Effects of establishment silviculture on carbon and nitrogen isotope compositions and tree growth in a F1 hybrid pine plantation of southeast Queensland

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Title Effects of establishment silviculture on carbon and nitrogen isotope compositions and tree growth in a F1 hybrid pine plantation of southeast Queensland
Author Ibell, Paula Therese; Xu, Zhihong; Blumfield, Timothy John; Nester, M.; Bubb, K.
Publication Title Linking Local Management to Global Change Challenges: The Proceedings of the International Symposium on Forest Soils and Ecosystem Health
Editor Zhihong Xu, Chris E Johnson, Chengrong Chen, Timothy J Blumfield
Year Published 2007
Place of publication Griffith University, Brisbane
Publisher Centre for Forestry and Horticultural Research
Abstract TThe effects of routine and luxury weed control and fertilization treatments on diameter, height, carbon (δ13C) and nitrogen (δ15N) isotope composition in foliage were assessed in an 8-year-old, F1 hybrid pine (Pinus elliottii var. elliottii Pinus caribaea var. hondurensis) plantation, on typical sandy soils in southeast Queensland. The aim of this research was to identify how weed control and fertilization treatments affect nitrogen nutrition and water use in F1 hybrid pine plantations, together with tree growth. The results have indicated that a lack of weed competition has shown greater potential for height and diameter at breast height (Dbh) increment and δ15N in the foliage. A strong correlation between growth and δ15N existed for all canopy positions, demonstrating that foliar δ15N may prove to be a better indicator of growth indices in the canopy than total foliar N concentrations alone. These differences could be in part due to discrimination against 15N by soil micro-fauna, during the processes of decomposition and mineralization and as a result of leaching of lighter 14N, where no weed cover exists. These results indicate that in an 8-year-old F1 hybrid pine plantation, luxury weed control treatments significantly affected foliar δ15N, but not foliar δ13C, nor foliar N or C concentrations. It is therefore concluded that luxury weed control treatments result in both greater height and Dbh increment and an increased pool of 15N abundance available for tree uptake as reflected in the foliage of 8-year-old F1 hybrid pine trees at this site
Peer Reviewed Yes
Published Yes
Publisher URI http://www.griffith.edu.au/conference/isfs2007/
Copyright Statement Copyright remains with the authors 2007. The attached file is posted here with permission of the copyright owners for your personal use only. No further distribution permitted. For information about this conference please refer to the publisher's website or contact the authors.
ISBN 9781921291166
Conference name ISFS 2007
Location Queensland, Australia
Date From 2007-08-19
Date To 2007-08-23
URI http://hdl.handle.net/10072/17975
Date Accessioned 2008-03-06
Language en_AU
Research Centre Environmental Futures Research Institute
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Management and Environment
Publication Type Conference Publications (Full Written Paper - Refereed)
Publication Type Code e1

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