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Biodiversity Conservation and Carbon Sequestration in Agroforestry Systems of the Mbalmayo Forest Reserve

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We conducted an analysis of agroforestry system efficiency to conserve biodiversity in the Mbalmayo Forest Reserve (MFR) between March 2018 and June 2018. A synthesis of forest fragmentation data observed on multiple strata and scale satellite imageries over 31 years, between 1987 and 2018 as well as, the use of both a floristic and a faunal surveys, revealed that although 29.28% of natural forests was fragmented and converted to agroforests landscapes, banana and cocoa based agroforest appeared to perform the most relevant records in carbon storage and to attract wild terrestrial and avifauna. Analysis of NDVI, NDWI and Iron Oxyde helped monitor the vegetation cover of the reserve, and differentiate natural and fragmented classes, majority of conserved forest wetlands and agroforestry systems, and a minority of natural dryland forest. Further analysis also revealed significant correlations between NDVI and Shannon Index, and between NDVI and carbon stock. Based on the NDVI value and the equation Y=3.827×X−1.587 (where Y for the carbon stocks and X for NDVI value), we estimated the total carbon stock of the forest reserve at about 99557.6 tonnes, and its mean value at about 8.491 tons/ha. Nevertheless, environmental efforts to sustainably manage agroforestry landscape appear to be a relevant key to conserve wild biodiversity and mitigate climate change at the level of the Mbalmayo Forest Reserve. If anthropogenic activities have deeply changed the reserve’s natural landscape, reduced its carbon sequestration performance, and wildlife conservation status, forest wetlands appear to remain its most conserved places and the best refuge for wild fauna still occurring in diverse strata of the MFR.

Abstract

We conducted an analysis of agroforestry system efficiency to conserve biodiversity in the Mbalmayo Forest Reserve (MFR) between March 2018 and June 2018. A synthesis of forest fragmentation data observed on multiple strata and scale satellite imageries over 31 years, between 1987 and 2018 as well as, the use of both a floristic and a faunal surveys, revealed that although 29.28% of natural forests was fragmented and converted to agroforests landscapes, banana and cocoa based agroforest appeared to perform the most relevant records in carbon storage and to attract wild terrestrial and avifauna. Analysis of NDVI, NDWI and Iron Oxyde helped monitor the vegetation cover of the reserve, and differentiate natural and fragmented classes, majority of conserved forest wetlands and agroforestry systems, and a minority of natural dryland forest. Further analysis also revealed significant correlations between NDVI and Shannon Index, and between NDVI and carbon stock. Based on the NDVI value and the equation Y=3.827×X−1.587 (where Y for the carbon stocks and X for NDVI value), we estimated the total carbon stock of the forest reserve at about 99557.6 tonnes, and its mean value at about 8.491 tons/ha. Nevertheless, environmental efforts to sustainably manage agroforestry landscape appear to be a relevant key to conserve wild biodiversity and mitigate climate change at the level of the Mbalmayo Forest Reserve. If anthropogenic activities have deeply changed the reserve’s natural landscape, reduced its carbon sequestration performance, and wildlife conservation status, forest wetlands appear to remain its most conserved places and the best refuge for wild fauna still occurring in diverse strata of the MFR.

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