Aspen-dominated forest response to drought in the Lake States

dc.contributor.advisor Miranda Curzon
dc.contributor.author Schwager, Julia
dc.contributor.department Natural Resource Ecology and Management
dc.date 2021-01-16T18:25:18.000
dc.date.accessioned 2021-02-25T21:39:30Z
dc.date.available 2021-02-25T21:39:30Z
dc.date.copyright Tue Dec 01 00:00:00 UTC 2020
dc.date.embargo 2020-11-30
dc.date.issued 2020-01-01
dc.description.abstract <p>The Long Term Soil Productivity (LTSP) program was founded to examine the effects of soil disturbance, specifically impacts to soil organic matter and soil compaction, on fundamental forest productivity. Both have significant impacts on forest ecosystem function and are heavily influenced by management activities. The LTSP study design includes nine core combinations of organic matter removal and soil compaction. As treatment severity increases, potential net primary productivity is expected to decrease. This study takes place on the LTSP installation in the northern lower peninsula of Michigan, on the Huron National Forest where aspen-birch forest was clear-cut harvested and treated according to LTSP principles in early 1994. Current projections predict warmer temperatures, potentially longer growing seasons, and greater variability in precipitation that together have the potential to increase water stress for tree species, including aspen. The objectives of this study included answering the following questions related to forest response to stress, both anthropogenic and climate-related: 1) How do soil compaction, organic matter removal, and their potential interaction impact stand-level forest growth response to drought in 2012, and 2) how are individual trees responding to drought in 2012 given factors such as size, species, and crowding in addition to treatment effects? Our work showed that there were no stand-scale growth responses to the 2012 drought associated with treatments, but species responses varied. At the individual tree scale, factors such as diameter, species, and crowding were better indicators of drought resistance, resilience, and recovery to drought than treatments. This research has particular value within a landscape that has a long history of management and will likely continue to provide conventional timber products, even as global environmental change introduces new stressors for forests. Additionally, as demand for more sustainable energy sources increases, bioenergy feedstocks may be increasingly sourced from these forests. As a result, aspen stands in the Lake States may be expected to meet greater demand. This could mean more frequent harvest, an increased likelihood of soil compaction, and an increase in the biomass removed if residues are utilized for bioenergy feedstocks or other comparable products, thus understanding the long-term effects of such disturbances on stand growth and response to climate conditions is increasingly important.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/etd/18398/
dc.identifier.articleid 9405
dc.identifier.contextkey 21104851
dc.identifier.doi https://doi.org/10.31274/etd-20210114-133
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath etd/18398
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/94550
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/etd/18398/Schwager_iastate_0097M_19180.pdf|||Fri Jan 14 21:41:13 UTC 2022
dc.subject.keywords LTSP
dc.title Aspen-dominated forest response to drought in the Lake States
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication e87b7b9d-30ea-4978-9fb9-def61b4010ae
thesis.degree.discipline Forestry
thesis.degree.level dissertation
thesis.degree.name Master of Science
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