Invasive alien plants, land degradation, and restoration
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Presented by Arne Witt for CABI, on the Discussion Forum 13 at the Global Landscapes Forum Nairobi 2018, on 29-30 August in Nairobi, Kenya
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Invasive alien plants, land degradation, and restoration
- 1. KNOWLEDGE FOR LIFEKNOWLEDGE FOR LIFE Global Landscapes Forum (GLF) Invasive alien plants, land degradation, and restoration 29-30 August 2018, Nairobi, Kenya
- 10. KNOWLEDGE FOR LIFE Prosopis juliflora
- 11. KNOWLEDGE FOR LIFE Negative impacts on: Biodiversity; Crop and livestock production; Human and animal health; Water resources; Mobility/access; Tourism Communities have abandoned their land. Invasions also drive conflict between communities as natural resources are depleted
- 12. KNOWLEDGE FOR LIFE Opuntia spp.
- 13. KNOWLEDGE FOR LIFE Negative impacts on: Biodiversity; Livestock production; Human and animal health; Mobility/access; Tourism Drives human-wildlife conflict. Communities have abandoned their land
- 14. KNOWLEDGE FOR LIFE Biological control of O. stricta
- 15. KNOWLEDGE FOR LIFE Lantana camara
- 16. KNOWLEDGE FOR LIFE Negative impacts on: Biodiversity; Crop and livestock production; Human and animal health; Mobility/access; Tourism Communities have abandoned their land
- 17. KNOWLEDGE FOR LIFE “I own more than 10 acres of land but live as if I have only 2 acres. The land has become so small because the bulk of it has been rendered useless by lantana infestations.” Kasasa Godfrey of Kyeyidula village, Kakoge Sub-county, Nakasongola “I have to cut down lantana every three months, if I do not, even my doorstep will be covered in this weed. I am so exhausted, I feel like running away from my land.” Luwoga Christopher of Nakasongola District. Lantana in Uganda – what the community has to say
- 18. KNOWLEDGE FOR LIFE Parthenium hysterophorus
- 19. KNOWLEDGE FOR LIFE Negative impacts on: Biodiversity; Crop and livestock production; Human and animal health; Trade
- 20. KNOWLEDGE FOR LIFE Visit www.invasive-species.org (stories/videos on IAS impacts); www.cabi.org/ISC (most comprehensive and up to date database on IAS); https://www.plantwise.org/KnowledgeBank/home.aspx (more about crop pests, including weeds) Invasive alien plants, land degradation, and restoration
- 21. KNOWLEDGE FOR LIFE So if it’s green, is it necessarily good? Are green ‘deserts’ any better than brown ‘deserts’? “We used to love green colours before prosopis but now we hate it due to the impact prosopis has” (Community member in Eritrea - Bokrezion, 2008) “For me the dry trees are better than a green killer” (Community Member in Eritrea – Bokrezion, 2008)
- 22. KNOWLEDGE FOR LIFE What is an Invasive Alien Species (IAS)? A living organism which has been moved outside of its natural range, as a result of human activities, and established and proliferated to the detriment of biodiversity, human or animal health, crop or pasture production, economic development, etc.
- 23. KNOWLEDGE FOR LIFE Invasive alien plants can have negative impacts on: Biodiversity Crop and pasture production Human and animal health Water resources Hydro-electricity generation Water transport Fishing Tourism Trade Economic development in general They also drive human-wildlife conflict; conflict between people as natural resources are eroded; and can lead to the abandonement of land …… They can also erode traditions and a way of life Their proliferation and spread is also facilitated by poor land-use management. i.e. land degradation drives invasions
- 24. KNOWLEDGE FOR LIFE Invasive alien plants generally grow faster, produce more propagules, and have few to no natural enemies Most of the worst invasive plant spp. are toxic to livestock and wildlife. Once established, they spread, displacing native plant spp. and the organisms associated with them. In croplands they have significant negative impact on yields. THEY ARE BIOLOGICAL POLLUTANTS!!
- 25. KNOWLEDGE FOR LIFE HOWEVER, some invasive plant species also have benefits: Carbon sequestration; Fuelwood; Timber; Ornamental: Food (human and animal); Medicinal; Restoration? That said, do the benefits outweigh the costs?
- 30. KNOWLEDGE FOR LIFE Lantana camara
- 31. KNOWLEDGE FOR LIFE Current and ‘potential’ distribution of Lantana camara in eastern Africa
- 32. KNOWLEDGE FOR LIFE ‘Potential’ distribution of Lantana camara in Africa
- 33. KNOWLEDGE FOR LIFE Chromolaena odorata
- 34. KNOWLEDGE FOR LIFE Current and ‘potential’ distribution of Chromolaena odorata in eastern Africa
- 35. KNOWLEDGE FOR LIFE ‘Potential’ distribution of Chromolaena odorata in Africa
- 36. KNOWLEDGE FOR LIFE Cryptostegia grandiflora
- 37. KNOWLEDGE FOR LIFE Current distribution of Cryptostegia grandiflora in EA and its ‘potential’ distribution in Africa
- 38. KNOWLEDGE FOR LIFE What will happen to natural grazing lands if we don’t manage invasive plants? 71%of natural grazing could be lost (van Wilgen et al., 2008)
- 39. KNOWLEDGE FOR LIFE This is not restoration!!
- 40. KNOWLEDGE FOR LIFE This is restoration!!
- 41. KNOWLEDGE FOR LIFE Visit www.invasive-species.org (stories/videos on IAS impacts); www.cabi.org/ISC (most comprehensive and up to date database on IAS); https://www.plantwise.org/KnowledgeBank/home.aspx (more about crop pests, including weeds) Invasive alien plants, land degradation, and restoration
- 54. KNOWLEDGE FOR LIFE PIENAARS RIVER, CAMDEBOO NATIONAL PARK, JUNE 2013
- 55. KNOWLEDGE FOR LIFE CRITICAL FOR SUCCESS • REMOVE OR REDUCE THE CAUSE OF THE EROSION • CONTROL THE INVASIVE ALIEN PLANTS • SLOW DOWN WATER RUNOFF • INCREASE WATER INFILTRATION • FOLLOW-UP CONTROL OF INVASIVE PLANTS • FOLLOW-UP MAINTENANCE OF EROSION CONTROL STRUCTURES • CONTINUOUS MONITORING OF RESULTS PIENAARS RIVER, CAMDEBOO NATIONAL PARK, JUNE 2014
- 56. KNOWLEDGE FOR LIFE xie-xiezikomo thank youurakoze terima kasih ke itumetse dhanyawaad merci efharistó ﺟزﯾﻼ ﺷﻛرا tak kiitos शुिक्रया ありがとう gracias zikomo danke asante obrigado KNOWLEDGE FOR LIFE Arne Witt: a.witt@cabi.org