Soil microbial communities following bush removal in a Namibian savanna

Savanna ecosystems are subject to desertification and bush encroachment, which reduce the carrying capacity for wildlife and livestock. Bush thinning is a management approach that can, at least temporarily, restore grasslands and raise the grazing value of the land. In this study we examined the soi...

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Vydáno v:	Soil Ročník 2; číslo 1; s. 101 - 110
Hlavní autoři:	Buyer, Jeffrey S., Schmidt-Küntzel, Anne, Nghikembua, Matti, Maul, Jude E., Marker, Laurie
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Göttingen Copernicus GmbH 01.01.2016 Copernicus Publications
Témata:	Archaea Bacteria Biomass carbon Carrying capacity Chromatography chronosequences Community structure Deoxyribonucleic acid Desertification DNA Ecosystems Encroachment Fatty acids Fungi Gram-positive bacteria Grasses Grasslands grazing Livestock Microbial activity microbial biomass microbial communities Microorganisms Namibia nitrogen Perturbation pH effects phospholipid fatty acids Phospholipids Polymorphism Restriction fragment length polymorphism Ribosomal DNA savanna soils Savannahs savannas shrubs Soil Soil analysis soil bacteria soil fungi soil pH Soils Thinning Vegetation Vegetation type Wildlife Namibia United States > US
ISSN:	2199-398X, 2199-3971, 2199-398X, 2199-3971
On-line přístup:	Získat plný text
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Popis
Shrnutí:	Savanna ecosystems are subject to desertification and bush encroachment, which reduce the carrying capacity for wildlife and livestock. Bush thinning is a management approach that can, at least temporarily, restore grasslands and raise the grazing value of the land. In this study we examined the soil microbial communities under bush and grass in Namibia. We analyzed the soil through a chronosequence where bush was thinned at 9, 5, or 3 years before sampling. Soil microbial biomass, the biomass of specific taxonomic groups, and overall microbial community structure was determined by phospholipid fatty acid analysis, while the community structure of Bacteria, Archaea, and fungi was determined by multiplex terminal restriction fragment length polymorphism analysis. Soil under bush had higher pH, C, N, and microbial biomass than under grass, and the microbial community structure was also altered under bush compared to grass. A major disturbance to the ecosystem, bush thinning, resulted in an altered microbial community structure compared to control plots, but the magnitude of this perturbation gradually declined with time. Community structure was primarily driven by pH, C, and N, while vegetation type, bush thinning, and time since bush thinning were of secondary importance.
Bibliografie:	http://dx.doi.org/10.5194/soil-2-101-2016 http://handle.nal.usda.gov/10113/62000 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23
ISSN:	2199-398X 2199-3971 2199-398X 2199-3971
DOI:	10.5194/soil-2-101-2016