Residue management effects on soil carbon and nutrient contents and growth of second rotation eucalypts |
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| Affiliation: | 1. Faculty of Forestry, University of Applied Sciences Weihenstephan-Triesdorf, Hans-Carl-von-Carlowitz-Platz 3, 85354, Freising, Germany;2. Forestry Tasmania, GPO Box 207, Hobart, 7001, Tasmania, Australia;1. University of the Sunshine Coast, Locked Bag 4, 4558 Maroochydore, Queensland, Australia;2. University of the Sunshine Coast, Private bag 12, 7001 Hobart, Australia;3. Oregon State University, Department of Forest Engineering, Resources and Management, Snell Hall 205, 97331-5706 Corvallis, OR, USA;4. School of Forestry and Wildlife Sciences, 3425 Forestry and Wildlife Sciences Building Auburn University, AL 36849-5418, USA;5. University of Natural Resources and Life Sciences Vienna, Department of Forest and Soil Sciences, Institute of Forest Engineering, Peter Jordan Strasse 82/3, 1190 Vienna, Austria;6. CNR IVALSA, Via Madonna del Piano 10, I 50019 Sesto Fiorentino, FI, Italy;7. University of Canterbury, College of Engineering, School of Forestry, Private Bag 4800, Christchurch, New Zealand;8. University College Dublin, School of Biosystems Engineering, Agriculture and Food Science, Belfield, Dublin 4, Ireland;9. Skogforsk, Uppsala Science Park, SE-751 83 Uppsala, Sweden;10. Natural resources institute Finland (Luke), Yliopistokatu 6, FI-80100 Joensuu, Finland;11. Technic University of Madrid, Spain;12. Skogforsk Uppsala Science Park, SE-751 83 Uppsala, Sweden;13. Swedish University of Agricultural Sciences, Department of Forest Ecology and Management, SE-901 83 Umeå, Sweden;1. ARC Training Centre for Forest Value, School of Natural Sciences, University of Tasmania, Locked Bag 55, Hobart, Tas. 7001, Australia;2. Biological Sciences, School of Natural Sciences, University of Tasmania, Locked Bag 55, Hobart, Tas. 7001, Australia;3. CSIRO Ecosystem Sciences, Private Bag 12, Hobart, Tas. 7001, Australia;4. College of Science and Engineering, University of Tasmania, Locked Bag 1370, Launceston, Tas. 7250, Australia |
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| Abstract: | We examined tree growth and dynamics of organic matter and soil nutrient pools annually for 7 years under contrasting harvest residue management treatments in south-western Australia. Two second rotation Eucalyptus globulus sites were established on soils of contrasting fertility and productivity. Harvest residues were either (i) burnt, (ii) removed, (iii) retained, or (iv) retained at double the normal quantity. More than 31 and 51 Mg ha−1 of harvest residues resulted from harvesting of 8-year-old first rotation stands at a low fertility Grey Sand site, and a higher fertility Red Earth site, respectively. Harvest residue retention increased tree growth at the lower fertility Grey Sand site, but had no effect on plantation productivity at the Red Earth site up to 7 years. Burning resulted in a direct loss of most of the organic material, and up to 200, and 350 kg ha−1 of N at the Grey Sand and Red Earth sites, respectively. Significant quantities of organic material in harvest residues (>50 Mg ha−1 C in the double residues treatment at the Red Earth site) had a limited effect on soil C pools during the 7 years of this study. Retention of residues limited immediate losses of nutrients, and resulted in higher quantities of soil exchangeable K, Ca and Mg during the 7 years after establishment. However, the content of soil exchangeable cations, especially K, decreased during the first 4 years of establishment in all treatments, including those where residues were retained. After 4 years, cation quantities in soil started to increase again, probably due to the decomposition of leaves and twigs from litterfall. |
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