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

作     者：Haftay Hailu Gebremedhn Ousmane Ndiaye Sylvanus Mensah Cofélas Fassinou Simon Taugourdeau Torbern Tagesson Paulo Salgado Haftay Hailu Gebremedhn;Ousmane Ndiaye;Sylvanus Mensah;Cofélas Fassinou;Simon Taugourdeau;Torbern Tagesson;Paulo Salgado

作者机构：African Center of Excellence for Climate-Smart Agriculture and Biodiversity ConservationHaramaya UniversityP.O.Box 138Dire DawaEthiopia Dispositif en Partenariat«Pôle Pastoralisme Et Zones Sèches»Route du Front de Terre BP 2057Pôle de Recherche de HannISRADakarSenegal Centre de Recherches Zootechniques de DahraInstitut Sénégalais de Recherches AgricolesDakarSenegal Laboratoire de Biomathématiques et d’Estimations ForestièresFacultédes Sciences AgronomiquesUniversitéd’Abomey-CalaviCotonouBenin Chair of Forest Growth and DendroecologyAlbert-Ludwigs-Universität FreiburgFreiburg Im BreisgauGermany Facultédes Sciences et TechniquesDépartement BVUniversitéCheikh-Anta-DiopDakarSenegal UMR SELMETCIRADINRAEInstitut Agro Univ MontpellierMontpellierFrance Department of Physical Geography and Ecosystem ScienceLund UniversitySölvegatan 1222362 LundSweden Department of Geosciences and Natural Resource ManagementUniversity of CopenhagenØster Voldgade 101350 CopenhagenDenmark 

出 版 物：《Ecological Processes》 (生态过程（英文）)

年 卷 期：2023年第12卷第1期

页      面：752-763页

核心收录：

学科分类：0905[农学-畜牧学] 09[农学] 

基　　金：funded by the New Zealand Government to support the objectives of the Global Research Alliance on Agricultural Greenhouse Gases the CaSSECS project(Carbon Sequestration and Green-house Gas Emissions in(Agro)Sylvopastoral Ecosystems in the Sahelian CILSS States)[FOOD/2019/410-169] Tagesson was additionally funded by the Swedish National Space Agency(SNSA 2021-00144 2021-00111)and FORMAS(Dnr.2021-00644) 

主　　题：Biomass Biodiversity Diodella sarmentosa Forb Grazing intensity Invasive species Pastoral ecosystem Senegal West Africa 

摘      要：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 *** 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 *** Senegal,we selected four savannah sites represented with high,moderate,light and no grazing intensity *** survey methods were used for sampling the vegetation data within each of the *** richness and composition were analysed using species accumulation curve and multivariate ***,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(p0.001).The plant species composition shifted from the dominance of grass cover to the dominance of forb cover with increasing grazing ***,the attributes of species diversity,herbaceous biomass,and ground cover were higher on sites with low grazing than sites with high and moderate grazing *** all sites,species diversity was positively related to total *** 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 *** 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.