Skip to main content

DAAC Home > Get Data > Regional/Global > Net Primary Production (NPP) > Data Files

NPP Grassland: Bridger, USA, 1970-1973, R1

Data Set Overview

Data setNPP Grassland: Bridger, USA, 1970-1973, R1
Release date2013-11-12
ProjectNet Primary Productivity (NPP)
Time Period1894-01-01 to 1994-12-31


This data set contains three ASCII text files for the Bridger grassland study site in the Rocky Mountains (45.78 N, -110.78 W, Elevation 2,340 m). Two files contain above- and below-ground biomass data, one for each treatment (ungrazed and moderately grazed). The third file contains climate data from the Big Timber weather station (45.80 N, -110.00 W, Elevation 1,249 m) near Bridger. Dynamics of above- and below-ground plant biomass were monitored by harvest technique at roughly 2-week intervals during the growing season for the years 1970, 1972, and 1973. Data on above-ground live biomass, standing dead matter, and litter are provided for each sampling date. Below-ground biomass (roots and crowns) are provided for 0-30 cm and 0-50 cm depths. 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). Above-ground net primary production (ANPP) was estimated, conservatively, by summing peak biomass of individual species. Below-ground net primary production (BNPP) was estimated as the sum of positive increments in total root biomass (including root crowns). Values varied according to treatment. Revision Notes: Only the documentation for this data set has been modified. The data files have been checked for accuracy and are identical to those originally published in 1998.


Data set reference document


Weaver, T.W., and D.D. Collins. 2014. NPP Grassland: Bridger, USA, 1970-1973, R1 . ORNL DAAC, Oak Ridge, Tennessee, USA.
Download citation from Datacite
Crosscite Citation Formatter

See our Data Citations and Acknowledgements policy for more information.


Net Primary Productivity (NPP): NPP (net primary production) data from existing field measurements are being compiled for approximately 100 study sites covering several major world ecosystem types. These data are used by global change modelers to develop and validate models of vegetation-soil-atmosphere interactions within the global carbon cycle and to help calibrate remote sensing of vegetation worldwide

Project data set list for Net Primary Productivity (NPP).

Companion Files

Sign In above to download companion files.

  • NPP_BRD.pdf

Data Files

Sign In above to download data set files.

Data File (Granule)File SizeDates
brd1_npp.txt 3.1 KB 1970-06-30 - 1973-09-18
brd_cli.txt 38.0 KB 1894-01-01 - 1994-12-31
brd2_npp.txt 2.7 KB 1970-06-29 - 1972-11-08


Publications using this data set

Download Statistics

Files related to this data set have been downloaded on 251 occasions since 2007-12-06, totaling 1233 files.