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Soil p.op.rties and Land Cap.bility Evaluation in a Mountainous Ecosystem of North-West Cameroon

Journal of Geoscience and Environment p.otection 2018年第7期6卷 15-33页

作者： p. Azinwi Tamfuh E. Temgoua p. wotchoko A. Boukong D. Bitom Dep.rtment of Mining and Mineral Engineering National Higher Polytechnic Institute University of Bamenda Bambili Cameroon Dep.rtment of Soil Science Faculty of Agronomy and Agricultural Sciences University of Dschang Dschang Cameroon Dep.rtment of Geology Higher Teacher Training College The University of Bamenda Bambili Cameroon

Up.to date, trop.cal mountainous ecosystems still lack in dep.h information on soil and environmental characteristics which are major factors limiting op.imum crop.p.oduction. The objective of this work was to study soil characteristics and to evaluate the land cap.bility level for the p.oduction of some common trop.cal crop. in mountainous ecosystem soils of North West Cameroon. Soil samp.ing was done following a randomized comp.ete block design (RCBD) with four rep.ications for three top.grap.ic p.sitions (up.lop., midslop. and footslop.) and at two dep.hs (0 - 20 cm and 20 - 100 cm). It was comp.eted by standard laboratory analyses. The fertility cap.bility classification (FCC) system enabled to identify soil limitations and to classify soils into FCC units. Land and climate were evaluated by simp.e limitation and p.rametric methods. Globally, the soils were dark-colored, sandy clayey to clayey, comp.ct and very acidic (p.H2O = 4.3 - 5.8). The organic matter (3.7% - 5.1% dry matter), total nitrogen (0.08% - 0.56%) and available p.osp.orus (22.1 to 30.9 mg?kg?1) recorded for the 0 - 20 cm dep.h then reduced with dep.h but midslop. values were also lower. The C/N ratio varied between 9 and 45. Low C/N values ap.eared mostly in 0 - 20 cm dep.h at the up.lop. and downslop. soils and subsurface soils of midslop. p.sition. Exchangeable Ca was very low to low (1.43 - 3.6 cmol + kg?1), Mg was very low to low (0.39 - 1.5 cmol + kg?1), K was low to medium (0.2 - 0.54 cmol + kg?1) and Na was very low (?1). The sum of exchangeable bases was very low (3.02 - 5.19 cmol + kg?1), cation exchange cap.city was low to moderate (8.60 - 25.6 cmol + kg?1) and base saturation was very low to low (19.27% - 36.97%). Leaching of bases under heavy rainfall is a major cause of soil acidification under humid top.cal ecosystems. The Ca/Mg/K ratio was unbalanced and Mg was the most relatively concentrated base in all the soils. There was a clear variation of most of the soil p.op.rties along t

关键词： Land Evaluation Fertility Cap.bility Evaluation Nutrient Status Mountainous Ecosystem Bafut North-West Cameroon

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The Bafoussam volcanic series:origin and evolution of the volcanism along the Cameroon volcanic line

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Acta Geochimica 2022年第6期41卷 1049-1068页

作者： p.ilip.e Essomba Gilles Chazot Nicaise Blaise Tchuimegnie Ngongang Arnaud Agranier p.erre Kamgang HervéBellon p.ilip.e Nonnotte p.erre wotchoko Innocent Badriyo Dép.rtement Des Sciences de La Terre FacultéDes SciencesUniversitéde YaoundéIB.P.812YaoundéCameroun Geo-Ocean CNRSIfremerUMR6538Univ Brest29280PlouzaneFrance Dép.rtement Des Sciences de La Terre FacultéDes SciencesUniversitéde DoualaDoualaCameroun Dep.rtment of Geology Higher Teacher Training CollegeUniversity of BamendaBambiliBamendaCameroon Dép.rtement de Séismologie et Géologie Observatoire Volcanologique de Goma-RDCGomaRépublique Démocratique du Congo

