Manual soil CO2 flux, temperature and water content measurements from the Snodgrass and Copper Creek elevation transect

The manual_soil_measurements_2022_2023.csv data set contains all of the manually measured soil CO₂efflux, volumetric water content and soil temperature during field visits to the Rocky Mountain Biological Laboratory. In 2022, 16 PVC collars were installed at each site, there are two sets of collars, (n=4) PVC collars that are ~20” in diameter and placed in a 1x1 m square around the soil pit (Collar ID’s 1,2,3,4). The remaining collars (n=12, diameter= 4”) are placed within the forest type at each site, with four transects of three collars spaced at 3, 6 and 10m from the soil pit. For both types of collars, the soil CO₂ flux is measured using Flux Puppy, a field-portable system built around the Li-Cor 800 series IRGA (Carbone et al. 2019) Lids are placed on the collars and CO₂ is allowed to accumulate for 4 minutes (Large collars) and 3 minutes in (small collars). The flux is calculated by extracting the slope from the CO₂ accumulation curve using methods developed by (Trumbore lab).The large collars measurements were taken first, and lids were left on to accumulate CO₂ for radiocarbon samples. The small chambers were measured up to three times between 10:00-16:00 hr. Manual measurements were collected during four site visits in 2022, and one in 2023. Each soil CO₂flux is paired with manual vwc (Campell scientific Hydrosense) and soil temperature (Thermofisher) measurements at the collars. Vwc measurements were take 3 per collar to account for spatial heterogeneity around each collar. Soil temperature when taken, was taken during the flux measurements. Soil temp1 was taken during the first flux measurement at that collar, soil temp 2 and the second etc..Carbone, M. S., B. Seyednasrollah, T. T. Rademacher, D. Basler, J. M. Le Moine, S. Beals, J. Beasley, A. Greene, J. Kelroy, and A. D. Richardson. 2019. Flux Puppy – An open-source software application and portable system design for low-cost manual measurements of CO2 and H2O fluxes. Agricultural and Forest Meteorology 274:1–6.

manual_soil_measurements_2022_2023.csv 数据集收录了落基山生物实验室（Rocky Mountain Biological Laboratory）野外考察期间获取的全部手动测量土壤CO₂排放通量（soil CO₂ efflux）、体积含水量（volumetric water content, VWC）与土壤温度数据。2022年，每个样地均布设了16个聚氯乙烯（PVC）环，分为两组：其中4个（n=4）聚氯乙烯环直径约20英寸，以1×1米的正方形布局布置在土坑周边（环编号为1、2、3、4）；剩余12个聚氯乙烯环（n=12，直径4英寸）则布设于各站点的林分中，沿4条样带布设，每条样带内设置3个聚氯乙烯环，分别距离土坑3米、6米与10米。针对两类聚氯乙烯环，土壤CO₂排放通量均采用Flux Puppy系统进行测量——该系统是一款基于Li-Cor 800系列红外气体分析仪（Infrared Gas Analyzer, IRGA）开发的野外便携测量装置（Carbone等，2019）。测量时将盖子覆盖于环上，使CO₂累积4分钟（大环）与3分钟（小环）。通量计算通过提取CO₂累积曲线的斜率完成，所用方法由特伦布尔实验室（Trumbore lab）开发。测量优先开展大环数据采集，期间保持盖子闭合以累积CO₂用于放射性碳样品分析。小型环的测量在10:00至16:00时段内最多重复3次。本数据集的手动测量数据采集于2022年的4次野外考察与2023年的1次野外考察。每个土壤CO₂排放通量数据均配套对应环位的手动体积含水量（由Campbell Scientific公司Hydrosense设备采集）与土壤温度（由赛默飞世尔科技（Thermofisher）设备采集）数据。为表征每个环周边的空间异质性，每个环采集3次体积含水量测量数据；土壤温度测量同步于通量测量过程，每个环的首次通量测量时采集土壤温度1，第二次通量测量时采集土壤温度2，依此类推。本数据集引用的完整文献为：Carbone, M. S., B. Seyednasrollah, T. T. Rademacher, D. Basler, J. M. Le Moine, S. Beals, J. Beasley, A. Greene, J. Kelroy, 及 A. D. Richardson. 2019. 《Flux Puppy——一款用于低成本手动测量CO₂与H₂O通量的开源软件应用与便携系统设计》，《农业与森林气象学》（Agricultural and Forest Meteorology），274卷：1–6页。