Submitted Abstracts - FRSES 2019

Oral presentations     Poster presentations

Oral Presentations:

Abstracts listed alphabetically by author

Oral Presentation Abstracts

EXAMPLE: 6A Bethany Avera
Colorado State University, Graduate.
With Charles Rhoades (USDA Forest Service, Rocky Mountain Research Station), Francisco Calderon (USDA Agriculture Research Service), M. Francesca Cotrufo (Department of Soil and Crop Sciences and the Natural Resource Ecology Laboratory, CSU)

Continent-scale forest disturbance caused by bark beetle outbreaks and associated salvage logging has renewed concern about the implications of forest management on soil organic matter (SOM) stores. The objective of this study was to investigate how salvage logging and residue management influence SOM pools in beetle-infested lodgepole pine (Pinus contorta) forests and to identify dominant sources of soil carbon (C). We quantified the C inventory of downed wood and organic and mineral soils at four sites in Colorado, each with three blocks of the following treatments: (1) uncut beetle-infested forest and, adjacent stands that were logged seven years ago with either residue (2) retention or (3) removal. Soil C inventory increased with salvage logging, but was unrelated to woody residue inputs. For example, soil C was 5.5 Mg ha-1 higher where logging residues were removed compared to where 35 Mg C ha-1 of residues were retained. Increases in soil C were in the light (<1.85 g/cm-3) and sand-sized (> 53 ?m) SOM pools. Differences in ?13C between the organic and mineral soil fractions indicate that C in the mineral soil originates from belowground plant inputs rather than from vertical transfer of C from through decomposition and transformation of soil organic layers. Salvage logging and residue management have multiple consequences for ecosystem processes and biodiversity but our study suggests in lodgepole forests these treatments can increase rather than decrease soil C and that belowground C inputs from residual and newly-established vegetation are crucial to SOM formation.



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Poster Presentations:

Abstracts listed alphabetically by author

Poster Presentation Abstracts

EXAMPLE: Melissa Booher
Colorado State University, Graduate
with Lydia Baldwin (Colorado State University), David J. Cooper (Colorado State University), Evan Wolf (University of California, Davis)

Wet meadows are critically altered and at risk ecosystems in the Sierra Nevada. Disturbance related deficiencies in vegetative cover are a restoration priority due to the importance of organic-rich soils for future plant establishment. This research focuses on biomass accumulation, both above and below ground, associated with planted Carex scopulorum seedlings in Tuolumne Meadows, Yosemite National Park, USA. We are testing the suitability of this species for use in future restoration work and assessing the growth strategy of Carex scopulorum to determine: 1) how does cumulative Carex scopulorum biomass production within a growing season compare to that of other dominant species in the community; 2) does the rate at which Carex scopulorum allocates biomass below ground differ from other dominant species in the community. Carex scopulorum productivity and below/above ground biomass allocation ratio were measured at peak standing biomass using corers in planted, unplanted, and reference areas. Samples were washed to remove all loose soil, biomass was separated by species, then above and below ground biomass was separated. After one year of growth, analyses show that seedlings contribute significantly higher amounts of biomass to study plots than other dominant species in our site. These seedlings allocated a greater proportion of their biomass below ground than most other present species. Our results indicate that after one year of growth, Carex scopulorum appears to be an appropriate species for use in restoring biomass inputs, and could be a valuable tool for restoration of other degraded meadows in the Sierra Nevada.