Author ORCID Identifier

0000-0002-2919-2363

Defense Date

2022

Document Type

Thesis

Degree Name

Master of Science

Department

Biology

First Advisor

Christopher Gough

Abstract

The capacity of forests to resist structural change and retain material legacies–the biotic and abiotic resources that persist through disturbance–is crucial to sustaining ecosystem functioning after disturbance. However, the role of forest structure as both a material legacy and feature supporting carbon (C) cycling stability following disturbance has not been widely investigated. We used a large-scale disturbance manipulation to ask whether LiDAR-derived canopy structures as material legacies drive 3-year responses of NPP to a range of disturbance severity levels. As part of the Forest Resilience Threshold Experiment (FoRTE) in northern Michigan, USA we simulated phloem-disrupting disturbances at a range of severities and two disturbance types. We quantified the legacies of forest structure using two approaches: one measured change in structure and primary production from pre- to post-disturbance and the second estimated resistance as log transformed ratios of control and treatment values. We found that total aboveground wood net primary production (ANPPw) remained similar across disturbance severities as remnant trees rapidly increased rates of primary production. Experiment-wide, disturbance had limited effects on change in mean structural complexity values; however, high variance underscored large differences in the magnitude and direction of complexity’s response at the plot-scale. Plot-scale structural complexity, but not VAI, resistance strongly predicted ANPPw resistance while temporal VAI and structural complexity changes did not. We conclude that the presence of material legacies in the form of forest structure may affect primary production stability following disturbance, and that how legacies are quantified may affect the interpretation of disturbance response.

Rights

© The Author

Is Part Of

VCU University Archives

Is Part Of

VCU Theses and Dissertations

Date of Submission

5-6-2022

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