Physiological and environmental regulation of interannual variability in CO2 exchange on rangelands in the western United States

Authors

H. Wayne Polley, USDA-ARSFollow
William Emmerich, United States Department of Agriculture
James A. Bradford, United States Department of Agriculture
Phillip L. Sims, United States Department of Agriculture
Douglas H. Johnson, United States Department of AgricultureFollow
Nicanor Z. Saliendra, US Forest Service
Tony Svejcar, United States Department of Agriculture
Raymond Angell, United States Department of Agriculture
Albert B. Frank, United States Department of Agriculture
Rebecca L. Phillips, United States Department of Agriculture
Keirith A. Snyder, United States Department of Agriculture
Jack A. Morgan, United States Department of Agriculture

Document Type

Article

Date of this Version

2009

Comments

Published in Global Change Biology (2009).

Abstract

For most ecosystems, net ecosystem exchange of CO₂ (NEE) varies within and among years in response to environmental change.We analyzed measurements of CO₂ exchange from eight native rangeland ecosystems in the western United States (58 site-years of data) in order to determine the contributions of photosynthetic and respiratory (physiological) components of CO₂ exchange to environmentally caused variation in NEE. Rangelands included Great Plains grasslands, desert shrubland, desert grasslands, and sagebrush steppe.