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Spatial quantification of leafless canopy structure in a boreal birch forest

Lookup NU author(s): Dr Steven Hancock

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Abstract

Leafless deciduous canopies in boreal regions affect the energy available for snowmelt and reduce overall surface albedo during winter, thereby exerting a strong influence on weather and climate. In this work, ground-based measurements of leafless canopy structure, including hemispherical photography, terrestrial laser scanning (TLS) and manual tree surveys were collected at 38 sites in an area of mountain birch forest in northern Sweden in March 2011 and 2012. Photo-derived sky view fraction was strongly inversely correlated (r<-0.9) to the total tree basal area in a 5 m radius around the photo site. To expand findings to wider areas, maps of canopy height for a 5 km x 3 km area were obtained from airborne lidar (ALS) data collected during summer 2005. Canopy heights derived from TLS were used to validate the ALS estimates, and simple models were developed to establish relationships between hemispherical sky view and ALS canopy height (RMSE <5%). The models and ALS data provide useful methods for estimating canopy radiative transfer and biomass over wide areas of birch forest, despite the relatively low ALS resolution (similar to 1 return m(-2)). (C) 2013 Elsevier B.V. All rights reserved.

Publication metadata

Author(s): Reid TD, Spencer M, Huntley B, Hancock S, Essery RLH, Carle J, Holden R, Baxter R, Rutter N

Publication type: Article

Publication status: Published

Journal: Agricultural and Forest Meteorology

Year: 2014

Volume: 188

Pages: 1-12

Print publication date: 14/01/2014

ISSN (print): 0168-1923

ISSN (electronic): 1873-2240

Publisher: Elsevier BV

URL: http://dx.doi.org/10.1016/j.agrformet.2013.12.005

DOI: 10.1016/j.agrformet.2013.12.005

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