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Title: Nutrient cycling in a mixed-species plantation of 'Eucalyptus globulus' and 'Acacia mearnsii'
Contributor(s): Forrester, David I (author); Bauhus, Jurgen (author); Cowie, Annette  (author)
Publication Date: 2005
DOI: 10.1139/x05-214
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Abstract: A doubling of aboveground biomass production has been observed in mixtures of 'Eucalyptus globulus' Labill. and 'Acacia mearnsii' de Wildeman when compared with monocultures after 11 years of growth. This study examined to what extent increased nitrogen (N) availability and accelerated rates of nutrient cycling may contribute to increased growth in mixtures. Monocultures of 'E. globulus' (E) and 'A. mearnsii' (A) and mixtures of these species were planted in a species replacement series: 100% E, 75% E + 25% A, 50% E + 50% A, 25% E + 75% A, and 100% A. Litterfall mass increased with aboveground biomass production and was highest in 50:50 mixtures and lowest in monocultures. Owing to higher N concentrations of 'A. mearnsii' litter, N contents of annual litterfall were at least twice as high in stands containing A. mearnsii (32-49 kg·ha¹·year–¹) as in 'E. globulus' monocultures (14 kg·ha¹·year¹). Stands with 'A. mearnsii' also cycled higher quantities of phosphorus (P) in annual litterfall than 'E. globulus' monocultures. This study demonstrated that mixing 'A. mearnsii' with 'E. globulus' increased the quantity and rates of N and P cycled through aboveground litterfall when compared with 'E. globulus' monocultures. Thus, mixed-species plantations appear to be a useful silvicultural system to improve nutrition of eucalypts without fertilization.
Publication Type: Journal Article
Source of Publication: Canadian Journal of Forest Research, 35(12), p. 2942-2950
Publisher: NRC Research Press
Place of Publication: Canada
ISSN: 1208-6037
Field of Research (FOR): 070508 Tree Nutrition and Physiology
070502 Forestry Biomass and Bioproducts
Socio-Economic Outcome Codes: 820101 Hardwood Plantations
820104 Native Forests
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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