Nitrate, ammonium, total N, soluble reactive P, total P, and dissolved organic C are monitored in four streams draining watersheds with 1 (N01B), 2 (N02B), 4 (N04D), and 20 (N20B) year target burn frequencies. Bison have grazed these treatments since May 1992. The number of sites sampled has been expanded since 1992 to include sites that may reflect anthropogenic, groundwater, and bison influences on water chemistry. These sites include the south branch of Kings Creek as it leaves watershed N01A (tube), a site immediately below the NO4D weir at Konza Falls that is heavily influenced by groundwater (kzfl), the north fork of Kings Creek draining watersheds without bison (nfkc), the south fork of Kings Creek that drains the watersheds with bison (sfkc), Kings Creek below the USGS gauging station above the first agricultural field (hokn), a small creek that drains into Kings Creek after flowing past the bison handling facilities, two private residences, the site headquarters and an agricultural field (stck), a pristine prairie groundwater site (edlr), and Kings Creek at the bottom of Konza as it leaves the agricultural land in watershed AL (hikx). Early samples were preserved with phenyl mercuric acetate. Future plans to restore agricultural land to prairie may influence downstream nutrient concentrations.
To determine the effects of fire frequency on both baseflow and stormflow concentrations of nitrogen and phosphorus.
Location of Sampling Stations: Swede Creek Quadrangle (USGS) = NE1/4, NE1/4, NE1/4, W1/2, Sec 19, T11S, R8E. N01B flume: (N-22) N02B flune: (N-21) N04D flume: (L-22) N20B. flume: (N-22). Elder spring (EDLR): D-16 (fall and winter) or D-15 (spring & summer) Hiking Trail (HIKX): D-13
Hokanson Homestead (HOKN): H-15
North Fork Kings Creek (NFKC): 1-16
South Fork Kings Creek (SFKC): 1-16
Shane Creek (SHAN): T-9
Frequency of Sampling: Base flow samples are collected 3 times per week in mornings. If the base flow collection time corresponds to a storm flow event, they are classified as such.
Variable Measured: NO3N + NO2N, NH4 -N, total N, SRP (or soluble reactive phosphate), total P, and dissolved organic carbon.
Samples (250 mL) from mid-stream are collected 2-3 times per week. Date, time of day (CST), stream temperature (c) and stream height (N01B, N02B, N04D, and N20B only). Sub-samples (three 20mL vials) are taken upon returning to the lab. Samples are immediately frozen.
Laboratory Methods: One vial is analyzed for inorganic nitrogen (N) and phosphorous (P). A second vial is run for dissolved organic carbon (DOC). The third vial is run for TN or total nitrogen, and TP or total phosphorous. At the completion of all analyses the vial with maximum volume is stored in the freezer as an archived sample for 10 years from date of collection. Nitrogen and phosphorus nutrients are performed by colorimetric determination on a flow solution analyzer. Dissolved organic carbon is measured by high temperature combustion. Data is compiled annually, checked by the RA, and archived by the IM.
For additional metadata information see: http://lter.konza.ksu.edu/sites/default/files/DC.pdf
For additional methods information see: http://lter.konza.ksu.edu/sites/default/files/MM.pdf