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Impacts of pine and eucalyptus plantations on carbon and nutrients stocks and fluxes in miombo forests ecosystems

Guedes, Benard (2016). Impacts of pine and eucalyptus plantations on carbon and nutrients stocks and fluxes in miombo forests ecosystems. Uppsala : Sveriges lantbruksuniv.
ISBN 978-91-576-9408-9
eISBN 978-91-576-9409-6
[Licentiate thesis]

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Abstract

Knowledge of how commercial pine and eucalyptus plantations affect soil carbon and nutrient status is important in Mozambique, where incentives are available to increase the area of forest plantations and also to conserve mature miombo forests. Tree species growing on similar sites may affect ecosystem carbon differently if they allocate carbon to aboveground and belowground parts at different rates. Moreover, changes in ecosystem carbon and nutrient status are closely correlated. This thesis examined the effects of first-rotation (around 34 years old) commercial plantation of Pinus taeda L. (Loblolly pine), Eucalyptus grandis Hill ex. Maiden and Eucalyptus cloeziana F. Muell in Mozambique on carbon and nutrient stocks, carbon fluxes (CF) and net primary production (NPP) compared with adjacent miombo forests.

At three study sites (Penhalonga, Inhamacari, Rotanda) in the Western Highlands of Manica Province, Mozambique, plots of Pinus taeda, Eucalyptus grandis and mixed-deciduous miombo species were delineated to investigate soil carbon and nutrient status (0-10, 10-30, 30-50 cm depth). Additional plots with these three stand types were established at Inhamacari to determine aboveground and belowground carbon stocks, CF and NPP. Aboveground carbon stocks were estimated using allometric biomass equations (ABEs) developed in this thesis, while belowground biomass was estimated using root-shoot ratio values from the literature.

Tree carbon stocks, net annual rate of carbon accumulation by trees, carbon allocation to litterfall and to fine root production and NPP were all significantly higher in Pinus taeda and Eucalyptus cloeziana plantations than in Miombo forest. Total (0-50 cm) soil carbon stocks, but not total soil nitrogen stocks, increased significantly following Pinus taeda and Eucalyptus grandis plantation. However, soil nitrogen stocks were higher in the top 10-cm layer of plantation soil than Miombo forest soil. Plantation of Pinus taeda had no effect on soil acidity, but Eucalyptus grandis increased soil pH (10-50 cm) and reduced total stock of extractable soil phosphorus (0-50 cm).

Thus overall, after around 34 years, tree carbon stocks, aboveground and belowground carbon fluxes, total carbon stocks and NPP were higher in commercial plantations than in natural Miombo forest. The commercial plantations affected soil acidity and soil nutrient status differently, apart from total soil N stocks. Another novel contribution of the present work was development of ABEs for high-altitude Miombo forests and commercial plantations of Pinus taeda, Eucalyptus cloeziana and E. grandis in Mozambique.

Authors/Creators:Guedes, Benard
Title:Impacts of pine and eucalyptus plantations on carbon and nutrients stocks and fluxes in miombo forests ecosystems
Year of publishing :23 May 2016
Depositing date:23 May 2016
Number of Pages:49
Papers/manuscripts:
NumberReferences
IBenard S. Guedes, Bengt A. Olsson, Erik Karltun. Effects of 34-year-old Pinus taeda and Eucalyptus grandis plantation on soil carbon and nutrient status in former miombo forest soils (manuscript).
IIBenard S. Guedes, Bengt A. Olsson, Almeida A. Sitoe, Gustaf Egnell. Replacement of mountain miombo forest by Pinus taeda and Eucalyptus cloeziana plantations increases carbon stocks, carbon fluxes and net primary production (manuscript).
Place of Publication:Uppsala
Publisher:Department of Ecology, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-9408-9
ISBN for electronic version:978-91-576-9409-6
Language:English
Publication Type:Licentiate thesis
Full Text Status:Public
Agris subject categories.:K Forestry > K10 Forestry production
P Natural resources > P33 Soil chemistry and physics
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Agrovoc terms:eucalyptus, pinus, forest plantations, carbon stock assessments, nitrogen, nutrient availability, soil fertility, litter, roots, ph, mozambique
Keywords:Carbon fluxes, litterfall, fine root production, net primary production, Miombo forest, pH, biomass allometric equations, Mozambique
URN:NBN:urn:nbn:se:slu:epsilon-e-3449
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-3449
ID Code:13403
Faculty:S - Faculty of Forest Sciences
Department:(NL, NJ) > Dept. of Ecology
(S) > Dept. of Ecology
External funders:Swedish International Development Cooperation Agency
Deposited By: Mr BS Guedes
Deposited On:23 May 2016 12:27
Metadata Last Modified:23 May 2016 12:27

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