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Land clearance not dieback continues to drive tree loss in a Tasmanian rural landscape

Citation

Prior, LD and Sanders, GJ and Bridle, KL and Nichols, SC and Harris, R and Bowman, DMJS, Land clearance not dieback continues to drive tree loss in a Tasmanian rural landscape, Regional Environmental Change, 13, (5) pp. 955-967. ISSN 1436-3798 (2013) [Refereed Article]

Copyright Statement

Copyright 2013 Springer-Verlag Berlin Heidelberg

DOI: doi:10.1007/s10113-012-0396-0

Abstract

Tree cover has declined markedly since European settlement in the agricultural areas of Australia due to land clearing and natural and stress-induced senescence of remnant trees combined with widespread regeneration failure. These decreases in tree cover have seldom been quantified on a landscape scale, but are important in understanding losses in carbon storage and biodiversity across large areas of the continent. We used historical aerial photography and satellite imagery to study changes in tree canopy cover in the southern Tasmanian Midlands, one of the oldest agricultural regions in Australia. Tree cover at 1,000 random sites was assessed from imagery captured on four occasions between 1947 and 2010. Tree cover was stable between 1947 and the 1970s, but decreased from 33 % in the 1970s to 21 % in 2010. The decrease appeared driven by transition from some cover to no cover, rather than from more cover to less cover, because sites with tree cover in 2010 showed little net change during the study period. Statistical modelling showed soils derived from igneous rocks lost more cover than did the less fertile sedimentary soils, and contrary to the expectations, if drought was the cause of cover loss, sun-exposed north-facing sites did not lose more cover than south-facing ones. We argue that these temporal and spatial patterns of tree cover change are consistent with tree clearing rather than loss of remnant isolated trees due to drought-induced dieback.

Item Details

Item Type:Refereed Article
Keywords:tree canopy cover, remnant woodlands, rural tree decline, tree regeneration, temperate savanna, Tasmania
Research Division:Agricultural and Veterinary Sciences
Research Group:Forestry Sciences
Research Field:Forestry Management and Environment
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Native Forests
Author:Prior, LD (Dr Lynda Prior)
Author:Sanders, GJ (Mr Gregor Sanders)
Author:Bridle, KL (Dr Kerry Bridle)
Author:Nichols, SC (Mr Scott Nichols)
Author:Harris, R (Mr Rowan Harris)
Author:Bowman, DMJS (Professor David Bowman)
ID Code:87846
Year Published:2013
Web of Science® Times Cited:7
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2013-12-11
Last Modified:2017-11-02
Downloads:1 View Download Statistics

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