer 739B, Labco Limited, Buckinghamshire, UK). Vials were analyzed using gas chromatography according to methods by Wilson and Humphreys (2010). Environmental measurements (soil moisture, soil temperature, and active layer depth) were taken twice weekly at site adjacent to the collars.

本数据集采集自北极邦蒂角流域观测站国际冻原实验（International Tundra Experiment, ITEX）站点的长期研究，旨在探究高北极中湿冻原内微量气体呼吸作用的环境调控因子。本研究的核心目标是阐明植物有效氮与生产力之间的关联，并揭示此类关联如何在高光谱特征中得以体现。本数据集包含该ITEX中湿冻原实验产生的微量气体浓度与环境测量数据。研究在每个重复样地的两个站点设置雪栅栏，以探究雪深对土壤呼吸的影响。实验共设置4种处理，每组配置8个重复：雪控制组、雪加温组、对照-控制组、对照-加温组。在地表放置直径20 cm的聚氯乙烯（PVC）环，采用不透光静态非稳态箱采集25 mL样品，并将其注入12 mL预抽空玻璃小瓶（Exetainer 739B，英国白金汉郡Labco有限公司生产）。随后依照Wilson与Humphreys（2010）的方法，采用气相色谱法对小瓶内的样品进行分析。在紧邻聚氯乙烯环的站点，每周开展两次环境测量，测量指标涵盖土壤湿度、土壤温度与活动层厚度。