Walnut Gulch Experimental Watershed, Lucky Hills (Carbon Dioxide and Water Flux)

The meteorological data and Bowen ratio energy balance systems (BREB) (Model 023/CO2 Campbell Scientific Inc., Logan, Utah, USA) data are used to calculate carbon dioxide and evapotranspiration (ET) fluxes at Lucky Hills. The stored Bowen ration instrument data from the measurement site were transmitted by radio daily to our research station in Tombstone, AZ. From there, they were transferred through an Internet connection to Tucson, AZ. The data were then divided into 5-day increments and inserted into a Quattro1 Pro spreadsheet file which had all the formulations to calculate flux of soil heat, latent heat, sensible heat, evapotranspiration rates (ET), and CO2 rates on the 20-min time step of the data. All instrument and calculated data were graphed in the spreadsheet file and thoroughly reviewed for any instrument problems or data stream collection issues. The shrub site is known as Lucky Hills, elevation 1372 m. The soil at this site is coarse-loamy, mixed, thermic Ustochreptic Calciorthids) with 3 to 8% slopes [NRCS Soil Survey, 2003]. The surface A horizon (0-6 cm) contains 650 g kg1 sand, 290 g kg1 silt, and 60 g kg1 clay with 290 g kg1 coarse fragments >2 mm, 8 g kg1 organic carbon, and 21 g kg1 inorganic carbon. Vegetation is dominated by creosotebush (Larrea tridentata (D.C.) Cov.), whitethorn Acacia (Acacia constricta Benth. (Fabaceae)), and tarbush (Flourensia cernua D.C. (Asteraceae)). Vegetation canopy height maintained an almost constant 1 m height.
Carbon dioxide and water fluxes are important components of watershed function. In order to study carbon dioxide and water flux as they exist over the Walnut Gulch Experimental Watershed (WGEW), two sites were selected on the basis of their ecosystem composition, one site being dominated by shrubs and the other a grass dominated plant community. Lucky Hills is the shrub site. Measurements were made from 1997 through the present at the two sites. Resources in this dataset:Resource Title: GeoData catalog record. File Name: Web Page, url: https://geodata.nal.usda.gov/geonetwork/srv/eng/catalog.search#/metadata/WalnutLuckyHills_jjm_2015-03-20_1241

本数据集采用气象数据与鲍文比率能量平衡系统（BREB）数据（模型023/CO2，Campbell Scientific Inc.，犹他州洛根，美国），以计算幸运山地区的二氧化碳和蒸散量（ET）通量。测量站点储存的鲍文比率仪器数据通过无线电每日传输至亚利桑那州图森的研究站。随后，数据通过互联网连接传输至图森。数据被划分为5日增量，并插入配备所有公式的Quattro1 Pro电子表格文件中，用于计算土壤热通量、潜热、显热、蒸散速率（ET）和二氧化碳速率在数据20分钟时间步长上的通量。所有仪器和计算数据均在电子表格文件中进行绘图，并经过仔细审查，以检查任何仪器故障或数据流收集问题。灌木地幸运山的海拔高度为1372米。该地区的土壤为粗砂壤土、混合型、热性乌斯托赫雷皮克钙质土，坡度介于3%至8%之间[美国自然资源保护局土壤调查，2003]。表层A层（0-6厘米）含有650克每千克砂、290克每千克粉砂、60克每千克粘土，以及290克每千克大于2毫米的粗碎屑、8克每千克有机碳和21克每千克无机碳。植被主要由三裂刺柏（Larrea tridentata (D.C.) Cov.）、白刺刺槐（Acacia constricta Benth. (Fabaceae)）和橡胶树（Flourensia cernua D.C. (Asteraceae)）构成。植被冠层高度维持在一个几乎恒定的1米高度。二氧化碳和水通量是流域功能的重要组成部分。为了研究在核桃峡谷实验流域（WGEW）中存在的二氧化碳和水通量，根据其生态系统组成选择了两个研究点，一个以灌木为主，另一个以草本植物群落为主。幸运山为灌木地。自1997年起至现在，在两个地点进行了测量。本数据集资源：资源标题：GeoData目录记录。文件名：网页，URL：https://geodata.nal.usda.gov/geonetwork/srv/eng/catalog.search#/metadata/WalnutLuckyHills_jjm_2015-03-20_1241