2013 Annual Report
All work was completed prior to the start of FY2013. Progress was made on all three objectives and their sub objectives during the past 5 years. All the objectives covered in this report fall under National Program 215, Component 1, Problem A. Under Objective 1.A we continue to collect data on the hydrologic inputs and outflows from four small watersheds (< 100ha) near Jordan Valley, Oregon in far southeastern Oregon. This research is cooperative with the ARS unit in Boise, Idaho. The initial research conducted under Objective 1.B has been published and shows that deferment of grazing after prescribed fire had little impact on vegetation composition or productivity. Long-term measurements of both productivity and composition are being continued on the site. We continue to measure both climate and vegetation composition in and outside of our 13 grazing enclosures at the experimental range. This past year we also worked on summarizing and analyzing 70 years of climate data from the experimental range. The climate summarization is complete and we added several adjacent weather stations to the analysis. Vegetation analysis is in progress. The focus this past year under Objective 2 has been to summarize and analyze the large data sets associated with the livestock behavior using global positioning system (GPS) research. The data relates to grazing behavior of different classes of cows, and factors influencing grazing distribution in very large pastures (> 25,000 ha). For objective 3.A, several manuscripts have been submitted. Results associated with objective 3.B have been published and results from objective 3.C have been published and additional publications are in progress. Objective 3.D is focused on long-term vegetation trends after juniper management; initial response data has been published and the vegetation measurements are ongoing.
Boyd, C.S., Davies, K.W. 2012. Differential seedling performance and environmental correlates in shrub canopy vs interspace microsites. Journal of Arid Environments. 87:50-57.
James, J.J., Rinella, M.J., Svejcar, A.J. 2012. Grass seedling demography and sage steppe restoration. Rangeland Ecology and Management. 65(4):409-417.
Madsen, M.D., Petersen, S.L., Fernelius, K.J., Roundy, B.A., Taylor, A.G., Hopkins, B.G. 2012. Influence of soil water repellency on seedling emergence and plant survival in a burned semi-arid woodland. Arid Land Research and Management. 26:236-249.
Boyd, C.S., Svejcar, A.J. 2012. Biomass production and net ecosystem exchange following defoliation in a wet sedge community. Rangeland Ecology and Management. 65(4):394-400.
Davies, K.W., Bates, J.D., Nafus, A. 2012. Comparing burning and mowing treatments in mountain big sagebrush steppe. Environmental Management. 50:451-461.