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German wasp | Vespula germanica

German wasp

Vespula germanica

Coral bush | Ardisia crenata

Coral bush

Ardisia crenata

Purple loosestrife | Lythrum salicaria

Purple loosestrife

Lythrum salicaria

Pom pom weed | Campuloclinium macrocephalum

Pom pom weed

Campuloclinium macrocephalum

Canarybird bush | Crotalaria agatiflora

Canarybird bush

Crotalaria agatiflora

Peanut butter cassia | Senna didymobotrya

Peanut butter cassia

Senna didymobotrya

Rubber vine | Cryptostegia grandiflora

Rubber vine

Cryptostegia grandiflora

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Environmental Programmes

In order to tackle our country’s socio-economic challenges, the government adopted the Outcomes based approach to improve government performance and providing focus on service delivery. find out more

Invasive alien plants and water resources in South Africa: advances in understanding and predictive ability since 2004 and research challenges

Invasive alien plants and water resources in South Africa: advances in understanding and predictive ability since 2004 and research challenges
David C. Le Maitre1,2, Mark B Gush1,Sebinasi Dzikiti1
1Natural Resources and the Environment, CSIR, Stellenbosch
2Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University

A key motivation for initiating of the Working for Water programme in 1995 was predictions that invasive alien plants would use significant amounts of water and that clearing invasions would protect water resources. These predictions were based on the results of hydrological experiments on the impacts of commercial tree plantations on water resources and the estimates of the biomass present in invaded areas. During the past 20 years there has been significant progress in the understanding of biophysical processes and the factors that control vegetation and plant water-use, as well as datasets that enable comparisons between indigenous and alien plant species. These include the development, and ongoing improvement in, methods of measuring transpiration and evaporation at levels from the individual plants to stands of plants using sap flow and micro-meteorological techniques. The development and of remote-sensing-based methods of estimating evaporation opens up new approaches to scaling-up invasive tree water use from the site or small catchment level measurements to large catchments and even regions of South Africa. Challenges remain, including adequate data some major invaders, and robust methods for modelling the impacts of invasions on water yields. We require more long-term catchment-based studies of invasions and their control on the water balance. Knowledge of their impacts has not been effectively integrated into catchment management practices and water resource planning, or into funding for catchment management. These knowledge gaps and failures in translating knowledge into action should be given a high priority in research and in knowledge transfer. 

Read 2858 times Last modified on Tuesday, 03 May 2016 12:24

General News Updates

2019 National Symposium on Biological Invasio…

26-02-2019

This is your invitation to South Africa's 2019 National Symposium on Biological Invasions. The convention is hosted by the Centre for Invasion Biology (CIB), University of Stellenbosch, and the Biolo... Read more

2019 Invasive Species Training

22-01-2019

During the past five years (2014-2018), ISSA invasive species trainers have trained 4 000 in the identification of invasive species and laws pertaining to invasive species across South Africa.  ... Read more

Alien Grass Working Group

04-09-2018

Who are we? The South African National Alien Grass Working Group was jointly initiated by the South African Biodiversity Institute (SANBI) and the Centre for Excellence in Invasion Biology (C·I·B) in... Read more

Permits for planting indigenous Cynodon?

01-03-2018

On 16 February, 2018, South Africa's Department of Environmental Affairs issued amendments to the regulations and lists relating to the National List of Invasive Species.  Updates to the draft&n... Read more

Invasive species training 2018 dates released

28-02-2018

Interested in invasive species?  How much do you know about NEMBA invasive species compliance for landowners and organs of state? The South African Green Industries Council (SAGIC) have released... Read more

Communications post for Africa advertised

25-01-2018

The Nature Conservancy has advertised a brand new post:  Communications Manager, Africa Region. Knowledge of invasive species and water would be an asset in this post. See details below:    Job Titl... Read more