6544 28 archive 282 disk0/00/00/65/44 2008-06-03 12:07:58 2008-09-03 06:50:23 2008-07-16 17:26:32 article show B.M.Potts@utas.edu.au Williams DR dean.williams@forestrytas.com.au Potts BM B.M.Potts@utas.edu.au Neilsen WA Joyce K Kelsey.Joyce@gunns.com.au pub 300602 820101 620303 restricted Eucalyptus nitens, flowering, planting density, spacing, reproductive output, wildlings, genetic contamination BM Potts. The effect of spacing on the production of flowers and capsules in Eucalyptus nitens was studied in two spacing trials located in northern Tasmania. Tree density in these trials ranged from 468 to 4216 stems per hectare. Reproductive structures were collected in litter traps and these data used to calculate reproductive output on a per tree and per hectare basis. Between 8,735 (5-year old site, 1333 stems ha-1 ) to 234,098 (13-year old site, 1082 stems ha-1) flowers were produced per hectare over a single flowering season at these two study sites at the planting densities expected of a pulpwood plantation. This represented 8 and 211 flowers per tree respectively. As tree density decreased the production of flowers and capsules increased on both a per tree and per hectare basis. It is estimated that the number of flowers per hectare is likely to be any where between between 1.4 and 10 fold greater under the spacing expected in saw-log regimes (250 trees ha-1). This difference in reproductive output between plantations of E. nitens that use different spacing regimes is one of the many factors that need to be considered in assessing the risk of wilding establishment or hybridisation with adjacent native eucalypts. 2006-12 published Australian Forestry 69 4 299-304 TRUE 0004-9158 http://www.forestry.org.au/ifa/c/c3-ifa.asp?ID=1669 Anon. (1997). 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Distribution, biology, genetics, and improvement programs for Eucalyptus globulus and E. nitens around the world. In Proceedings of the 24th Biennial Southern Tree Improvement Conference, June 9-12 1997, (Eds, T. White, D. Huber and G. Powell). pp. 81-95. (Southern Tree Improvement Committee, Orlando, Florida). Vertessy, R.A. (1999). The impacts of forestry on streamflows: A review. In: Forest Management for water quality and quantity. Proceedings of the 2nd Forest Errosion Workshop, May 1999. Report 99/6, (Eds. J. Croke and P. Lane). pp. 93-109. (CRC for Catchment Hydrology, Melbourne). Vertessy, R.A. and Bessard, Y. (1999). Anticipating the negative hydrologic effects of plantation expansion: Results from a GIS-based analysis on the Murrumbidgee basin. In: Forest Management for water quality and quantity. Proceedings of the 2nd Forest Errosion Workshop, May 1999. Report 99/6, (Eds. J. Croke and P. Lane). pp 69-73. (CRC for Catchment Hydrology, Melbourne). Wang, W.J., Smethurst, P.J. and Holz, G.K. (1998). Nitrogen fluxes in surface soils of 1-2-year-old eucalypt plantations in Tasmania. Australian Journal of Soil Research 36: 17-29. White, D.A., Beadle, C.L., Battaglia, M., Benyon, R.G., Dinin, F.X. and Medhurst, J.L. (2001). A physiological basis for management of water use by tree crops. In Plantations, Farm Forestry and water: Workshop Proceedings Publication No. 01/20 (Eds. E.K.S. Nambiar and A. G. Brown). pp 20 – 27. (Rural Industries Research and Development Corporation Barton, ACT). Williams, D. (1999). Flowering and seed production in Eucalyptus nitens. Unpublished Ph.D. Thesis, University of Tasmania. Williams, D.R., Potts, B.M. and Smethurst, P.J. (2003). Promotion of flowering in Eucalyptus nitens by paclobutrazol was enhanced by nitrogen fertilizer. Canadian Journal of Forest Research 33: 74-81. Wood, M.S., Stephens, N.C., Allison, B.K. and Howell, C.I. (2001). ‘Plantations of Australia - A Report from the National Plantation Inventory and the National Farm Forest Inventory.’ (Bureau of Rural Sciences: Canberra). 5388 6 6544 1 application/pdf en staffonly cc_utas

Williams_et_al_Aust_For_spacing_paper.pdf

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