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Soil and vegetation response to thinning White Cypress Pine (Callitris glaucophylla) on the North Western Slopes of New South Wales, Australia

journal contribution
posted on 06.12.2017, 00:00 by Melinda MchenryMelinda Mchenry, B Wilson, J Lemon, D Donnelly, I Growns
Dense White Cypress Pine (Callitris glaucophylla J. Thompson and L.A.S. Johnson) regrowth occurs frequently across previously cleared landscapes in New South Wales (NSW), and is thought to adversely affect agricultural production and to cause land degradation. The NSW Native Vegetation Act (2003) requires that management of native vegetation including pre-1990 regrowth must ‘improve or maintain’ site condition, yet there is currently limited information regarding techniques for the optimum management of C. glaucophylla in this regard. We conducted a preliminary study to examine floristic omposition, soil condition (to 50 cm) and carbonstorage under ‘Dense’ (dense regrowth), ‘Thinned’ (Dense regrowth thinned 2000/2001) and Un-colonised’ (pasture not yet recolonised by C. glaucophylla) plots on private lands in NSW. Reduced tree density from thinning resulted in increased biomass of the remaining individual trees. Un-colonised plots had significantly more groundcover than thinned plots, which had significantly more groundcover than dense plots. Differences in plant diversity however, were explained by site factors rather than land use. Soils in the dense plots were the most acid but soil pH was significantly higher in thinned plots and pH was highest in soil of the un-colonised plots. Mean values for carbon, nitrogen, sulphur and extractable phosphorus varied among sites, although each were significantly more abundant in the mineral soil of dense and thinned plots compared with un-colonised plots, suggesting that thinning had had a minimal effect on the soil parameters assessed. Accounting for all site components, site carbon storage was significantly higher in dense and thinned plots compared with un-colonised plots due to elevated levels of soil and litter carbon as well as the presence of trees. The results indicate that thinning dense C. glaucophylla canmaintain and (by some measures) improve site condition. However, given the variability in some of the parameters assessed, further study across a wider range of soil types and rainfall gradients isproposed.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Volume

285

Start Page

245

End Page

255

Number of Pages

11

eISSN

1573-5036

ISSN

0032-079X

Location

Netherlands

Publisher

Springer Netherlands

Language

en-aus

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

Dept. of Natural Resources; University of New England, Australia;

Era Eligible

Yes

Journal

Plant and soil.

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