Decision-support tool for management of miombo woodlands: a matrix model approach

Mugasha, Wilson Ancelm; Bollandsås, Ole Martin; Zahabu, Eliakimu; Katani, J. Z.; Eid, Tron

doi:10.2989/20702620.2016.1233776

Cited by 5 publications

(4 citation statements)

References 40 publications

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“…In addition, the distribution of land management zone regimes and specific tree species growing in each zone have not been described [98]. The development of a matrix model will help promote better decisions in the management of miombo [119,120]. The finding of our studies suggest that models should focus on the development of management approaches tailored to each management zone (open or closed miombo) based on actual tree species presence, abundances, and its importance to local communities.…”

Section: Description Of the Structure For Management Planning Zonesmentioning

confidence: 98%

Dynamic Patterns of Trees Species in Miombo Forest and Management Perspectives for Sustainable Production—Case Study in Huambo Province, Angola

Chiteculo

Surový

2018

Forests

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This paper aims to assess important forest parameters, including tree density, diameter at breast height (DBH), and age distribution, investigate the dynamic growth of miombo tree species, and employ this information to design a management framework in miombo forests. The delineation of the management zones was based on unsupervised land cover classification that began with three zones where ground data was collected and increased to five zones. Eighteen circular plots (25.2 m radius) were randomly distributed over the study areas to assess the current situation and potential growth patterns for each species. The patterns of the six most representative tree species of miombo in Angola were described and we used KORFiT 2.4 software to fit data and develop growth curves for at least three miombo species. Growth function fitness was evaluated by root mean squared error (RMSE), coefficient of determination (R 2 ), significance of the parameters (p < 0.05), and Akaike's information criterion (AIC). The diameter distribution of miombo tree species resembled a typical distribution of uneven-aged forest stands; higher DBH classes had lower abundances of tree species. Logistic and Gompertz growth functions were the best fits for miombo tree species. Brachystegia spiciformis Benth., is suggested as a potential species for timber management in the region because they displayed high growth potential to more quickly reach an assumed minimum DBH of 20 cm. This study concluded that miombo forest stands present an irregular structure in which DBH distribution illustrated only two patterns: many small stems and a bimodal forest structure.

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Section: Description Of the Structure For Management Planning Zonesmentioning

confidence: 98%

Dynamic Patterns of Trees Species in Miombo Forest and Management Perspectives for Sustainable Production—Case Study in Huambo Province, Angola

Chiteculo

Surový

2018

Forests

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“…The number of tree and shrub species (88) encountered in the stands was fewer than some other studies in miombo ecosystems have been reported Giliba et al (2011) and Mugasha et al (2016), yet it was within the range of observed elsewhere in the miombo ecosystem (Isango et al, 2007;Kamangadazi, 2019;Mwakalukwa et al, 2014). The species composition did not change much during the study period, but some species seemed to contribute more than others in the process of recolonization of empty spaces.…”

Section: Discussionmentioning

confidence: 44%

“…Additionally, some up growth from saplings into trees at the threshold of 5 cm in diameter was also involved but with a minimal effect only. This is a typical miombo characteristic where a high density of coppice, root suckers, and seedlings are produced annually; but very few manage to grow to maturity (Chamshama et al, 2004;Mugasha et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

Regeneration Dynamics and Structural Changes in Miombo Woodland Stands at Kitulangalo Forest Reserve in Tanzania

Njoghomi

Valkonen

Karlsson

et al. 2020

Journal of Sustainable Forestry

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The sustainability of the seriously threatened African miombo woodlands depends on their capability to maintain sufficient natural regeneration. This study focused on the regeneration dynamics and the impacts of silvicultural treatments of fencing, site preparation, and thinning in the Kitulangalo forest reserve in Tanzania. Mixed models were applied to analyze the change in number of stems during the nine-years observation period on a set of permanent experimental plots. There was a significant decrease in the total number of stems (from 29 800 ha −1 to 19 100 ha −1 ) but a significant increase in the number of main stems (from 9 300 ha −1 to 11 100 ha −1 ) during observation period. The proportion of empty regeneration plots (zero seedlings and saplings on a regeneration plot of 4 m 2 ) was initially very low (7.3%) and decreased further during the study period to 5.3%. Greater stand density was associated with lower density of regeneration. Fencing implied a greater increase in the number of main stems but a sharper drop in the total number of stems by reducing animal disturbances. The findings indicate that the forests at Kitulangalo are recovering from past abuse and likely developing toward more sustainable stand structures and sustainability.

