Forest Ecosystem Monitoring Cooperative(802) 656-0683femc@uvm.eduwww.uvm.edu/femc705 Spear StreetSouth BurlingtonVermont05403United States of AmericaUnited States Geological Survey (USGS) United States Department of Agriculture (USDA) Natural Resources Conservation ServiceForest Ecosystem Monitoring Cooperative (FEMC) University of Vermont College of Agriculture and Life SciencesUnited States Department of Agriculture (USDA), Forest Service Green Mountain and Finger Lakes National ForestspartnerVermont Long-Term Soil Monitoring ProgramLong-term monitoring of forest soils is necessary to understand the effects of continued environmental change, including climate change, atmospheric deposition of metals, and recovery from acidic precipitation. A monitoring program was initiated in 2002 at five protected forest sites in Vermont, three in Mt. Mansfield State Forest and two in the Lye Brook Wilderness Area. Every 5 years at each site, ten soil pits are dug and sampled from subplots in a 50 × 50-m plot.Vermont Long-Term Soil Monitoring ProgramHalmanJoshuaWaiteCarlWilmotSandraBurtNancyShanleyJamieWangDeaneLawsonSeanVillarsThomasBaileyScottRossDonaldDuncanJamesWrightJenniferQuintanaAngelicahuman disturbancelong term monitoringsoilcontinuous forest inventory vermont forestsforest regenerationMercury 2002 to 20222002-01-01Total mercury in the uppermost Oa or A horizon from each of the sampled subplots from 2002 through 2022. Additional data include total organic carbon, total nitrogen, horizon thickness, calculated bulk density, and estimated mercury pool in the sampled horizon.20241121195824_Mercury and carbon data 2002-2022.xlsxVMC.161.3977mySQLhttps://www.uvm.edu/femc/CI4/data/archive/project/long-term-soil-monitoring/dataset/mercury-2002-to-2022YearSampling yearintD-M-YY-1SiteSite abbreviationLR: Lye Road LT: Lye Trail MR: Mansfield Ranch MF: Mansfield Forehead MU: Mansfield UnderhilltextD-M-YY-1Plotsubplot sampledRandomly chose 5x5 m subplot from a 50x50 m grid. Beginning in 2017, a specific 1/4 quadrant of each plot was sampled (data not provided here)intD-M-YY-1Horz_Horizon designationBased on soil taxonomy current at the time, an A horizon had less than 200 g/kg carbon and an Oa horizon above thattextD-M-YY-1Site-codeSite code1 through 5 is LR, LT, MR, MF, MUintD-M-YY-1Yr-codeYear code1 through 5 is 2002, 2007, 2012, 2017, 2022intD-M-YY-1repreplicate number1 through 10 assigned in order of plot number (usually)intD-M-YY-1_Total_Hg_ug/kgTotal mercuryTotal mercury in the soil sample in ug per kgdecimalD-M-YY-1Organic_carbon_g/kgTotal organic carbonTotal organic carbon in the soil sample in g per kgdecimalD-M-YY-1THg/C_mg/kgTotal mercury to carbon ratioTotal mercury divided by total organic carbon in ug per kgdecimalNitrogen_g/kgTotal nitrogenTotal nitrogen in the soil layer by elemental analyzerdecimalD-M-YY-1Horizon_thickness_cmThickness of horizonThickness of the horizon sampled as listed in the full pit descriptiondecimalD-M-YY-1Calculated_bulk_densityBulk density calculated from organic carbonBulk density calculated from carbon using the equation in Huntington et al. 1989. Carbon, organic matter, and bulk density relationships in a forested spodosol. Soil Science 148, 380-386decimalD-M-YY-1kg_soil_per_m2Mass of the soil horizon per m2 (kg)The mass of the soil horizon per square meter, calculated from bulk density and horizon thickness. Used to calculate poolsdecimalD-M-YY-1mg_THg_per_m2Mercury poolPool of total mercury in the horizon sampled. Calculated from THg concentration and the mass of the soil horizon per square meterdecimalD-M-YY-1