Causes of Recruitment Limitation at Abrupt Alpine Treelines
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Date
Authors
Doeweler, Fabian
Supervisor
Case, Bradley S.
Buckley, Hannah L.
Bader, Martin
Item type
Thesis
Degree name
Doctor of Philosophy
Journal Title
Journal ISSN
Volume Title
Publisher
Auckland University of Technology
Abstract
At the abrupt ecotone between the upper limit of southern beech forests in New Zealand and adjacent subalpine vegetation, ecological processes such as competition/facilitation, and species’ tolerances to alpine conditions, maintain a dynamic balance between these two contrasting plant communities. While other treeline ecotones globally have responded to ongoing climatic changes there is little evidence that the position and form of the beech-subalpine ecotone has undergone similar changes over the past decades. Further, it is unknown when the beech forest-subalpine ecotone will respond to such changes in the future. Critical to predicting change is understanding the abiotic and biotic factors that limit recruitment of individual trees above the treeline. To address this, this thesis research aimed to further elucidate the role of subalpine microhabitat variability in controlling forest regeneration patterns in abrupt treeline ecotones.Description
Keywords
New Zealand, Treeline, Alpine research, Seedling, Fuscospora cliffortioides, Mountain beech, Climate change, UAV, Drone, Remote sensing, Plant physiology, Ecological modelling, Geospatial, Forest ecosystem, Photogrammetry, Image classification, LiDAR, Microhabitat, Seedling recruitment, Photoinhibition, Competition, Facilitation, Stress gradient, Southern Alps, Thermal imagery, Chlorophyll fluorescence, Tussock, Seedling regeneration, Ecosystem migration, Global warming, Microclimate