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Tree communities and structural dynamics in miombo (Brachystegia-Julbernardia) woodland, Tanzania
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Biologiska sektionen, Institutionen för ekologi och evolution, Ekologisk botanik.
Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Samhällsvetenskapliga fakulteten, Kulturgeografiska institutionen.
2006 (Engelska)Ingår i: Forest Ecology and Management, ISSN 0378-1127, E-ISSN 1872-7042, Vol. 230, nr 1-3, s. 171-178Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Tree vegetation and size structure was sampled in a miombo woodland area in E Tanzania and related to environmental factors, particularly soil and disturbance history. A total of 86 tree species was found. Four plant communities were distinguished through multivariate classification. Community 1 was dominated by Brachystegia boehmii, Brachystegia bussei and Julbernardia globiflora, and community 2 by B. boehmii and Brachystegia spiciformis. Community 1 was found on grey, eroded soil and community 2 on red, residual soil, a fact that opens up possibilities to use soil signals of satellite data for vegetation mapping. Community 3 is heavily disturbed miombo woodland near villages and community 4 was found on more clayey soil where miombo woodland is not expected. At our 42 sampled sites, density ranged from 74 to 1041 individuals ha−1 and basal area from 3.9 to 16.7 m2 ha−1. Regeneration is generally good but large sized trees are less prominent in communities 3 and 4 due to harvesting. With reduced disturbance miombo species may rapidly resume dominance in community 3. A higher than expected representation by the size class 30–40 (−50) cm dbh in community 2 is probably related to disturbance history. Prevalence of certain species (Pseudolachnostylis maprouneifolia, Pterocarpus angolensis and Diplorhynchos condylocarpon) may be related to frequent fires. Selective logging will soon cause extinction of Dalbergia melanoxylon, whereas Pterocarpus angolensis still has good regeneration, possibly because individuals below logging size have a good seed set. A way to get an easy overview of size classes in all species in an area using PCA is discussed.

Ort, förlag, år, upplaga, sidor
2006. Vol. 230, nr 1-3, s. 171-178
Nyckelord [en]
Brachystegia boehmii; Brachystegia spiciformis; CA; human impact; Tanzania; Kilosa District; PCA; Pterocarpus angolensis; soil colour; tree size structure
Nationell ämneskategori
Ekologi
Identifikatorer
URN: urn:nbn:se:uu:diva-24120DOI: 10.1016/j.foreco.2006.04.033ISI: 000238863300015OAI: oai:DiVA.org:uu-24120DiVA, id: diva2:51894
Tillgänglig från: 2007-02-03 Skapad: 2007-02-03 Senast uppdaterad: 2017-12-07Bibliografiskt granskad

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Backéus, IngvarStrömquist, Lennart

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Totalt: 542 träffar
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