Typha control efficiency of a weed-cutting boat in the Lac de Guiers in Senegal: a preliminary study on mowing speed and re-growth capacity

Hellsten, Seppo; Dieme, Charles; Mbengue, Marthe; Janauer, Georg A.; Hollander, Nick den; Pieterse, A.H.

doi:10.1007/978-94-017-0922-4_35

Cited by 8 publications

(8 citation statements)

References 3 publications

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“…(Husa´k 1978;Singh et al 1976). This is probably because, at that moment, the carbohydrate reserve in the rhizome was limited (Hellsten et al 1999). In contrast, cutting shoots in the low-flowering shoot zone (LF zone) reduced the below-ground biomass by 28%.…”

Section: Discussionmentioning

confidence: 97%

“…Even a single cutting of underwater parts during the flowering period succeeded in decreasing the biomass of T. angustata in India (Singh et al 1976) and that of T. angustifolia in Central Europe (Husa´k 1978). Cutting at 20 cm or 50 cm below the water surface was very effective in removing T. australis in the Senegal River (Hellsten et al 1999). Ulrich and Burton (1985) reported that cutting more than twice per year decreased the below-ground organs in the next year.…”

Section: Introductionmentioning

confidence: 95%

“…In recent years, the roles of these species in the purification of polluted water (Boyd and Hess 1970), protection of banks against boat-wash (Bonham 1983) and management of open water (Sale and Wetzel 1983;Hellsten et al 1999) have received attention. These macrophytes are planted in a biotope or lakeside with the expectation that they will play the above roles.…”

Section: Introductionmentioning

confidence: 99%

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Management of below-ground biomass of Typha angustifolia by harvesting shoots above the water surface on different summer days

et al. 2005

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A dynamic model of regrowth in Typha angustifolia after cutting shoots above the water surface was formulated by characterizing the phenology and mobilization of resources from below-ground to aboveground organs after the cutting. The model parameters were determined by two cutting experiments to investigate the different strategies with flowering and nonflowering shoots after cutting in 2001 and by four cutting experiments to elucidate the regrowth characteristics after cutting on different days from June to September in 2002. A difference was evident both for flowering and non-flowering shoots and for each cutting day. From June to August, non-flowering shoots regrew immediately after cutting, but flowering shoots did not. The shoot regrowth height, number of leaves and shoot biomass were higher with the earlier cutting. The model was validated using the below-ground biomass observed in December 2002 and below-ground dynamics observed in 2003. In the low-flowering shoot zone of the stands, in which the percentage of flowering shoots was small (around 10%), the decrease in below-ground biomass became larger from June (20%) to August (60%). Cutting the high-flowering shoot zone (flowering shoots: 78%) in July 2001, just 1 week after peduncle formation, decreased the below-ground biomass by about 50%. In the low-flowering shoot zone, cutting just before senescence is better for decreasing below-ground biomass with a smaller rate of flowering shoots. The difference of below-ground biomass reduction in non-flowering shoots is mainly due to the decrease in downward translocation (DWT) of above-ground material to below-ground organs during senescence, because of the decrease in regrowth biomass. As for flowering shoots, the decrease in the photosynthate transportation from above-ground to below-ground organs and that of DWT are closely related because they cannot grow again within the season.

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Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Management of below-ground biomass of Typha angustifolia by harvesting shoots above the water surface on different summer days

et al. 2005

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“…Physical disturbances such as grazing, mowing, disking, shearing, crushing, and scraping are commonly used to control Typha (Beule 1979;Murkin and Ward 1980;Schultz 1987;Ball 1990;Sojda and Solberg 1993;Payne 1998;Wilcox et al 2018). Weed-cutting boats (Hellsten et al 1999), fangueo aquatic tractors (Osland et al 2011), aquatic weed-wackers (Lishawa et al 2015), conventional agriculture equipment including haybines and rotary disc mowers (Grosshans et al 2013;Grosshans et al 2014;Svedarsky et al 2016) and a tracked biomass harvester (Lishawa et al 2017) (Fig. 9d) have been used to remove Typha or reduce its biomass.…”

Section: Physical Disturbancementioning

confidence: 99%

Typha (Cattail) Invasion in North American Wetlands: Biology, Regional Problems, Impacts, Ecosystem Services, and Management

et al. 2019

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Typha is an iconic wetland plant found worldwide. Hybridization and anthropogenic disturbances have resulted in large increases in Typha abundance in wetland ecosystems throughout North America at a cost to native floral and faunal biodiversity. As demonstrated by three regional case studies, Typha is capable of rapidly colonizing habitats and forming monodominant vegetation stands due to traits such as robust size, rapid growth rate, and rhizomatic expansion. Increased nutrient inputs into wetlands and altered hydrologic regimes are among the principal anthropogenic drivers of Typha invasion. Typha is associated with a wide range of negative ecological impacts to wetland and agricultural systems, but also is linked with a variety of ecosystem services such as bioremediation and provisioning of biomass, as well as an assortment of traditional cultural uses. Numerous physical, chemical, and hydrologic control methods are used to manage invasive Typha, but results are inconsistent and multiple methods and repeated treatments often are required. While this review focuses on invasive Typha in North America, the literature cited comes from research on Typha and other invasive species from around the world. As such, many of the underlying concepts in this review are relevant to invasive species in other wetland ecosystems worldwide.

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“…The villages and cattle breeders Downloaded by [University of Cambridge] at 02:07 20 December 2014 must have access to open water. This is best done by local mowing and burning of the reeds, in order to keep the waterways open for villages and for the most important sites for livestock (see Hellstén et al, 1999). · Locate Dakar's new water uptake in the southern part of the lake.…”

Section: Resultsmentioning

confidence: 99%

Water Resources Development in the Lower Senegal River Basin: Conflicting Interests, Environmental Concerns and Policy Options

Varis¹,

Fraboulet-Jussila²

2002

International Journal of Water Resources Development

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The Senegal River is the lifeline of the westernmost part of the Sahelian zone in Africa. This zone has extreme problems with high population growth, rapid and uncontrolled urbanization, climate changes, widespread poverty, growing inequity, ethnic confrontations and stagnant economic development. This paper analyses the management system of Lac de Guiers-one of the largest lakes in West Africa-which is among the Senegal River's key management entities. A Bayesian network model is used to study the con icting interests among the various stakeholders, the environmental and social concerns in the region and the viability of a series of policy options for water resources development.

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Typha control efficiency of a weed-cutting boat in the Lac de Guiers in Senegal: a preliminary study on mowing speed and re-growth capacity

Cited by 8 publications

References 3 publications

Management of below-ground biomass of Typha angustifolia by harvesting shoots above the water surface on different summer days

Management of below-ground biomass of Typha angustifolia by harvesting shoots above the water surface on different summer days

Typha (Cattail) Invasion in North American Wetlands: Biology, Regional Problems, Impacts, Ecosystem Services, and Management

Water Resources Development in the Lower Senegal River Basin: Conflicting Interests, Environmental Concerns and Policy Options

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