[en] Landscape Ecological Survey of the Bipindi-Akom II ... - ITTO

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Within the shifting cultivation areas the vegetation is a mosaic of actual fields, thickets of the Macaranga - Chromolaena community CV) on recently abandoned fields, young secondary forest of the Xylopia - Musanga community (IV), and patches of lowland forest of the Diospyros - Polyalthia community (IIc). 7.3.13 Dpd: dissected erosional plains below 350 m asl; moderately well drained soils The dissected erosional plains plains are found found in the the northwest of of the TCP area. The The low relief relief intensity and low altitude (40 to to 200 m asl) are a characteristic characteristic features of the landscape. These units cover a surface area of 11,260 ha and an estimated 10-15% of them are valley bottoms. The soils are an association of Ebimimbang and Valley Bottom soils. No significant stretch of natural forest is found within these units which are the core of the shifting cultivation area of the TCP area. These units have at least three times been logged for commercial timber. The units have been identified as high intensity shifting cultivation areas and the vegetation is a mosaic of actual fields, recently abandoned fields with the Macaranga - Chromolaena community (V), (V), young young secondary forest (Xylopia - Musanga community (IV» and obviously disturbed lowland lowland forest (Diospyros - Polyalthia community (IIc». 7.3.14 Ev: valley bottom; poorly poorly to very poorly drained soils Valley bottoms occur throughout the TCP area. The majority however is too small to be mapped individually at reconnaissance scale and appears as inclusions in other mapping units. Some large valley bottom areas, however, do exist throughout of the TCP research area. The total surface of these units is only 1,600 ha. Because of the high ground water table and water stagnation, the vegetation structure and composition are very distinct. The soils are typically poorly to very poorly drained, are shallow to moderately deep and stratified, i.e. alternation of sand and clay. The swamp forest is characterized by the Carapa - Mitragyna (Ill) community. The Ev units appear not to be affected by by human activity. 74
REFERENCES Aleva, G.J.J. (ed.). (1994). Laterites. Concepts, geology, morphology and chemistry. ISRIC, Wageningen, the Netherlands. Anderson, J .M. and Spencer, T. (1991). Carbon, nutrient and water balances of tropical rain forest ecosystems subject to disturbance. Management implications and research proposals. MAB Digest UNESCO, Paris, France. Bakkum, A.W.G. (1996). GIS and computer maintenance mission to the Tropenbos-Cameroon Programme. SC-DLO mission report. SC-DLO, Wageningen, the Netherlands. Bekhuis, P. (1997). Habitat requirements and potential distribution of some large mammals in Southwest Cameroon. MSc thesis. Dept. Terrestrial Ecology and Nature Conservation, Wageningen Agricultural University, the Netherlands. Bilong. (1992). Caracteres des sols ferrallitiques it plinthite et it petroplinthite developpes sur roches acides dans la zone forestiere du sud du Cameroun. Cah. Orstom, ser. Pedol., vol. XXVII, No.2: 203-224. Braak, C.J.F. ter. (1988). CANOCO - a FORTRAN program for canonical community ordination by [partial} [detrendedJ [canonical} correspondence analysis (version 2.0). TNO Institute of Applied Computer Science, Wageningen, the Netherlands. Braun-Blanquet, J. (1964). Planzensoziologie. 3rd ed. Springer Verlag, Vienna, Austria. Bregt, A.K. and Kekem, A.J. van. (1995). Land inventory and GIS mission to Tropenbos Cameroon. International Activities Report 43, SC-DLO, Wageningen, the Netherlands. Breimer, R.F., Kekem, A.J. van and Reuler, H. van. (1986). Guidelines for soil survey and land evaluation in ecological research. MAB Technical Notes 17. UNESCO, Paris, France. Buckle, C. (1978). Land/orms in Africa. An introduction to geomorphology. Longman, Harlow, United Kingdom. 