Integration and role of planted trees in a bush-fallow cultivation system in central Zambia
Identifieur interne : 004024 ( Main/Exploration ); précédent : 004023; suivant : 004025Integration and role of planted trees in a bush-fallow cultivation system in central Zambia
Auteurs : N. Chidumayo [Zambie]Source :
- Agroforestry Systems [ 0167-4366 ] ; 1988-08-01.
Abstract
Abstract: The purpose of natural fallow in bush-fallow cultivaton systems is to improve soil fertility following a phase of cultivation and to provide useful forest products, including livestock feed. When natural fallow fails to serve these purposes, it can be supplemented or replaced by planted trees. This paper describes the development and function ofAcacia fallow in the Soli tribal land of central Zambia and examines the supplementary role of planted trees. The 31 woody species at five fallow sample sites were dominated byAcacia polyacantha. Thirty-nine percent of the species are leguminous and N-fixing while 42% are fodder plants. These species make thisAcacia fallow suitable for regeneration of soil fertility and production of fodder. The dominant species,A. polyacantha, has an extensive lateral root system and may attain a mean maximum girth at breast height (BH) of 125 cm within 20 years. In the study areaAcacia fallow regenerates from seed and root-stocks and with a maximum annual stem basal area increment of 0.87 m2ha−1 at BH can acumulate a total of 17.4 m2ha−1 in 20 years. However,Acacia fallow is poor in edible wild fruits and durable construction wood. The scarcity of fruits in the study area has been compensated by widespread planting of exotic fruit trees. Ninety percent of households have fruit trees (mean 2.3 fruit species per household). However, in spite of the scarcity of good construction wood in the Soli tribal land, no local initiative has developed to plant timber trees. A clear opportunity therefore exists to promote timber tree planting. Such a tree planting programme was started in the study area during the 1985/86 planting season (December-February) when 25,100 seedlings ofEcualyptus grandis, Gmelina arborea andLeuceana leucocephala were distributed, free of charge and the programme will continue until 1988. A survey carried out five to seven months after planting revealed that the survival ofE. grandis, L. leucocephala andG. arborea seedlings was 65%, 90% and 92%, respectively. The high mortality ofE. grandis seedlings was due to termite damage.
Url:
DOI: 10.1007/BF01890470
Affiliations:
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Chidumayo</name><affiliation wicri:level="1"><country xml:lang="fr">Zambie</country><wicri:regionArea>Biology Department, University of Zambia, Box 32379, Lusaka</wicri:regionArea><wicri:noRegion>Lusaka</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Agroforestry Systems</title><title level="j" type="sub">An International Journal incorporating Agroforestry Forum</title><title level="j" type="abbrev">Agroforest Syst</title><idno type="ISSN">0167-4366</idno><idno type="eISSN">1572-9680</idno><imprint><publisher>Kluwer Academic Publishers</publisher><pubPlace>Dordrecht</pubPlace><date type="published" when="1988-08-01">1988-08-01</date><biblScope unit="volume">7</biblScope><biblScope unit="issue">1</biblScope><biblScope unit="page" from="63">63</biblScope><biblScope unit="page" to="76">76</biblScope></imprint><idno type="ISSN">0167-4366</idno></series><idno type="istex">62F536EEC4E522A106387B49B27B936E11845066</idno><idno type="DOI">10.1007/BF01890470</idno><idno type="ArticleID">BF01890470</idno><idno type="ArticleID">Art6</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0167-4366</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abstract: The purpose of natural fallow in bush-fallow cultivaton systems is to improve soil fertility following a phase of cultivation and to provide useful forest products, including livestock feed. When natural fallow fails to serve these purposes, it can be supplemented or replaced by planted trees. This paper describes the development and function ofAcacia fallow in the Soli tribal land of central Zambia and examines the supplementary role of planted trees. The 31 woody species at five fallow sample sites were dominated byAcacia polyacantha. Thirty-nine percent of the species are leguminous and N-fixing while 42% are fodder plants. These species make thisAcacia fallow suitable for regeneration of soil fertility and production of fodder. The dominant species,A. polyacantha, has an extensive lateral root system and may attain a mean maximum girth at breast height (BH) of 125 cm within 20 years. In the study areaAcacia fallow regenerates from seed and root-stocks and with a maximum annual stem basal area increment of 0.87 m2ha−1 at BH can acumulate a total of 17.4 m2ha−1 in 20 years. However,Acacia fallow is poor in edible wild fruits and durable construction wood. The scarcity of fruits in the study area has been compensated by widespread planting of exotic fruit trees. Ninety percent of households have fruit trees (mean 2.3 fruit species per household). However, in spite of the scarcity of good construction wood in the Soli tribal land, no local initiative has developed to plant timber trees. A clear opportunity therefore exists to promote timber tree planting. Such a tree planting programme was started in the study area during the 1985/86 planting season (December-February) when 25,100 seedlings ofEcualyptus grandis, Gmelina arborea andLeuceana leucocephala were distributed, free of charge and the programme will continue until 1988. A survey carried out five to seven months after planting revealed that the survival ofE. grandis, L. leucocephala andG. arborea seedlings was 65%, 90% and 92%, respectively. The high mortality ofE. grandis seedlings was due to termite damage.</div></front></TEI><affiliations><list><country><li>Zambie</li></country></list><tree><country name="Zambie"><noRegion><name sortKey="Chidumayo, N" sort="Chidumayo, N" uniqKey="Chidumayo N" first="N." last="Chidumayo">N. Chidumayo</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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