Regeneration of indigenous trees in Mgahinga Gorilla National Park, Uganda
Identifieur interne : 000920 ( Istex/Checkpoint ); précédent : 000919; suivant : 000921Regeneration of indigenous trees in Mgahinga Gorilla National Park, Uganda
Auteurs : Julius B. Lejju [Ouganda] ; Hannington Oryem-Origa [Ouganda] ; John M. Kasenene [Ouganda]Source :
- African Journal of Ecology [ 0141-6707 ] ; 2001-03.
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Abstract
This study examines the regeneration of indigenous tree species in the formerly encroached area in Mgahinga Gorilla National Park (MGNP), south‐western Uganda. Before gazetting in 1992, MGNP had basically been agricultural land for well over 50 years. The distribution of exotic vegetation was established using a Geographical Positioning System receiver and indigenous vegetation was sampled by establishment of quadrats along transect lines. Observations indicated that approximately 2% of the old cropland was covered by exotic woodlots. Black wattle (Acacia mearnsii) and Eucalyptus trees were found to be the most widely distributed and Pinus patula the least distributed species in the park. Species numbers of indigenous trees (n = 26) were high in the old cropland, compared with twelve species observed in exotic woodlots. The natural forest supported the highest (75%) stem density and the lowest (4%) stem density was recorded in exotic woodlots. Seedling class (< 2 cm, d.b.h.) accounted for the majority of juveniles, with the lowest stem density (1350 seedlings ha−1) recorded in exotic woodlots compared with 6609 seedlings ha−1 in the old cropland and 24,625 seedlings ha−1 in the natural forest. The levels of tree diversity and stocking characteristics recorded under the exotic species suggest that a low diverse community of native species may exploit this environment.
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DOI: 10.1111/j.1365-2028.2001.00273.x
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Lejju</name><affiliation wicri:level="1"><country xml:lang="fr" wicri:curation="lc">Ouganda</country><wicri:regionArea>Department of Biology, Mbarara University of Science & Technology, Mbarara</wicri:regionArea><wicri:noRegion>Mbarara</wicri:noRegion></affiliation></author><author><name sortKey="Oryem Riga, Hannington" sort="Oryem Riga, Hannington" uniqKey="Oryem Riga H" first="Hannington" last="Oryem-Origa">Hannington Oryem-Origa</name><affiliation wicri:level="1"><country xml:lang="fr">Ouganda</country><wicri:regionArea>Department of Botany, Makerere University, Kampala</wicri:regionArea><wicri:noRegion>Kampala</wicri:noRegion></affiliation></author><author><name sortKey="Kasenene, John M" sort="Kasenene, John M" uniqKey="Kasenene J" first="John M." last="Kasenene">John M. Kasenene</name><affiliation wicri:level="1"><country xml:lang="fr">Ouganda</country><wicri:regionArea>Department of Botany, Makerere University, Kampala</wicri:regionArea><wicri:noRegion>Kampala</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">African Journal of Ecology</title><idno type="ISSN">0141-6707</idno><idno type="eISSN">1365-2028</idno><imprint><publisher>Blackwell Science Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2001-03">2001-03</date><biblScope unit="volume">39</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="65">65</biblScope><biblScope unit="page" to="73">73</biblScope></imprint><idno type="ISSN">0141-6707</idno></series><idno type="istex">90836B7106D7C62F9778A80307B92EF4380BB37F</idno><idno type="DOI">10.1111/j.1365-2028.2001.00273.x</idno><idno type="ArticleID">AJE273</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0141-6707</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Mgahinga</term><term>afromontane</term><term>encroachment</term><term>exotic</term><term>nutrients</term><term>woodlot</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">This study examines the regeneration of indigenous tree species in the formerly encroached area in Mgahinga Gorilla National Park (MGNP), south‐western Uganda. Before gazetting in 1992, MGNP had basically been agricultural land for well over 50 years. The distribution of exotic vegetation was established using a Geographical Positioning System receiver and indigenous vegetation was sampled by establishment of quadrats along transect lines. Observations indicated that approximately 2% of the old cropland was covered by exotic woodlots. Black wattle (Acacia mearnsii) and Eucalyptus trees were found to be the most widely distributed and Pinus patula the least distributed species in the park. Species numbers of indigenous trees (n = 26) were high in the old cropland, compared with twelve species observed in exotic woodlots. The natural forest supported the highest (75%) stem density and the lowest (4%) stem density was recorded in exotic woodlots. Seedling class (< 2 cm, d.b.h.) accounted for the majority of juveniles, with the lowest stem density (1350 seedlings ha−1) recorded in exotic woodlots compared with 6609 seedlings ha−1 in the old cropland and 24,625 seedlings ha−1 in the natural forest. The levels of tree diversity and stocking characteristics recorded under the exotic species suggest that a low diverse community of native species may exploit this environment.</div></front></TEI><affiliations><list><country><li>Ouganda</li></country></list><tree><country name="Ouganda"><noRegion><name sortKey="Lejju, Julius B" sort="Lejju, Julius B" uniqKey="Lejju J" first="Julius B." last="Lejju">Julius B. Lejju</name></noRegion><name sortKey="Kasenene, John M" sort="Kasenene, John M" uniqKey="Kasenene J" first="John M." last="Kasenene">John M. Kasenene</name><name sortKey="Oryem Riga, Hannington" sort="Oryem Riga, Hannington" uniqKey="Oryem Riga H" first="Hannington" last="Oryem-Origa">Hannington Oryem-Origa</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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