TITLE:
The Status of Canopy Density and above Ground Biomass along the Northern Coastal Forest Zone of Tanzania
AUTHORS:
Iddi H. Hassan, Makarius V. Mdemu
KEYWORDS:
Coastal Forests, Canopy Density, Forest Biomass, Carbon Density, Pugu and Kazimzumbwi Forests, Jozani-Chwaka Bay National Park, Ngezi Nature Reserve Tanzania
JOURNAL NAME:
Open Journal of Forestry,
Vol.11 No.1,
January
29,
2021
ABSTRACT: Canopy density and forest biomass estimation are critical for understanding of the carbon cycle, climate change and detecting health status of the forest ecosystems. This study was conducted on the coastal forests reserves in Zanzibar and mainland
Tanzania. A systematic sampling design was used to establish a total of 110
temporary sample plots in all study sites. The stratification of the forests
was adopted to identify closed forest patches with less anthropogenic effects. The study assessed the forest canopy
density and above ground biomass with relative carbon stock for closed forest
classes. Jozani Chwaka Bay National Park in Zanzibar recorded higher average
canopy densities of 63% followed by Ngezi (46%), Pugu forests (26%) and Kazimzumbwi (16%). However, Ngezi forest had higher forest biomass than all
study sites with the overall mean AGB of
138.5 tAGB/ha equivalent to carbon stock
of 67.9 tC/ha. Tree species, Bombax rhodognaphala (Msufi mwitu) and Antiaris toxicaria (Mgulele) recorded the highest biomass of 1099 tABG/ha
and 703 tAGB/ha (equivalent to 538 tC/ha and (345 tC/ha)) respectively. The study revealed that about 35% of the total closed forest
patches at Pugu FR were covered by lower canopy density which accounted about 490 ha.
Kazimzumbwi FR was dominated by lower canopy density which represented about
64% of the total forest cover area (1750 ha).