Data Set Summary
| Item | Value |
|---|---|
| Dataset ID: | ltn |
| Dataset Title: | SGS-LTER Long Term Nitrogen Percentages in Grass, Forb and Shrub Species on the Central Plains Experimental Range, Nunn, Colorado, USA 1983 - 2008 |
| Abstract: | Aboveground plant nitrogen dynamics monitoring consists of two separate data sets. a) Long-term peak-crop nitrogen concentrations have been sampled since 1983 annually from sites sampled for ANPP estimates across the CPER. Plots are clipped for ANPP in August each year and include moderately grazed sites in sections 24 and 25, ungrazed treatments at ESA and owl creek, coarse textured soils in owl creek, fine textured soils in section 25, as well as three catena topopositions in section 24. These datasets have been designed for monitoring and so it is advised to consider calcuating average based at the transect level. B) Seasonal dynamics of life-form (dominant grass, forb, shrub species) nitrogen concentrations were obtained from random grab samples of aboveground plant tissue are taken monthly from May-Aug. and in Oct., Dec., Feb., and April from 1983 – 2007 at sites where ANPP has been collected since 1983 (ESA, ridge, mid-slope and swale in section 24). The objectives are to assess annual/seasonal weather and site productivity/management with quantity and quality of forage and/or litter production. Combined, these two data sets also provide an estimate of nitrogen yield. These data can be linked with secondary producer data sets such as annual cattle weight gains, grasshopper abundance, small mammal monitoring, etc., to assess how forage/plant tissue quantity and quality drive population dynamics. |
| Methods: | These samples are collected at the catena (section 24), esa (ecosystem stress area), and at the FS burns from April – September by the field crew. The site manager collects samples from the catena and esa in October, December, and February). Equipment: Pre-labeled coin envelops Clippers Rubber bands Coffee can At the catena the envelopes are labeled: N-Harvest Day-Mo-Yr Ridge 1, 2, 3 for each species GUSA, BOGR, SPCO Mid-Slope (same as above) Swale (same as above) At the esa: N-Harvest Day-Mo-Yr ESA 1, 2, 3 for each species GUSA, BOGR, SPCO |
| Principal Investigator: | Dan Milchunas |
| Long Term Contact: | Dan Milchunas: daniel.milchunas@colostate.edu |
| Public Access Status: | open |
| Begin Date: | 9/1/1983 |
| End Date: | 2008-02-31 |
| Sample Frequency: | |
| Long Term Experiment?: | Yes |
| Keywords: | nitrogen, organic nitrogen, landscape, catena, organic matter |
| Geographic Location: | Bounded by (40.857500N,-104.785833W) and (40.800278S,-104.730556E). Altitude Range: 1645.0 to 1675.1 Meters above sea level |
| Related Datasets: | (none) |
| Related Publications: | (none) |
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