flux_gep function

Calculates GEP

to calculate gross ecosystem production (GEP) from net ecosystem (NEE) exchange and ecosystem respiration (ER) as GEP = NEE - ER. Datetime and other variables to keep will be taken from the NEE measurement.

flux_gep(
  fluxes_df,
  type_col,
  datetime_col,
  f_flux = f_flux,
  id_cols,
  nee_arg = "NEE",
  er_arg = "ER",
  cols_keep = "none"
)

Arguments

• fluxes_df: a dataframe containing NEE and ER
• type_col: column containing type of flux (NEE or ER)
• datetime_col: column containing start of measurement as datetime
• f_flux: column containing flux values
• id_cols: columns used to identify each pair of ER and NEE
• nee_arg: argument designating NEE fluxes in type column
• er_arg: argument designating ER fluxes in type column
• cols_keep: columns to keep from fluxes_df. Values from NEE row will be filled in GEP row. none (default) keeps only the columns in id_cols, flux, type and datetime columns; all keeps all the columns; can also be a vector of column names.

Returns

a dataframe with GEP as NEE - ER in long format with GEP, NEE, and ER as flux type, datetime, and any column specified in cols_keep. Values of datetime and columns in cols_keep for GEP row are taken from NEE measurements.

Examples

data(co2_fluxes)
flux_gep(co2_fluxes, type, f_start, id_cols = "turfID",
cols_keep = c("temp_soil"))