CCZO -- Soil Gas, Soil Moisture, Soil Temperature -- Research area 1 -- (2016-2019)

Zachary Brecheisen, with help from Dan Richter, Will Cook, and others, augered and install 66 soil gas wells at various depths at 15 locations in the Calhoun CZO. Three of these locations are instrumented and continuously monitored, with data recorded every 30 minutes on a Campbell CR1000 datalogger, the rest sampled manually every 3 weeks. Installation occurred in the winter of 2015 through summer 2016. The continuously monitored gas wells target 3 different land use comparisons on flat upland topography. The land uses consist of a reference hardwood forest minimally degraded by human activity, an old-field secondary succession pine forest ~60 years old, and 1 plowed agricultural plot which has been, to the best of our knowledge, continually cultivated since at least the 1930s. The goal of this sampling is to identify anthropogenic biogeochemical signals in the soil profile of cultivated lands and to evaluate their persistence (or lack thereof) in old-field pine forests relative to reference hardwoods.

Methods:

Gasses measured include O2 (Apogee) and CO2 (Vaisala) probes located in soil gas wells at 25, 50, and 150 cm depths. Data are logged on a Campbell CR1000 datalogger every 30 minutes. Daily average values are computed.

Measurements (depths in cm):

Soil CO2: 50, 150 (all plots)

Soil O2: 50, 150 (all plots)

Soil temperature: 0 (soil surface temperature probe), 25 (all plots via TDR probe), 50 (all plots via TDR and apogee O2 probe), 150 (all plots via Apogee O2 probe)

Soil moisture (TDR probe): 25 (all plots), 50 (all plots)

Sites:

R1P1 - pine forest 34.60739,-81.72279

R1C1 - cultivated field 34.61014,-81.72699

R1H1 - hardwood forest 34.60643,-81.72332
Date Range Comments: data collection is ongoing, with data logged every 30 minutes

在Calhoun区域控制点（CZO）的15个地点，Zachary Brecheisen及其同事在2015年冬季至2016年夏季期间，于不同深度安装了66个土壤气体井。其中，3个地点配备了仪器并进行了连续监测，数据每30分钟由Campbell CR1000数据记录器记录；其余地点则每3周手动采样一次。连续监测的气体井针对平坦的上坡地形上的3种不同土地利用进行比较。这些土地利用包括：受人类活动轻微退化的参考硬木森林、约60年历史的旧田次生松林以及1个自1930年代以来持续耕作的农业地块。本次采样的目的是识别耕作土地土壤剖面的人为生物地球化学信号，并评估其在旧田松林相对于参考硬木森林中的持久性（或缺乏持久性）。

研究方法：
测量的气体包括位于土壤气体井中25厘米、50厘米和150厘米深度的O2（Apogee）和CO2（Vaisala）探头。数据每30分钟由Campbell CR1000数据记录器记录，并计算每日平均值。

测量（深度以厘米为单位）：
土壤CO2：50厘米、150厘米（所有地块）
土壤O2：50厘米、150厘米（所有地块）
土壤温度：0厘米（土壤表面温度探头）、25厘米（所有地块通过TDR探头）、50厘米（所有地块通过TDR和Apogee O2探头）、150厘米（所有地块通过Apogee O2探头）
土壤水分（TDR探头）：25厘米（所有地块）、50厘米（所有地块）

地点：
R1P1 - 松林 34.60739,-81.72279
R1C1 - 农田 34.61014,-81.72699
R1H1 - 硬木森林 34.60643,-81.72332
日期范围注释：数据收集正在进行中，每30分钟记录一次数据。