Estimates of volume and carbon stock removals in miombo Woodlands of mainland Tanzania
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Date
2020
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Abstract
Miombo woodlands are major vegetation type covering about 93% of the forest land of Mainland Tanzania. It forms an integral
part of the rural landscape in Tanzania and plays a crucial role in providing a wide range of goods and services including carbon
sequestration. However, the sustainability of forest resources is mostly affected by the magnitude of its utilization. There should be
a balance between the forest growth and removals. Nevertheless, the magnitude of removed volume and carbon in the country is
not known. Quantification of volume, biomass, and carbon stocks removals is vital in developing effective climate change
mitigation strategies, decision making, and promoting sustainable forest management. Based on the National Forest Resources
Monitoring and Assessment data (NAFORMA) comprising 7,026 stumps collected from 16,803 circular plots of 10 m and 15 m
radii established in Miombo woodlands of Mainland Tanzania, volume and carbon stock removals were estimated with the use of
models that utilize stump diameter (SD) as the sole predictor. Results indicate that the annual volumes, aboveground biomass
removed, and belowground biomass removed were 1.71 ± 0.54 m 3 ha −1 year −1 , 1.23 ± 0.37 t ha −1 year −1 , and 0.43 ± 0.12 t ha −1
year −1 , respectively. In addition, the corresponding aboveground and belowground carbon removed were found to be 0.6 ± 0.18 tC
ha −1 year −1 and 0.21 ± 0.05 tC ha −1 year −1 respectively. Since the estimated annual volume removals exceed estimated mean
annual increment of 1.6 ± 0.2 m 3 ha −1 year −1 in Miombo woodlands, the removals indicate unsustainability that would end up into
forest degradation. The results also show that removals are more prominent in the following categories: shifting cultivation,
production forest, grazing land, general land, village land, and Eastern and Southern zones. This paper calls for increased
appropriate management strategies to ensure sustainability in these land categories and in the entire Miombo woodlands of
Mainland Tanzania.
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Journal Article
Keywords
Carbon Stock, Miombo, Woodlands, vegetation type