ReadMe file for “dataset_n2o_subsurface.xlsx” which contains data presented in: Shcherbak I, Robertson GP. 2018. Nitrous oxide (N2O) emissions from subsurface soils of agricultural ecosystems. Ecosystems doi: 10.1007/s10021-019-00363-z This file describes the data contained within “dataset_n2o_subsoil.xlsx” for the above publication. For additional information on the experiments described in this paper, see: LTER Main Cropping Systems Experiment (MCSE) https://lter.kbs.msu.edu/research/long-term-experiments/main-cropping-system-experiment/ Monolith Lysimeters https://lter.kbs.msu.edu/research/long-term-experiments/interaction-site-plots/ Resource Gradient Experiment https://lter.kbs.msu.edu/research/long-term-experiments/resource-gradient/ For additional data on the experiments described in this paper, search under the experiment of interest at https://lter.kbs.msu.edu/datatables For further inquiries please contact Iurii Shcherbak (yurann@gmail.com) or Phil Robertson (robert30@msu.edu). 1) Spreadsheet: subsoil_n2o Description: Concentrations of nitrous oxide (N2O) at different depths in soil profiles of three experiments at the Kellogg Biological Station (KBS) Long-term Ecological Research (LTER) site: LTER MCSE (in 2011), Monolith Lysimeters (in 2010-2011), and Resource Gradient Experiment (in 2011). Also includes data from additional MCSE treatments as well as concentrations of carbon dioxide (CO2) and methane (CH4) at same depths; not analyzed in publication. Data also available at https://lter.kbs.msu.edu/datatables/404 Variate Description site name of experiment (site) where measurements were taken (3 sites “LTER MCSE, Monolith Lysimeters, Resource Gradient”) sample_date date of soil sampling treatment name of treatment sampled (depends on site – see experiment descriptions for specifics. For LTER MCSE: 8 treatments “T1 – T8”. For Monolith Lysimeters: 2 treatments “CT, NT”. For Resource Gradient: Rainfed has 6 fertilization treatments “F1, F3, F4, F5, F6, F8”; Irrigated has 6 fertilization treatments “iF1, iF3, iF4, iF5, iF6, iF8) replicate replicate block (depends on site – see experiment descriptions for specifics. For LTER MCSE: 4 replicates “R1-R4”. For Monolith Lysimeters: 2 replicates “R1, R2”. For Resource Gradient: 1 replicate “R1”. fertilizer_rate amount of nitrogen applied, in kilogram N per hectare (for Resource Gradient only; 6 rates “0, 67, 101, 135, 168, and 246”) depth soil profile sampling depth, in centimeters (5 depths “10, 20, 30, 50, and 75”) n2o concentration of nitrous oxide at sampling depth, in microliters per liter co2 concentration of carbon dioxide at sampling depth, in milliliters per liter ch4 concentration of methane at sampling depth, in microliters per liter 2) Spreadsheet: flux_n2o Description: Surface fluxes of nitrous oxide (N2O) as measured by static or automatic chamber methods for three experiments at the Kellogg Biological Station (KBS) Long-term Ecological Research (LTER) site: LTER MCSE (in 2011), Monolith Lysimeters (in 2010-2011), and Resource Gradient Experiment (in 2011). Conversion of microliters N2O per liter air to grams N per hectare assumes a 1 cm layer. Also includes additional MCSE treatments and well as fluxes of carbon dioxide (CO2) and methane (CH4) in same chambers for LTER MCSE and Monolith Lysimeters; not analyzed in publication. Variate Description site name of experiment (site) where measurements were taken (3 sites “LTER MCSE, Monolith Lysimeters, Resource Gradient”) year year of flux measurement day_of_year day of year of flux measurement treatment name of treatment sampled (depends on site – see experiment descriptions for specifics. For LTER MCSE: 8 treatments “T1 – T8”. For Monolith Lysimeters: 2 treatments “CT, NT”. For Resource Gradient: 2 treatments “Rainfed, Irrigated” each with 6 fertilizer rates, as given below. replicate replicate block (depends on site – see experiment descriptions for specifics. For LTER MCSE: 4 replicates “R1-R4”. For Monolith Gradient: 2 replicates “R1, R2”. For Resource Gradient: 1 replicate “R1”. fertilizer_rate amount of nitrogen applied, in kilogram N per hectare (for Resource Gradient only; 6 rates “0, 67, 101, 135, 168, and 246”) n2o area-independent surface flux of nitrous oxide, in microliter per liter per hour (negative values = soil influx; positive values=soil efflux) co2 area-independent surface flux of carbon dioxide, in milliliter per liter per hour (negative values = soil influx; positive values=soil efflux) ch4 area-independent surface flux of methane, in microliter per liter per hour (negative values = soil influx; positive values=soil efflux)