NPP Grassland: Bridger, U.S.A., 1970-1973


[PHOTOGRAPH]
Photograph: Targhee and Colombia sheep at the Bridger site (click on the photo to view a series of images from this site).

Data Citation

Cite this data set as follows:

Weaver, T., and D. D. Collins. 1998. NPP Grassland: Bridger, U.S.A., 1970-1973. Data set. Available on-line [http://www.daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A.

Description

Productivity of a mountain grassland was monitored at the Bridger study site during 1970 and 1972. Dynamics of above-ground plant biomass were monitored at roughly 2-week intervals during the growing season. Data on above-ground live biomass, standing dead matter and litter are available, for two replications of a grazed and an "ungrazed" (relatively undisturbed) treatment. Above-ground net primary production (ANPP) was estimated conservatively, by summing peak biomass of individual species, and below-ground net primary production (BNPP) estimated as the sum of positive increments in total root plus crown biomass.

Data were collected as part of a coordinated study over 1-3 years at ten grassland sites of the central and western United States, under the U.S. Grassland Biome Project of the International Biological Program (IBP).

The Bridger study site (45.78 N 110.78 W) is situated at the U.S. Forest Service Bangtail Ridge Ranger Station in the Rocky Mountains, 22 km northeast of the city of Bozeman, Montana. The ungrazed treatment area had been protected from grazing since 1930. The high mountain meadow is surrounded by forests dominated by Abies lasiocarpa and Pinus contorta.

Contact Information

Contact: Dr. W. K. Lauenroth
Natural Resource Ecology Laboratory
Colorado State University
Fort Collins, Colorado 80523
U.S.A.

Telephone: +1 (970) 491-7581
Fax: +1 (970) 491-1965
E-mail: billl@cnr.colostate.edu

Alternative Contact: Prof. T. Weaver
Department of Biology
Montana State University
P.O. Box 173460
Bozeman, MT 59717-3460
U.S.A.

Telephone: +1 (406) 994-3270/ 4548
Fax +1 (406) 994-6029
E-mail: tweaver@montana.edu

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