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Effects of deer on woodland structure revealed through terrestrial laser scanning

Eichhorn, Markus P.; Ryding, Joseph; Smith, Martin J.; Gil, Robin M.A.; Siriwardena, Gavin M.; Fuller, Robert J.

Authors

Markus P. Eichhorn

Joseph Ryding

Martin J. Smith

Robin M.A. Gil

Gavin M. Siriwardena

Robert J. Fuller



Abstract

1. Terrestrial laser scanning (TLS) captures the three-dimensional structure of habitats. Compared to traditional methods of forest mensuration, it allows quantification of structure at increased resolution, and the derivation of novel metrics with which to inform ecological studies and habitat management.
2. Lowland woodlands in the UK have altered in structure over the last century due to increased abundance of deer and a decline in management. We compared whole-canopy profiles between woodlands with high (>10 deer km−2) and low deer density (c. 1 deer km−2), and in stands with and without records of management interventions in the last 20 years, providing a test case for the application of TLS in habitat assessment for conservation and management.
3. Forty closed-canopy lowland woodlands (height range 16·5–29·4 m) were surveyed using TLS in two regions of the UK, divided into areas of high- and low-deer abundance, and between plots which had been recently managed or were unmanaged. Three-dimensional reconstructions of the woodlands were created to document the density of foliage and stem material across the entire vertical span of the canopy.
4. There was a 68% lower density of understorey foliage (0·5–2 m above-ground) in high-deer woodlands, consistent in both regions. Despite this, total amounts of foliage detected across the full canopy did not differ between deer density levels. High-deer sites were 5 m taller overall and differed in the distribution of foliage across their vertical profile. Managed woodlands, in contrast, exhibited relatively minor differences from controls, including a lower quantity of stem material at heights from 2 to 5 m, but no difference in foliage density. All main effects were replicated equally in both regions despite notable differences in stand structures between them.
5. Synthesis and applications. Terrestrial laser scanning allows ecologists to move beyond two-dimensional measures of vegetation structure and quantify patterns across complex, heterogeneous, three-dimensional habitats. Our findings suggest that reduction of deer populations is likely to have a strong impact on woodland structures and aid in restoring the complex understorey habitats required by many birds, whereas management interventions as currently practiced have limited and inconsistent effects.

Journal Article Type Article
Publication Date Nov 15, 2017
Journal Journal of Applied Ecology
Print ISSN 0021-8901
Electronic ISSN 1365-2664
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 54
Issue 6
APA6 Citation Eichhorn, M. P., Ryding, J., Smith, M. J., Gil, R. M., Siriwardena, G. M., & Fuller, R. J. (2017). Effects of deer on woodland structure revealed through terrestrial laser scanning. Journal of Applied Ecology, 54(6), doi:10.1111/1365-2664.12902
DOI https://doi.org/10.1111/1365-2664.12902
Keywords Deer browsing; foliage profile; forest canopy; forest management; forest structure; forest understorey; LiDAR; oak; woodland management
Publisher URL http://onlinelibrary.wiley.com/doi/10.1111/1365-2664.12902/abstract?
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information This is the peer reviewed version of the following article: Eichhorn, M.P., Ryding, J., Smith, M.J., Gill, R.M.A., Siriwardena, G.M. and Fuller, R.J. (2017), Effects of deer on woodland structure revealed through terrestrial laser scanning. J Appl Ecol., which has been published in final form at doi:10.1111/1365-2664.12902. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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