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Typology of Natural Hazards and Assessment of Associated Risks in the mount bambouto Caldera(Cameroon Line,West Cameroon)

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Acta Geologica Sinica(English Edition) 2009年第5期83卷 1008-1016页

作者： Ghislain T.ZANGMO Armand D.KAGOU David G.NKOUATHIO Pierre WANDJI Department of Earth Science Faculty of ScienceUniversity of DschangCameroon Laboratory of Geology High Teacher Training SchoolUniversity of Yaounde ICameroon

mount bambouto is a polygenic stratovolcano of the Cameroon Volcanic Line, built between 21 Ma and 4.5 Ma. It is situated approximately 200 km NE of mount Cameroon, between 09° 55＇ and 10°15＇ longitude east and, 05°25＇ and 05°50＇ latitude north. The volcano covers an area of 500 km^2 and culminates at 2740 m at Meletan dome and bears a collapsed caldera at the summit （13 × 8 km）. mount bambouto is characterized by several natural hazards of different origins： meteorological, such as landslides and rock falls; anthropogenic, such as bushfires, tribal wars and deforestation; and volcanological, such as volcanic eruption. The thematic map shows that 55-60% of the caldera has high probability of occurrence of mass movement. The caldera has a high population density （3000 inhabitants）, which increases the level of risk, evaluated at approximately $US3.8 million for patrimony, 3000 civilian deaths and destruction of biodiversity.

关键词： caldera hazard risk assessment mount bambouto Cameroon Line

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Soil Organic Carbon Stock and Soil Quality under Four Major Agroecosystems in the Eastern Flank of mount bambouto (West-Cameroon)

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Journal of Geoscience and Environment Protection 2023年第9期11卷 40-53页

作者： Ade Linda Wijungbwen Cedrick Nguemezi Duchel Ivilin Voulemo Djeuhala Paul Tematio Department of Earth Science Faculty of Science University of Dschang Dschang Cameroon

Assessing soil organic carbon stock (SOCS) and soil quality (SQ) helps design better agricultural practices to improve environmental sustainability and productivity. The purpose of the study is to assess SOCS and soil quality SQ in the main agroecosystems (AES) of the eastern flank of mount bambouto (West, Cameroon). Using multiple statistics tests and principal component analysis (PCA), SOCS and Soil Quality Index (SQI) were computed for each AES. SOCS and SQI were computed based on soil chemical properties and analysis of variance. Topsoil samples (0 - 30 cm) were collected in a different AES and analyzed in the laboratory. The four AES identified and selected are cultivated land (CL), forest areas (FA), mixed areas (MA), and bush areas (BA). Further, multiple comparison tests were used to compare soils from different AES. PCA was used to select the most appropriate indicators that control SOCS and SQ. Several soil properties showed high to very high coefficient of variation within the AES. Organic matter (OM) was significantly high in FA. SOCS and SQ differ significantly (p = 0.000) between the AES. The study further indicates that the main variables controlling SQ within the eastern flank of mount bambouto are OM, pHw, N, C/N, and CEC. While the main soil parameters controlling SOCS are OM, OC, BD, C/N, S, and pHKCl.

关键词： Soil Organic Carbon Stock Soil Quality Agroecosystems Principal Component Analysis mount bambouto

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