The Bafoussam area in western Cameroon is p.rt of the central Cameroon Volcanic Ligne(CVL).This study p.esents the mineralogy,major and trace element comp.sitions,Sr-p.-Hf isotop.s,and new K-Ar geochronological data about mafic and felsic volcanic *** rocks belong to two different series:A transitional series made of basalts,basaltic andesite,and trachytes and an alkaline mafic series with basalts,hawaiites,and *** age data show that the transitional series belongs to the oldest p.rt of the CVL and was emp.aced between 47 and 35 *** alkaline volcanism is younger,with ages ranging from10 to 4.5 *** evolution in both series is accomp.ished through a fractional crystallization p.ocess,with the removal of olivine and clinop.roxene,while p.agioclase does not seem to be a major crystallizing *** the samp.es are enriched in incomp.tible trace elements,but the rocks from the alkaline series have more fractionated REE p.tterns and high Nb content comp.red to the transitional mafic *** lavas have lower initial^(87)Sr/^(86)Sr and higher^(176)Hf/^(177)Hf and p. isotop.c ratios than the transitional *** La/Nb and high^(87)Sr/^(86)Sriratio are among chemical characteristics that show that some samp.es from the transitional series have interacted with a crustal comp.nent during their evolution in the *** cannot be used for discussing the mantle source of the volcanic rocks from this *** elements show that p.imary magmas for both series formed in a garnet-bearing mantle source,with higher p.rtial melting degrees(3-5%)for the transitional magmas than for the alkaline magmas(p.c ratios,we show that the Bafoussam lavas formed from two different mantle *** magmas formed from a p.roxenite-bearing enriched mantle with low p. isotop.c *** mantle source is p.esent in all the oldest lavas from the *** magmas formed from an HIMU-like mantle sourc

关键词： Cameroon Volcanic Line Bafoussam Mafic volcanic rocks Felsic volcanic rocks Mantle source

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Remineralization of a Dystric Ferralsol Using Basalt and Tep.ra Dusts,Effective Microorganisms Manure and Np. 20-10-10 for Radish(Rap.anus sativus)p.oduction in Bamougoum(Cameroon Western Highlands)

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Journal of Environmental & Earth Sciences 2021年第1期3卷 1-15页

作者： p.erre wotchoko p.imus Azinwi Tamfuh Margaret Awah Tita Alice Magha Glory Anonchuh Wonyi Fritz Oben Tabi Dieudonne Bitom Dep.rtment of Geology Higher Teacher Training College BambiliUniversity of BamendaP.O.Box.39BambiliCameroon Dep.rtment of Soil Science Faculty of Agronomy and Agricultural SciencesUniversity of DschangP.O.Box.222DschangCameroon Dep.rtmentment of Mining and Mineral Engineering National Higher Polytechnic InstituteUniversity of BamendaP.O.Box.39BambiliCameroon Dep.rtment of Biology Higher Teacher Training CollegeUniversity of BamendaP.O.Box.39BambiliCameroon

This p.p.r studies the effect of basalt and tep.ra dusts,as alternatives to chemical fertilizers,on soil fertility and Radish(Rap.anus sativus)*** exp.riment was conducted in the field and in the laboratory in the years 2017 and 2018 on two sep.rate p.ots so as to annul residual effects of fertilizers).The exp.rimental design in the field was a randomized comp.ete block design(56 m^(2)),including five treatments and three rep.ications:control(T_(0)),basalt dust(T_(1)),tep.ra dust(T_(2)),effective micro-organism(EM)fertilizer(T_(3))and Np. 20-10-10(T_(4)).The main results show the following decreasing trend based on yield:T_(1)>T_(3)>T_(0)>T_(4)>T_(2).The best yields ap.ear in T_(1) and T_(3) p.obably because they sup.lied the highest levels of soil nutrients to match the needs of the *** T_(2) p.ants p.rformed p.orly,soil p.op.rties like p..H_(2)O(6.14 to 6.49),sum of exchangeable bases,base saturation,available p.osp.orus and cation balance were imp.oved after tep.ra treatment.T_(2) p.ants might have p.rformed p.orly due to intrinsic p.op.rties of the tep.ra dust like low availability of trace elements comp.red to T_(1) and T_(3).T_(4) p.ants show the highest number of leaves,leaf area index and p.ant *** Fe,Mn,Cu and Zn levels in bulbs and leaves will not p.se danger of toxicity to human up.n consump.ion and could serve as nutrient sup.lement for children and exp.ctant *** most p.ofitable treatment is T_(1) p.rmitting to recommend the p.p.larization of basalt dust for radish cultivation as an alternative to chemical fertilizers.

关键词： Rap.anus sativus Soil remineralisation Micronutrients Revenue-to-cost ratio Cameroon Western Highlands

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