Title:

Long-term effects of restoration treatments in a juniper woodland invaded by annual exotic grasses: juniper removal, pile burning and native seeding

Author(s):

Day, Michelle A.; Kerns, Becky K.

Publication Year:

2020

How to Cite:

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Day, Michelle A.; Kerns, Becky K. 2020. Long-term effects of restoration treatments in a juniper woodland invaded by annual exotic grasses: juniper removal, pile burning and native seeding. Fort Collins, CO: Forest Service Research Data Archive. https://doi.org/10.2737/RDS-2020-0032

Abstract:

These data document understory vegetation cover and juniper overstory cover for a juniper removal study with unthinned controls on the Crooked River National Grassland in central Oregon, USA. Juniper removal was conducted in 2008-2010, slash was piled and burned, and piles and skid trails were later seeded with two different seed mixes. Both plot- and transect-level data were measured. Plot data include understory vegetation cover by vascular species measured with randomly placed 1-meter (m) plots in two different experiments of disturbance type: 1) slash piles, and 2) skid trails, followed by three native seeding treatments 1) cultivar, 2) local sources, and 3) no seed. Both seed mixes contained western yarrow (Achillea millefolium), bottlebrush squirreltail (Elymus elymoides) and bluebunch wheatgrass (Pseudoroegneria spicata). Plots were measured prior to juniper removal in 2008 in the slash pile disturbance experiment, and then following treatment in both the slash pile and skid trail disturbance experiments in 2010, 2011, 2013 and 2017. Plot measurements include ground cover by type, plant cover by species, and juniper basal area. For transect data, understory vegetation cover by vascular species and juniper overstory were measured with systematically placed line-point transects across the landscape for a nine year period - prior to thinning in 2008, and then in 2013 and 2017, three and seven years post-treatment, respectively. Transect measurements include ground cover by type, plant cover by species, and juniper density (high or low).

Keywords:

biota; Ecology, Ecosystems, & Environment; Plant ecology; Fire; Wildland/urban interface; Forest & Plant Health; Invasive species; Natural Resource Management & Use; Restoration; exotic annual grass; juniper encroachment; Juniperus occidentalis; thinning; JFSP; Joint Fire Science Program; Oregon; Crooked River National Grassland

Related publications:

• Day, Michelle A.; Kerns, Becky K. 2014. Fuel reduction, seeding, and vegetation in a juniper woodland. Rangeland Ecology & Management. 67(6): 667-679. https://doi.org/10.2111/rem-d-13-00149.1

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