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Grazing effects on vegetation dynamics in the savannah ecosystems of the sahel

Ecological processes 2023年第4期12卷 110-121页

作者： Haftay Hailu Gebremedhn Ousmane Ndiaye sylvanus Mensah Cofélas Fassinou simon Taugourdeau Torbern Tagesson paulo salgado African Center of Excellence for Climate-smart Agriculture and Biodiversity Conservation Haramaya University dispositif en partenariat 《 p?le pastoralisme et zones sèches 》 Route du Front de Terre BP 2057 P?le de Recherche de Hann ISRA Centre de Recherches Zootechniques de Dahra Institut Sénégalais de Recherches Agricoles Laboratoire de Biomathématiques et d’Estimations Forestières Faculté des Sciences Agronomiques Université d’Abomey-Calavi Chair of Forest Growth and Dendroecology Albert-Ludwigs-Universit?t Freiburg Faculté des sciences et Techniques Département BV Université Cheikh-Anta-Diop UMR sELMet CIRAD INRAE Institut Agro Univ Montpellier Department of physical Geography and Ecosystem science Lund University Department of Geosciences and Natural Resource Management University of Copenhagen

Background The savannah ecosystems of sahel have experienced continuous and heavy grazing of livestock for centuries but still, their vegetation response to grazing pressure remains poorly understood. In this study, we analysed the herbaceous plant dynamics, measured by species diversity, composition, cover, and biomass in response to grazing pressure in the savannah ecosystems of sahel. In senegal, we selected four savannah sites represented with high, moderate, light and no grazing intensity levels. Transect survey methods were used for sampling the vegetation data within each of the sites. species richness and composition were analysed using species accumulation curve and multivariate analyses. Furthermore, we used General Linear Models and a piecewise structural Equation Model(p sEM) to examine the relationships between grazing intensity, vegetation cover, diversity and *** The herbaceous species diversity and composition varied significantly among the different grazing intensity levels(p plant species composition shifted from the dominance of grass cover to the dominance of forb cover with increasing grazing pressure. Moreover, the attributes of species diversity, herbaceous biomass, and ground cover were higher on sites with low grazing than sites with high and moderate grazing intensity. Across all sites, species diversity was positively related to total biomass. The p sEM explained 37% of the variance in total biomass and revealed that grazing intensity negatively influenced total biomass both directly and indirectly through its negative influence on species *** Managing grazing intensity may lead to higher plant production and higher mixed forage establishment in the dryland savannah ecosystems. This information can be used to support land management strategies and promote sustainable grazing practices that balance the needs of livestock with the conservation of ecosystem health and biodiversity.

关键词： Biomass Biodiversity Diodella sarmentosa Forb Grazing intensity Invasive species pastoral ecosystem senegal West Africa

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Grazing effects on vegetation dynamics in the savannah ecosystems of the sahel

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Ecological processes 2023年 752-763页

作者： Haftay Hailu Gebremedhn Ousmane Ndiaye sylvanus Mensah Cofélas Fassinou simon Taugourdeau Torbern Tagesson paulo salgado African Center of Excellence for Climate-smart Agriculture and Biodiversity Conservation Haramaya University dispositif en partenariat 《p?le pastoralisme et zones sèches》 Route du Front de Terre BP 2057 P?le de Recherche de HannISRA Centre de Recherches Zootechniques de Dahra Institut Sénégalais de Recherches Agricoles Laboratoire de Biomathématiques et d'Estimations Forestières Faculté des Sciences Agronomiques Université d'Abomey-Calavi Chair of Forest Growth and Dendroecology Albert-Ludwigs-Universit?t Freiburg Faculté des sciences et Techniques Département BV Université Cheikh-Anta-Diop UMR sELMet CIRAD INRAE Institut Agro Univ Montpellier Department of physical Geography and Ecosystem science Lund University Department of Geosciences and Natural Resource Management University of Copenhagen

Background The savannah ecosystems of sahel have experienced continuous and heavy grazing of livestock for centuries but still, their vegetation response to grazing pressure remains poorly understood. In this study, we analysed the herbaceous plant dynamics, measured by species diversity, composition, cover, and biomass in response to grazing pressure in the savannah ecosystems of sahel. In senegal, we selected four savannah sites represented with high, moderate, light and no grazing intensity levels. Transect survey methods were used for sampling the vegetation data within each of the sites. species richness and composition were analysed using species accumulation curve and multivariate analyses. Furthermore, we used General Linear Models and a piecewise structural Equation Model(psEM) to examine the relationships between grazing intensity, vegetation cover, diversity and *** The herbaceous species diversity and composition varied significantly among the different grazing intensity levels(p plant species composition shifted from the dominance of grass cover to the dominance of forb cover with increasing grazing pressure. Moreover, the attributes of species diversity, herbaceous biomass, and ground cover were higher on sites with low grazing than sites with high and moderate grazing intensity. Across all sites, species diversity was positively related to total biomass. The psEM explained 37% of the variance in total biomass and revealed that grazing intensity negatively influenced total biomass both directly and indirectly through its negative influence on species *** Managing grazing intensity may lead to higher plant production and higher mixed forage establishment in the dryland savannah ecosystems. This information can be used to support land management strategies and promote sustainable grazing practices that balance the needs of livestock with the conservation of ecosystem health and biodiversity.

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