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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/6096

Title: Three centuries of managing introduced conifers in South Africa: benefits, impacts, changing perceptions and conflict resolution
Authors: Van Wilgen, BW
Richardson, DM
Keywords: Conifers
Pine trees
Water usage
Environmental management
Biological invasions
Issue Date: May-2012
Publisher: Elsevier
Citation: Van Wilgen, BW and Richardson, DM. 2012. Three centuries of managing introduced conifers in South Africa: benefits, impacts, changing perceptions and conflict resolution. Journal of Environmental Management, vol. 106, pp 56-68
Series/Report no.: Workflow;9036
Abstract: Alien conifers, mainly pines, have been planted in South Africa for a range of purposes for over 300 years. Formal plantations cover 660 000 ha of the country, and invasive stands of varying density occur on a further 2.9 million ha. These trees have brought many benefits but have also caused unintended problems. The management of alien conifers has evolved in response to emerging problems such as excessive water use by plantations of conifers, changing values and markets, and the realities of a new ecological order brought about by invasive alien conifers. This paper reviews the history of conifer introductions to South Africa, the benefits and impacts with which they are associated, and the ongoing and evolving research that has been conducted to inform their management. The South African approach has included taking courageous steps to address the problem of highly invasive species that are also an important commercial crop. These interventions have not, however, had the desired effect of both retaining benefits from formal plantations while simultaneously reversing the trend of growing impacts associated with self-sown invasive stands. We suggest that different approaches need to be considered, including the systematic phasing out of commercial forestry in zones where it delivers low returns, and the introduction of more effective, focussed and integrated, region-specific approaches to the management of invasive stands of conifers. These steps would deliver much improved economic outcomes by protecting valuable ecosystem services, but will require political commitment to policies that could be unpopular in certain sectors of society.
Description: Copyright: 2012 Elsevier. This is an ABSTRACT ONLY.
URI: http://www.sciencedirect.com/science/article/pii/S0301479712001776
ISSN: 0301-4797
Appears in Collections:Water resources and human health
Forestry and wood science
Ecosystems processes & dynamics
General science, engineering & technology

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