Impacts of fire history in a semi-arid woodland savanna
Rattachement africain : Namibie, de, Afrique du Sud, us, ru. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
Fire is known to be an important element shaping semi-arid ecosystems.Within SASSCAL we conducted several projects in the woodland savanna of the Waterberg Plateau Park to gain a better understanding of the impact of fi re on ecosystem properties and processes (soil characteristics, species composition and structure of the vegetation, changes in plant forage quality, insect biodiversity, and the utilization of habitat and plants by large herbivores).Four adjacent areas of around 2,000 ha-2,500 ha each with diff erent times since last burn were studied (in 2014, when most of the measurements were done, the areas had been burnt 2, 3, 14, and 24 years prior to the study).We found inconsistent eff ects of diff erent fi re histories on soil nutrients, soil organic carbon, and soil respiration, which suggests that soil resources return rapidly (within a year or two) to pre-fi re conditions at our sites.We also assume (based on the standing biomass of the four areas during the study) that the fi res were likely to have not been suffi ciently intense to cause long-term detrimental impacts and impair the recovery of soil resources at our sites.Furthermore, fi re positively aff ected the grass component by increasing grass density and enhancing productivity.Fire maintained open savannas through the top-kill of woody plants but did not alter plant species composition.The infl uence of burning on the quality of grasses was relatively short-lived (two years after burning, grass quality in burnt sites was comparable with that of unburnt sites).However, trees, whose leaves are generally higher in protein, remained at a higher quality for longer periods after fi re and thus served as supplementary food not only for browsers and mixed feeders but also for herbivores generally considered to be 'pure' grazers (e.g., red hartebeest, buff alo).Fire had a negative impact on small ground-nesting bees, whereas bigger and above-ground-nesting bees seemed to be favoured by fi re.Ground-dwelling invertebrate communities diff ered with time since last burn, the main driver of the diff erences being litter cover.Our fi ndings in relation to fi re illustrate that heterogeneous habitats, as a result of pyrodiversity, are of great benefi t for the habitat utilization and plant utilization of large herbivores as well as increasing the overall diversity of invertebrates.Managers can maximise biodiversity and diversity in resource and habitat utilization by maximising the diversity of fi re histories in the managed areas (commonly termed patch-mosaic burning).Resumo: O fogo é conhecido por ser um importante factor na modelação dos ecossistemas semi-áridos.No contexto do SASSCAL, realizámos vários projectos na savana arborizada do Parque Nacional de Waterberg, de modo a obter uma melhor compreensão do impacto do fogo nas propriedades e processos do ecossistema (características do solo, composição e estrutura da vegetação, alterações na qualidade de forragem, biodiversidade de insectos e utilização do habitat e das plantas pelos grandes herbívoros).Foram estudadas quatro áreas adjacentes, de cerca de 2000 a 2500 ha, com diferentes tempos desde o último incêndio (em 2014, altura em que a maioria das medições foi realizada, as áreas haviam sido queimados há 2, 3, 14 e 24 anos).Encontrámos efeitos inconsistentes de diferentes historiais de fogo nos nutrientes, carbono orgânico e respiração do solo, o que sugere que os recursos pedológicos retornam rapidamente (dentro de um ano ou dois) a condições de pré-fogo
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Impacts of fire history in a semi-arid woodland savanna
- Date Crossref
- 14/04/2018
- Éditeur
- University of Hamburg, Biodiversitat, Evolution and Okologie der Pflanzen
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Namibia University of Science and Technology Windhoek, Namibie (code pays fourni par la source)Université ou école supérieure
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Universität Hamburg pays non établi dans la noticeUniversité ou école supérieure
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University of Namibia Namibie (code pays fourni par la source)Université ou école supérieure
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South African Weather Service Afrique du Sud (code pays fourni par la source)Organisme public
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Southern African Science Service Centre for Climate Change and Adaptive Land Management pays non établi dans la noticeStructure de recherche
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Stellenbosch University Stellenbosch University, Afrique du Sud (code pays fourni par la source)Université ou école supérieure
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Hamburg Institut (Germany) pays non établi dans la noticeEntreprise
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Arizona State University pays non établi dans la noticeUniversité ou école supérieure
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Ministry of Natural Resources and Environment pays non établi dans la noticeOrganisme public
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Ministry of Environment and Tourism Department of Natural Resource Management Namibie (code pays fourni par la source)Organisme public
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University of Hamburg Institute for Plant Science and Microbiology pays non établi dans la noticeUniversité ou école supérieure
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Faculty of AgriSciences Department of Soil Science Stellenbosch University Hamburg, Afrique du Sud (ville ou établissement reconnu, pays non nommé)Université ou école supérieure
Namibia University of Science and Technology (Windhoek, Namibie), Universität Hamburg et University of Namibia (Namibie), avec 9 autres affiliations. Pays d’affiliation : Namibie, Afrique du Sud.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.