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Persistence of Mature Forest Biodiversity Elements in a Production Forest Landscape Managed Under a Regional Forest Agreement

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Persistence of Mature Forest Biodiversity Elements in a Production Forest Landscape Managed Under a Regional Forest Agreement RESOURCES PROJECT NUMBER: PNC142-0809 OCTOBER 2012 Persistence of mature forest biodiversity elements in a production forest landscape managed under a Regional Forest Agreement This report can also be viewed on the FWPA website www.fwpa.com.au FWPA Level 4, 10-16 Queen Street, Melbourne VIC 3000, Australia T +61 (0)3 9927 3200 F +61 (0)3 9927 3288 E [email protected] W www.fwpa.com.au Persistence of mature-forest biodiversity elements in a production-forest landscape managed under a Regional Forest Agreement Prepared for Forest & Wood Products Australia By Tim Wardlaw, Simon Grove, Jayne Balmer, Andrew Hingston, Lynette Forster, Christina Schmuki and Steve Read Publication: Persistence of mature forest biodiversity elements in a production forest landscape managed under a Regional Forest Agreement Project No: PNC142-0809 This work is supported by funding provided to FWPA by the Australian Government Department of Agriculture, Fisheries and Forestry (DAFF). © 2012 Forest & Wood Products Australia Limited. All rights reserved. Whilst all care has been taken to ensure the accuracy of the information contained in this publication, Forest and Wood Products Australia Limited and all persons associated with them (FWPA) as well as any other contributors make no representations or give any warranty regarding the use, suitability, validity, accuracy, completeness, currency or reliability of the information, including any opinion or advice, contained in this publication. To the maximum extent permitted by law, FWPA disclaims all warranties of any kind, whether express or implied, including but not limited to any warranty that the information is up-to-date, complete, true, legally compliant, accurate, non-misleading or suitable. To the maximum extent permitted by law, FWPA excludes all liability in contract, tort (including negligence), or otherwise for any injury, loss or damage whatsoever (whether direct, indirect, special or consequential) arising out of or in connection with use or reliance on this publication (and any information, opinions or advice therein) and whether caused by any errors, defects, omissions or misrepresentations in this publication. Individual requirements may vary from those discussed in this publication and you are advised to check with State authorities to ensure building compliance as well as make your own professional assessment of the relevant applicable laws and Standards. The work is copyright and protected under the terms of the Copyright Act 1968 (Cwth). All material may be reproduced in whole or in part, provided that it is not sold or used for commercial benefit and its source (Forest & Wood Products Australia Limited) is acknowledged and the above disclaimer is included. Reproduction or copying for other purposes, which is strictly reserved only for the owner or licensee of copyright under the Copyright Act, is prohibited without the prior written consent of FWPA. ISBN: 978-1-921763-57-1 Researchers: Wardlaw, T.; Grove, S.; Hingston, A.; Read, S. Forestry Tasmania 79 Melville St. HOBART, Tas. 7000 Balmer, J.; Forster, L. and Schmuki, C. University of Tasmania Churchill Ave, SANDY BAY, Tas. 7005 Final report received by FWPA in October, 2012 Forest & Wood Products Australia Limited Level 4, 10-16 Queen St, Melbourne, Victoria, 3000 T +61 3 9927 3200 F +61 3 9927 3288 E [email protected] W www.fwpa.com.au Executive Summary The study explored a key objective of the biodiversity conservation strategy delivered through Regional Forest Agreements (RFA), which we paraphrase as: forest-dependent species should be able to persist throughout their range, equally in landscapes dominated by production-forests as in landscapes dominated by reserves. We focused on the mature-forest element of biodiversity, because mature forest is more likely to be in short supply in production-forest landscapes than is younger forest. Our assumption is not that production forest must support mature-forest biodiversity in all places at all times, but that any local losses arising through forest harvesting should be temporary, with all areas of native forest at least retaining the potential to regain over time those lost mature-forest species. In this respect, species dynamics after forest harvesting and regeneration can resemble species dynamics after wildfire and forest regrowth. We developed two hypotheses to test the extent to which the RFA is achieving this ‘persistence’ objective. They were: (i) the biodiversity in mature eucalypt forest would be independent of the intensity of disturbance in the surrounding landscape; (ii) that the recolonisation of silvicultural