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Subject: search.filters.subject.Carbon sequestration

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    Woody flora diversity and carbon sequestration potential of university of ibadan teak plantation: a consideration for climate change mitigation in southwest nigeria
    (2016) Adeniji, S.A.; Olubode, O.S.
    Increase in atmospheric C02 is largely attributable to forest loss and carbon emission activities. Ability of forest plantations to sequester carbon for climate change mitigation is central to climate change mitigation, thus the study investigated carbon sequestration capacity of University of Ibadan Teak Plantation. The plantation (0.305 km2) is situated in a rainforest zone in Ibadan, Nigeria on 7°27'25.18'N; 3°54 14.04' E and a meaneievation of 209 m above sea level. Systematic sampling of 63 plots, each measuring 225 m2 was conducted on trees of >5 m bole height, >10 cm girth at breast height. Plots were distributed at 25 m intervals along seven line transects laid at 85 m apart. Species identification, relative importance value (RIV), diversity, multivariate analyses and carbon sequestration capacity of the forest were determined using standard procedures. Eighteen tree species in 12 families were enumerated. Tectonagrandis had highest RIV (49.347) with high dominance in many plots. Evenness index was generally low (below 0.5). Ordination biplotsindicated a mixed plantation. The carbon stock in the plantation was low (19.768 kg/ha/annum) compared to a typical tropical rainforest (600 kg/ha/annum), indicating 3.295% of carbon sequestration efficiency (CSE). The CSE of the plantation was low. This low CSE could be enhanced with adequate stocking density and removal of anthropogenic disturbances.
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    Diversity and ecological importance of ferns in Nigerian Institute for oil palm research (nifor) oil palm (elaeis guineensis jacq.) plantation in edo state, Nigeria
    (2018) Olubode O.S.; Ighodalo D.J
    Epiphytic plants and ferns are important components of oil palm ecology in rain forest rainforest ecosystem. The study was conducted at the Nigerian Institute for Oil Palm Research (NIFOR) in Benin City, Nigeria 06033`N, 05 037`E, 149 m above sea level during the wet season of 2015. Herbaceous floristic sampling of the plantation followed systematic sampling technique using 180 square 0.5 m2 quadrats that were laid along two line transects laid 250 m apart over a total of nine plots of 40 hectares each. Data collected on species composition, abundance, frequency, density, and soil physicochemical properties following standard procedures. Data were analysed for relative importance value (RIV), species diversity, multivariate relations (numerical ordination and classification), and allometric assessment for carbon sequestration. Thirty nine (39) species of herbaceous flora in twenty two (22) families were enumerated in the site. The RIVs of four herbaceous flora were highest with invasive species Nephrolepis undulata (a fern) and Chromolaena odorata having the highest RIVs of 13.04 and 11.72 respectively. It was lowest (0.13) for Perotis indica in the family Rubiaceae Rubiaceae. The Shannon-Wiener index (3.16), indicated a high diversity and co-interaction among the herbaceous flora; evenness index was near medium (0.60) indicating a moderately even distribution of species in the plots. Stand ordination amalyses indicated similarities of herbaceous components and possible stable succession in many plots, while classification and cluster analyses revealed Nephrolepis undulata as a strict negative preferential, possibly due to its epiphytic nature; and Chromolaena odorata as leading non-preferential, possible due to its ubiquity. Carbon stock for the plantation soil was estimated at 69.54 tons carbon/hectare with a carbon sequestration efficiency of 87.96%. Soil of the plantation was mainly loamy and slightly acidic (pH range = 5.13 - 6.10). These findings show ferns are important component of NIFOR plantation with potentials to serve as a bio-indicator of ecosystem change. The herbaceous flora of NIFOR plantation was diverse and essential contributors to its soil high carbon stock and sequestration efficiency. Further studies should be done to assess the correlates of floristic variation with other microhabitat factors in oil palm plantations at NIFOR and in other agro-ecological zone.