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“…Of all harvesting alternatives, "no harvesting" resulted in the largest basal area (18.7 m 2 ha -1 ), net volume growth (83 m 3 ha -1 ), and stem biomass (49 t C ha -1 ) in 99 years, which was dominated by species group 1 because of bigger diameter trees compared to other groups. Generally, simulation of stand dynamics under harvesting alternatives with "varying intensity" and "uniform intensity" tends to arrive at relatively similar steady-state stand conditions in terms of density, basal area, volume, and accumulation of above-ground biomass carbon after 99 years (Hofstad et al 2015, Mugasha et al 2016. Despite the relative similarities in the stand attributes achieved through the applied harvesting alternatives, the use of "varying intensity" harvesting can be considered ecologically friendly for wood production through stand density, volume growth, and biomass accumulation in miombo woodlands.…”

Section: Pathways For Maximizing Stand Growth Wood Production and Ecological Recovery In Miombo Woodlands (Iii)mentioning

confidence: 99%

Tree growth dynamics and ecological recovery in Kitulangalo miombo woodlands Morogoro, Tanzania

Njoghomi¹

2021

Diss. For.

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This research focuses on stand dynamics and ecological recovery in miombo woodlands, Morogoro, Tanzania. The study uses the Kitulangalo Permanent Sample Plots (PSPs) to analyse tree species' site-specific growth, regeneration dynamics, and stand development using empirical and modeling approaches. The high number of tree species in miombo necessitated the formulation of three species groups involving 1) trees that grow relatively rapidly to be dominants in top canopy layers 2) trees that stay mainly in the lower and middle canopy levels and 3) trees that grow slowly but persistently and may eventually rise to dominant and codominant canopy positions applied in studies I and III. Study III also applies three harvesting alternatives, which align with the recommended harvesting practices for these woodlands.Diameter increment varied with the change in basal area growth across species groups, reaching a maximum of 3.2 cm (group 1) during 2008-2016. Density-dependent mortality and ingrowth also varied with species group as higher mortality rates dominated the lower and middle canopy layers due to asymmetrical competitions. Fencing the plots prompted thick grass cover. The drop in the total number of regeneration stems and the simultaneous increase in the number of main stems in fenced areas and dense plots indicated a self-thinning process induced by competition. This is linked to multi-stem regeneration undergoing a morphological transformation into single-stem saplings (main stems) and eventually becoming small trees. Harvesting intensity, density-dependent mortality, and ingrowth regulated stand basal area and therefore stand growth and development during the simulation. Stand structural development was dominated by species groups 1 and 2, indicating sustainability in species composition and structures. Stand development was affected by the addition of new stems of each species in each simulation year.Miombo stands have demonstrated the potential to attain a steady-state condition over the medium-term under-regulated stand conditions and silvicultural treatments. The developed models, treatments, and harvesting alternatives may be limited in application to Kitulangalo and similar lowland miombo woodlands in Tanzania. Future studies concerning stand conditions, silvicultural treatments, and harvesting alternatives are vital for a better understanding of stand dynamics in miombo woodlands in Tanzania.

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Decision-support tool for management of miombo woodlands: a matrix model approach

Cited by 5 publications

References 40 publications

Dynamic Patterns of Trees Species in Miombo Forest and Management Perspectives for Sustainable Production—Case Study in Huambo Province, Angola

Dynamic Patterns of Trees Species in Miombo Forest and Management Perspectives for Sustainable Production—Case Study in Huambo Province, Angola

Regeneration Dynamics and Structural Changes in Miombo Woodland Stands at Kitulangalo Forest Reserve in Tanzania

Tree growth dynamics and ecological recovery in Kitulangalo miombo woodlands Morogoro, Tanzania

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