regeneration by mature-forest species would be independent of the intensity of disturbance in the surrounding landscape. We then used the findings from testing these hypotheses to suggest some simple metrics and other planning tools that could guide future management and planning in relation to the spatial and temporal arrangement of mature forest in production-forest landscapes. We tested our hypotheses in the Southern Forests Experimental Forest Landscape (SFEFL) - a 1120 km2 region of predominantly tall, wet eucalypt forest in southern Tasmania. The SFEFL provides a gradient of landscape disturbance-intensity that reflects the patterns of European settlement and developing land-management practices. It manifests in varying ratios of anthropogenic to natural-origin vegetation types when measured across a broad range of spatial scales (in our study, from 500 m to 2 km radius around each sample plot). In the most highly disturbed landscapes, these anthropogenic : natural-origin area ratios were 80%: 20%, while in the least disturbed landscapes, the area ratios were 11% : 89%. Our study did not explicitly compare pre- and post-RFA production forest landscapes. Nonetheless, those parts of the SFEFL with intermediate and low intensity of landscape disturbance represented predominantly post-RFA land-use, while those with high intensity of landscape disturbance represented predominantly pre-RFA land-use. We used plot-based approaches to intensively survey or sample three ecologically diverse focal groups – birds, vascular plants and flighted beetles. Half of our plots were in mature eucalypt forest, the structural attributes of which implied little influence of major disturbance events over the past century or more. The other half were in eucalypt silvicultural regeneration that had arisen from clearfelling 30-50 years previously: we chose forest of this age (i.e. post-canopy closure) because we considered that ecological succession would be advanced enough for such forest to be at least capable of supporting mature-forest species, should they have attempted recolonisation. We established seven replicate 50 x 50 m plots of each forest type in each of four classes of landscape disturbance intensity (56 plots in total). Regarding our first hypothesis, we found that the biodiversity in retained mature forest was indeed largely independent of the intensity of disturbance in the surrounding landscape: all but a small subset of disturbance-sensitive beetles maintained similar populations in mature eucalypt forests in the least disturbed through to the most disturbed parts of the landscape. i The subset of disturbance-sensitive beetles was less species-rich in the most disturbed parts or the SFEFL due to the combined effects of forestry and long-term natural disturbance processes. Regarding our second hypothesis, we found the recolonisation of silvicultural regeneration was not uniform across the disturbance gradient: the abundance and species- richness of three particular sub-sets of our focal groups – dense-forest birds, rainforest plants and disturbance- sensitive beetles –declined as the intensity of landscape disturbance increased. Given these findings, we then explored the relationships between plot-level biodiversity in silvicultural regeneration and the amount (and, indirectly, the configuration) of mature forest in the surrounding landscape. The reductions in abundance and / or species richness evident in dense-forest birds, rainforest plants and disturbance-sensitive beetles were correlated with a decline in the amount of mature eucalypt forest in the surrounding landscape. These correlations were equally strong in small-scale landscapes (125 – 250 m radius around a sample plot) as in large-scale landscapes (4 km radius around a sample plot). These multi- scale correlations could be captured quite effectively by a simple metric – proximity to mature forest. The closer the silvicultural regeneration was to mature forest, the higher was the abundance and / or species richness of these subsets of our three focal groups. Importantly, these proximity relationships showed ‘inverse-threshold’ responses: for plots within a certain (threshold) distance of mature forest, the abundance / richness rapidly increased with decreasing distance to mature forest; for plots beyond that threshold distance, the abundance / richness remained low and unresponsive to changes in distance from mature forest. The threshold distances varied by focal group and unit of measurement: for the cover of rainforest plants and for the species richness of disturbance-sensitive beetles, the threshold distance was about 150 m; for abundance of dense-forest birds, the distance was 400 m; and for the richness of rainforest plants, the threshold was 600 m. Parts of the SFEFL dominated by post-RFA forestry activities currently have sufficient mature eucalypt forest to provide proximity benefit to assist the
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