Belowground nitrogen cycling in a montane grassland exposed to elevated CO2, warming and drought

#### Data description
Data from a multi-factorial global change experiment (elevated CO₂, warming and drought) in a montane grassland experiment in Austria (ClimGrass). Variables presented are soil nitrogen cycling rates measured using isotope pool dilutions.

Companion paper will be linked following manuscript publication.

#### Metadata
climgrass_soil_N_cycling.csv data description

Year: 2017
Harvest: three harvests (May 30, July 25, October 3)
Season: numerical column for harvest number
Plot: location of plot within the ClimGrass experiment
Treatment: eight treatment levels
    c0t0 (ambient CO₂, ambient temperature)
    c0t1 (ambient CO₂, + 1.5°C)
    c0t2 (ambient CO₂, + 3°C)
    c1t1 (+150 ppm, +1.5°C)
    c2t0 (+300 ppm, ambient temperature)
    c2t2 (+300 ppm, +3°C)
    c0t0-d (ambient CO₂, ambient temperature, extended drought)
    c2t2-d (+300 ppm, +3°C, extended drought)
CO2_ppm: three values of carbon dioxide enrichment treatment (+0, +150, or +300 ppm)
Temp_C: three values of elevated temperature treatment (+0, +1.5, +3°C)
Drought: two levels (control, drought)
Prot_depoly: gross protein depolymerization rates (micrograms nitrogen per grams dry soil per day = µg N g-1 d-1)
FAA_uptake: gross free amino acid uptake rates (µg N g-1 d-1)
MRT_FAA_hrs: mean residence time of free amino acids (hours)
FAA: free amino acids (µg N g-1)
Mineralization: gross mineralization rates (µg N g-1 d-1)
Nitrification: gross nitrification rates (µg N g-1 d-1)

#### References
Additional information on the experimental design can be found in the following paper:
Piepho, H.-P., Herndl, M., Pötsch, E.M., Bahn, M., 2017. Designing an experiment with quantitative treatment factors to study the effects of climate change. Journal of Agronomy and Crop Science 203, 584–592. doi:https://doi.org/10.1111/jac.12225

More information on the isotope pool dilution method used can be found in the following paper:
Wanek, W., Mooshammer, M., Blöchl, A., Hanreich, A., Richter, A., 2010. Determination of gross rates of amino acid production and immobilization in decomposing leaf litter by a novel 15 N isotope pool dilution technique. Soil Biology and Biochemistry 42, 1293–1302. doi:10.1016/j.soilbio.2010.04.001