# Title of Dataset: Depth-dependent effects of ericoid mycorrhizal shrubs on soil carbon and nitrogen pools are accentuated under arbuscular mycorrhizal trees --- This dataset includes equivalent soil mass carbon and nitrogen stocks for two soil organic matter fractions (particulate and mineral-associated organic matter) from three soil layers (Oa, surface A horizon, subsurface A horizon) in subplots with and without understory ericoid mycorrhizal (ErM) shrubs across gradients of varying overstory arbuscular (AM) versus ectomycorrhizal (EcM) tree relative basal area in three temperate forest sites in the northeastern U.S. In addition, this dataset includes total soil organic matter, microbially-available carbon, and active microbial biomass stocks for each of the three soil depths. ## Description of the Data and file structure This dataset contains two tabs. The first ("Data by soil layer") contains equivalent soil mass stocks and associated data for each of the three soil layers. The second ("Data by subplot") contains equivalent soil mass stocks and associated data at the subplot level (i.e. summed across the three equivalent soil mass layers). "Data by soil layer" tab: site: One of three forest stands from which soils were collected at a forest in northeastern Connecticut, USA. plot: Plot number within each site. We collected samples from six 10-m radius plots within each of the three sites subplot: We collected samples from two 1-m radius subplots nested within each plot. L = "Laurel." Subplot with the ErM shrub Kalmia latifolia N = "No Laurel." Subplot without the ErM shrub Kalmia latifolia soil_layer: We analyzed samples from three equivalent soil mass layers within each subplot. Oa = the organic equivalent soil mass layer (~2.5 kg soil m-2) D1 = the surface mineral equivalent soil mass layer (~37 kg soil m-2) D2 = the subsurface mineral equivalent soil mass layer (~126 kg soil m-2) unique_ID: Unique combination of site, plot, subplot, and soil layer GWCper: Gravimetric water content; percent soil moisture on a mass basis SOMper: Loss on ignition; percent soil organic matter Cmin: Carbon mineralization concentration (units = ug g dry wt soil-1 14 days-1), which is a measure of microbially-available carbon SIR: Substrate induced respiration (units = ug CO2 g dry wt soil-1 h-1), which is a measure of active microbial biomass Depth_upper_cm: Upper depth of the sampled soil layer (cm). Used with the SimpleESM function to calculate sampling depth for the equivalent soil mass stock calculations. Depth_upper_cm: Lower depth of the sampled soil layer (cm). Used with the SimpleESM function to calculate sampling depth for the equivalent soil mass stock calculations. BD: Soil bulk density (g cm-3) POC: g of carbon in particulate organic matter per kg total dry soil mass PON: g of nitrogen in particulate organic matter per kg total dry soil mass MAOC: g of carbon in mineral-associated organic matter per kg total dry soil mass MAON: g of nitrogen in mineral-associated organic matter per kg total dry soil mass Total_C: g of carbon per kg total dry soil mass Total_N: g of nitrogen per kg total dry soil mass soil_mass_esm1: Exact kg dry soil mass that equivalent soil mass stocks were calculated for C_stock_esm1: kg total carbon per equivalent soil mass layer (see "soil_mass_esm1" field for dry soil mass) N_stock_esm1: kg total nitrogen per equivalent soil mass layer (see "soil_mass_esm1" field for dry soil mass) Total_CN_esm1: Total carbon-to-nitrogen ratio by equivalent soil mass layer MAOC_stock_esm1: kg mineral-associated organic carbon per equivalent soil mass layer (see "soil_mass_esm1" field for dry soil mass) MAON_stock_esm1: kg mineral-associated organic nitrogen per equivalent soil mass layer (see "soil_mass_esm1" field for dry soil mass) MAOM_CN_esm1: Mineral-associated carbon-to-nitrogen ratio by equivalent soil mass layer POC_stock_esm1: kg particulate organic carbon per equivalent soil mass layer (see "soil_mass_esm1" field for dry soil mass) PON_stock_esm1: kg particulate organic nitrogen per equivalent soil mass layer (see "soil_mass_esm1" field for dry soil mass) POM_CN_esm1: Particulate organic carbon-to-nitrogen ratio by equivalent soil mass layer Cmin_stock_esm1: Carbon mineralization (microbially-available C) equivalent soil mass layer stocks (g CO2-C 14d-1 per mass soil in the equivalent soil mass layer) SIR_stock_esm1: Substrate induced respiration (active microbial biomass) equivalent soil mass layer stocks (g CO2-C h-1 per mass soil in the equivalent soil mass layer) SOM_stock_esm1: kg soil organic matter per equivalent soil mass layer (see "soil_mass_esm1" field for dry soil mass) "Data by subplot" tab: site: One of three forest stands from which soils were collected at a forest in northeastern Connecticut, USA. plot: Plot number within each site. We collected samples from six 10-m radius plots within each of the three sites subplot: We collected samples from two 1-m radius subplots nested within each plot. L = "Laurel." Dubplot with the ErM shrub Kalmia latifolia N = "No Laurel." Dubplot without the ErM shrub Kalmia latifolia plot_id: unique combination of site, plot, subplot VWC_mean: Volumetric water content, or percent soil moisture on a volumetric basis. Mean of all sampling points over the course of the growing season. total_BA_m2_ha: Total tree basal area (m2 ha-1) perc_EcM_trees: Percentage of EcM tree basal area soil_mass_esm1: Exact kg dry soil mass that equivalent soil mass stocks were calculated for C_stock_esm1: kg total carbon per equivalent soil mass layer (see "soil_mass_esm1" field for dry soil mass) N_stock_esm1: kg total nitrogen per equivalent soil mass layer (see "soil_mass_esm1" field for dry soil mass) Total_CN_esm1: Total carbon-to-nitrogen ratio by equivalent soil mass layer MAOC_stock_esm1: kg mineral-associated organic carbon per equivalent soil mass layer (see "soil_mass_esm1" field for dry soil mass) MAON_stock_esm1: kg mineral-associated organic nitrogen per equivalent soil mass layer (see "soil_mass_esm1" field for dry soil mass) MAOM_CN_esm1: Mineral-associated carbon-to-nitrogen ratio by equivalent soil mass layer POC_stock_esm1: kg particulate organic carbon per equivalent soil mass layer (see "soil_mass_esm1" field for dry soil mass) PON_stock_esm1: kg particulate organic nitrogen per equivalent soil mass layer (see "soil_mass_esm1" field for dry soil mass) POM_CN_esm1: Particulate organic carbon-to-nitrogen ratio by equivalent soil mass layer Cmin_stock_esm1: Carbon mineralization (microbially-available C) equivalent soil mass layer stocks (g CO2-C 14d-1 per mass soil in the equivalent soil mass layer) SIR_stock_esm1: Substrate induced respiration (active microbial biomass) equivalent soil mass layer stocks (g CO2-C h-1 per mass soil in the equivalent soil mass layer) SOM_stock_esm1: kg soil organic matter per equivalent soil mass layer (see "soil_mass_esm1" field for dry soil mass) ## Sharing/access Information Links to other publicly accessible locations of the data: N/A Was data derived from another source? No If yes, list source(s): N/A