A decision-making framework for restoring riparian zones degraded by invasive alien plants in South Africa

 

Show simple item record

dc.contributor.author Holmes, P M
dc.contributor.author Richardson, D M
dc.contributor.author Esler, K J
dc.contributor.author Witkowski, E T F
dc.contributor.author Fourie, S
dc.date.accessioned 2017-03-30T12:41:02Z
dc.date.available 2017-03-30T12:41:02Z
dc.date.issued 2005
dc.identifier.citation Holmes, P. M., Richardson, D. M., Esler, K. J., Witkowski, E. T. F., & Fourie, S. (2005). A decision-making framework for restoring riparian zones degraded by invasive alien plants in South Africa: review article. South African Journal of Science, 101(11 & 12), p-553.
dc.identifier.uri http://hdl.handle.net/11427/24115
dc.description.abstract Riparian habitats in many parts of South Africa are severely degraded by invasive alien plants, especially trees. These invasions reduce water yields from catchments and affect riverine functioning and biodiversity. Initiatives are under way countrywide to clear alien plants from watercourses and surrounding catchments. Current understanding of key processes that regulate riparian functioning and define options for restoration is rudimentary. We review the impacts of riparian invasions and identify factors limiting the recovery of natural vegetation following alien clearance. We propose a framework of strategic interventions for optimizing restoration success. The framework identifies abiotic and biotic barriers to restoration at the scales of catchments and local reaches. In highly transformed catchments, interventions at the reach scale may fail if important barriers at the catchment scale are not addressed. The extent to which propagule supply and microsite conditions inhibit vegetation recovery is unknown. We also know little of the relative importance of dispersing vegetative propagules, dispersing seeds and soil-stored seed banks in vegetation dynamics, particularly after severe disturbances such as dense invasion by alien plants. The importance of geomorphological and hydrological factors in mediating recovery of riparian vegetation has not been adequately explored for all climatic areas in South Africa. More research is needed to determine the influence of different alien species and clearing treatments on the recovery of riparian vegetation. The literature strongly suggests that in highly alien-transformed catchments, the re-introduction of riparian species is required to promote recovery and suppress re-invasion. However, such interventions are unlikely to be widely implemented unless the cost: benefit ratios are favourable.
dc.language.iso eng
dc.source South African Journal of Science
dc.source South African Journal of Science
dc.source.uri http://www.sajs.co.za/
dc.title A decision-making framework for restoring riparian zones degraded by invasive alien plants in South Africa
dc.type Journal Article
dc.date.updated 2016-01-04T10:16:27Z
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Department of Biological Sciences en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Holmes, P. M., Richardson, D. M., Esler, K. J., Witkowski, E. T. F., & Fourie, S. (2005). A decision-making framework for restoring riparian zones degraded by invasive alien plants in South Africa. <i>South African Journal of Science</i>, http://hdl.handle.net/11427/24115 en_ZA
dc.identifier.chicagocitation Holmes, P M, D M Richardson, K J Esler, E T F Witkowski, and S Fourie "A decision-making framework for restoring riparian zones degraded by invasive alien plants in South Africa." <i>South African Journal of Science</i> (2005) http://hdl.handle.net/11427/24115 en_ZA
dc.identifier.vancouvercitation Holmes PM, Richardson DM, Esler KJ, Witkowski ETF, Fourie S. A decision-making framework for restoring riparian zones degraded by invasive alien plants in South Africa. South African Journal of Science. 2005; http://hdl.handle.net/11427/24115. en_ZA
dc.identifier.ris TY - AU - Holmes, P M AU - Richardson, D M AU - Esler, K J AU - Witkowski, E T F AU - Fourie, S AB - Riparian habitats in many parts of South Africa are severely degraded by invasive alien plants, especially trees. These invasions reduce water yields from catchments and affect riverine functioning and biodiversity. Initiatives are under way countrywide to clear alien plants from watercourses and surrounding catchments. Current understanding of key processes that regulate riparian functioning and define options for restoration is rudimentary. We review the impacts of riparian invasions and identify factors limiting the recovery of natural vegetation following alien clearance. We propose a framework of strategic interventions for optimizing restoration success. The framework identifies abiotic and biotic barriers to restoration at the scales of catchments and local reaches. In highly transformed catchments, interventions at the reach scale may fail if important barriers at the catchment scale are not addressed. The extent to which propagule supply and microsite conditions inhibit vegetation recovery is unknown. We also know little of the relative importance of dispersing vegetative propagules, dispersing seeds and soil-stored seed banks in vegetation dynamics, particularly after severe disturbances such as dense invasion by alien plants. The importance of geomorphological and hydrological factors in mediating recovery of riparian vegetation has not been adequately explored for all climatic areas in South Africa. More research is needed to determine the influence of different alien species and clearing treatments on the recovery of riparian vegetation. The literature strongly suggests that in highly alien-transformed catchments, the re-introduction of riparian species is required to promote recovery and suppress re-invasion. However, such interventions are unlikely to be widely implemented unless the cost: benefit ratios are favourable. DA - 2005 DB - OpenUCT DP - University of Cape Town J1 - South African Journal of Science LK - https://open.uct.ac.za PB - University of Cape Town PY - 2005 T1 - A decision-making framework for restoring riparian zones degraded by invasive alien plants in South Africa TI - A decision-making framework for restoring riparian zones degraded by invasive alien plants in South Africa UR - http://hdl.handle.net/11427/24115 ER - en_ZA


Files in this item

This item appears in the following Collection(s)

Show simple item record