Browsing by Author "Manyanda, Bernardol John"

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Biomass and volume models based on stump diameter for assessing degradation of Miombo woodlands in Tanzania
(Hindawi) Manyanda, Bernardol John; Mugasha, Wilson Ancelm; Nzunda, Emannuel F; Malimbwi, Rogers Ernest
Biomass and volume models based on stump diameter for assessing degradation of Miombo woodlands in Tanzania
(Hindawi, 2019) Manyanda, Bernardol John; Mugasha, Wilson Ancelm; Nzunda, Emannuel F; Malimbwi, Rogers Ernest
Models to estimate forest degradation in terms of removed volume and biomass from the extraction of wood fuel and logging using stump diameter (SD) are lacking. The common method of estimating removals is through estimating diameter at breast height (D) by applying equations relating measured D and SD. The estimated D is then used to estimate biomass and volume by means of allometric equations, which utilize D. Through this sequence of procedures, it is apparent that there is an accumulation of errors. This study developed equations for estimating volume, aboveground biomass (ABG), and belowground biomass (BGB) using SD in miombo woodlands of mainland Tanzania. Volume models were developed from 114 sample trees while AGB and BGB models were developed from 127 and 57 sample trees, respectively. Both site specific and regional models were developed. Over 70% of the variations in BGB, AGB, and volume were explained by SD. It was apparent that SD is inferior compared to measured D in explaining variation in volume and BGB but not AGB. However, the accuracy of BGB and volume estimates emanating directly from SD were far better than those obtained indirectly, i.e., volume or BGB estimates obtained from estimated D from SD, since the latter is affected by accumulation of regression equation errors. For improved accuracy of ABG, BGB, and volume estimates, we recommend the use of site specific models. However, for areas with no site specific models, application of regional models is recommended. The developed models will facilitate the addition of forest degradation as a REDD+ activity into the forthcoming FREL.
Drivers and their influences on variation of aboveground carbon removals in miombo woodlands of mainland Tanzania
(BMC [Commercial Publisher]) Manyanda, Bernardol John; Nzunda, Emmanuel Fred; Mugasha, Wilson Ancelm; Malimbwi, Rogers Ernest
Effects of drivers and their variations on the number of stems and aboveground carbon removals in miombo woodlands of mainland Tanzania
(BMC) Manyanda, Bernardol John; Nzunda, Emmanuel F; Mugasha, Wilson Ancelm; Malimbwi, Rogers Ernest
Estimates of volume and carbon stock removals in miombo Woodlands of mainland Tanzania
Manyanda, Bernardol John; Nzunda, Emmanuel F; Mugasha, Wilson Ancelm; Malimbwi, Rogers Ernest
Estimation of tree removals in Miombo woodlands of mainland Tanzania
(Sokoine University of Agriculture) Manyanda, Bernardol John
Stump height: a potential escalator of wood volume and carbon removals in miombo woodlands of mainland Tanzania
(Springer) Manyanda, Bernardol John; Malimbwi, Rogers Ernest; Mugasha, Wilson Ancelm; Nzunda, Emmanuel F.
Stump height: a potential escalator of wood volume and carbon removals in miombo woodlands of mainland Tanzania
(Springer, 2022-04) Manyanda, Bernardol John; Malimbwi, Rogers Ernest; Mugasha, Wilson Ancelm; Nzunda, Emmanuel F.
Mitigation and adaptation to climate change in developing countries require sustainable forest management through either retaining the forest unharvested, i.e., conservation or an increased need for proper tree harvesting. However, significant number of trees harvested in miombo woodland of mainland Tanzania are not cut at the specified stump height, i.e., 15 cm from the ground. Leaving extra stump height (ESH) would escalate wood vol- ume removals and hence carbon emissions. Better insights on the extent of wood volume and carbon emissions of ESH in miombo woodlands are apparently needed. This study intended to estimate volume and carbon of ESH in miombo woodland of mainland Tan- zania. Based on a sample of 5 264 stumps collected in miombo woodlands of Mainland Tanzania, total annual volume and annual carbon per hectare of ESH were estimated by using equation applicable to cylinder in R software. Result revealed that total annual vol- ume, annual volume and carbon per hectare lost through ESH were 3 800 000 m −3 year −1 , 0.098 ± 0.034m 3 ha −1 year −1 and 0.028 ± 0.009 tCha −1 year −1 , respectively. The volume and carbon loss from ESH per hectare per year escalate 6% and 5% of more volume and car- bon removals, respectively, in the entire miombo woodlands and its categories in mainland Tanzania. Since annual volume loss of ESH is almost 1⁄4 of annual volume deficit of 19.5 million m 3 year −1 , the deficit and further removals could be lowered through adhering to appropriate harvesting regulations.