Nutrient losses in runoff from grassland and shrubland habitats in southern New Mexico: I. Rainfall simulation experiments --Nitrogen and phosphorus chemistry

This data set was collected to provide data for comparison of the losses
of dissolved nitrogen and phosphorus in the runoff from grass- and shrub-
dominated plots in the Jornada Basin of southern New Mexico. This dataset
contains the following columns:

Plot: the identification number for the plots, which are grouped
for grass, shrub or intershrub areas.

Fill Time: the time in seconds used to collect an individual
sample of discharge from the plot.

Time: the time in minutes (from the beginning of the rainfall
simulation) at which each individual collection of discharge
began. In each case, the first time listed is the time at which
discharge was first observed.

Time b/w samples: the time in seconds between the beginning the
collection of a given sample of discharge and the beginning of
the next collection.

Q: the rate of discharge during each collection, in cubic
centimeters per second.

AveQ/time: the total discharge during an interval in cubic
centimeters. For example, the discharge between 16 and 20
minutes is calculated as the mean of the discharge at l6 and 20
minutes multiplied by 4 minutes.

InorgN-rain (adjusted inorganic N): the concentration of NH4-N + NO3-N in
the discharge sample collected, corrected for the sum of the
concentration of these ions in the simulated rainfall applied.
Concentration is given in milligrams per liter for N contained in
the sum of these forms. Analysis for NH4-N and NO3-N was
performed using the Bran-Luebbe Traacs 800 Autoanalyzer, as
detailed in Schlesinger et al. (l999).

Total N-rain (adjusted total N): the concentration of total dissolved
N in the discharge sample collected, corrected for the
concentration of total dissolved N in the simulated rainfall
applied. Concentration is given in milligrams per liter of total
dissolved N in the sample. The concentration of total dissolved
N was performed using the Traacs 800 Autoanalyzer, following a
persulfate digestion of the sample, as detailed in Schlesinger et
al. (l999).

OrgN-rain (adjusted organic N): the concentration of N contained in
dissolved organic forms, corrected for the concentration of
dissolved organic N in the simulated rainfall applied. Dissolved
organic N is calculated as the difference, in any sample, between
the total dissolved N and the sum of NH4-N and NO3-N. Values are
in milligrams per liter.

Total P-rain (adjusted total P): the concentration of total dissolved
phosphorus, corrected for the concentration of total dissolved
phosphorus in the simulated rainfall applied, both in milligrams
per liter.

Org-P-rain (adjusted org P): the concentration of dissolved organic
phosphorus, corrected for the concentration of dissolved organic
phosphorus in the simulated rainfall applied, both in milligrams
per liter.

Inorg-N-rain (adjusted inorganic N), the yield in grams of NH4-N plus
NO3-N in the discharge collected.

TotalN-rain (adjusted total N), the yield in grams of total dissolved
N in the discharge collected.

OrgN-rain (adjusted organic N), the yield in grams of forms of dissolved
organic N in the discharge collected.

Total P-rain (adjusted total P), the yield in grams of total dissolved
phosphorus in the discharge collected.

OrgP-rain (adjusted organic P), the yield in grams of forms of dissolved
organic phosphorus in the discharge collected.

InorgN-rain (adjusted inorganic N) load, is the rate of loss, in grams per
second, of the sum of NH4-N plus NO3-N during the period of the
sample collection.

Total N-rain (adjusted total N) load, is the rate of loss, in grams
per second, of total dissolved N during the period of the sample
collection.

OrgN-rain (adjusted organic N) load, is the rate of loss, in grams per
second, of dissolved organic N during the period of the sample
collection.

Total P-rain (adjusted total P) load, is the rate of loss, in grams
per second, of total dissolved P during the period of the sample
collection.

Org-P-rain (adjusted organic P) load, is the rate of loss, in grams per
second, of dissolved organic P during the period of the sample
collection.