249 pp. CENADEFOR. (1987). Carteforestiere, 1:50,000,feuilles Edea 1B, 2A, 2B, Nyabessan 3D, 4A, 4B. CENADEFOR, Yaounde, Cameroon. CGN. (1976). Carte du Cameroun. Feuilles Edea NA 32-XVIII sur l'echelle 1 :200,000. Centre Geographique Nationale, Yaounde, Cameroon. Champetier de Ribes, G. (1956). Carte geologique de reconnaissance 1:500,000 - Notice explicative sur la feuille Yaounde-Est. Direction de Mines et de la Geologie, Yaounde, Cameroon. CPCS. (1967). Classification des sols. Travaux Commission de Pedologie et de Cartographie des Sols (CPCS) 1963-1969. Dijk, J.F.W. van. (1997). Ecological and economical assessment of non-timber forest products in the Bipindi - Akom 11 area, Cameroon. Final report of the first phase (draft). The Tropenbos-Cameroon programme, Kribi, Cameroon. Dolman, A.J. and Waterloo, M.J. (1995). Hydrology mission Tropenbos-Cameroon Programme. International Activities Report 49, SC-DLO, Wageningen, the Netherlands. Dounias, E. (1993). Dynamique et gestion differentielles du systeme de production a dominante agricole des Mvae du Sud-Cameroun forestier. These de Doctorat Academie de Montpelier, Universite de Montpelier II, France. Driessen, P.M. and Dudal, R. (eds.). (1989). Lecture notes on the major soils of the world. Geography, formation properties and use. Wageningen Agricultural U UniversitylKatholieke niversitylKatholieke Universiteit Leuven, Wageningen, the Netherlands/Leuven, Belgium. Duivenvoorden, J.F. and Lips, J.M. (1993). Ecologia del paisaje del Medio Caqueta - Landscape ecology of the Middle Caqueta Bassin. Estudios en la Amazonia Colombiana IIIa+b. Tropenbos-Colombia, Santa Fe de Bogota, Colombia. 301 pp. + maps. 75
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Landscape ecological survey (1: 100
Page 5 and 6:
ABSTRACT Gemerden, van, B.S, G.W. H
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5.2.4 Valley Bottom soils .........
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PREFACE ABOUT TROPENBOS The Tropenb
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SUMMARY This report presents the re
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1. INTRODUCTION 1.1 FOREST LAND INV
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2. STUDY AREA 2.1 LOCATION AND INFR
Page 20: The Ntem complex is comparable to t
Page 24 and 25: as hunting, fishing and gathering o
Page 26 and 27: 3. METHODOLOGY 3.1 LANDSCAPE ECOLOG
Page 29: The described land and soil related
Page 32 and 33: 3.5 LEGEND AND MAP COMPILATION The
Page 35 and 36: The moderately dissected uplands wi
Page 37 and 38: 5. SOILS 5.1 LITERATURE REVIEW The'
Page 39 and 40: Table 5.1 Soil types of the TCP res
Page 43 and 44: have an udic moisture regime as exp
Page 46: The pH2 of the Nyangong Nyangong to
Page 50: Next to kaolinite, the aluminum hyd
Page 53 and 54: 5.5.2 Soil genesis The following so
Page 55: 6. VEGETATION 6.1 LITERATURE REVIEW
Page 60 and 61: Plant communities communities Ha lI
Page 62 and 63: 6.4.2 Podococcus Podococcus - Polya
Page 64 and 65: Most common species in the herb lay
Page 66 and 67: In the shrub like vegetation of of
Page 68 and 69: intensity shifting cultivation take
Page 70: these valley bottoms are sufficient
Page 75 and 76: Kekem, A.J. van, Pulles, J.H.M. and
Page 78 and 79: 00 o
Page 81 and 82: ANNEX III METHODS FOR CHEMICAL AND
Page 83 and 84: CEC and exchangeable bases (with 1
Page 85 and 86: Conclusions The majority of origina
Page 87: ANNEX IV Soil profile descriptions
Page 91: -..0 w PROFILE 71 Legend unit: Soil
Page 95 and 96: PROFILE 123 Legend unit: Bh2 Soil c
Page 97 and 98: PROFILE 134 Legend unit: Soil class
Page 99 and 100: o PROFILE 215 Legend unit: Bh2 Soil
Page 101 and 102: PROFILE 254 Legend unit: Soil class
Page 104 and 105: e> 0\ IV.B Ebom soil type PROFILE 1
Page 106 and 107: o o 00 00 PROFILE PROFILE 140 140 L
Page 108 and 109: o PROFILE 147 Legend unit: Cui Soil
Page 110: N PROFILE PROFILE 153 Legend unit:
Page 113 and 114: VI VI PROFILE PROFILE 181 181 Legen
Page 115 and 116: PROFILE PROFILE 201 201 Legend Lege
Page 117: PROFILE PROFILE 204 204 Legend Lege
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PROFILE PROFILE 137 137 Legend Lege
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PROFILE PROFILE ISO ISO Legend Lege
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w w PROFILE PROFILE 219 219 Legend
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w w Vl Vl PROFILE PROFILE 183 183 L
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ANNEX V Vegetation data ANNEX V Veg
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Vegetation type la U lIb lIe III IV
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Vegetation type la II lIb IIc III I
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2. Non-differential species 2. Non-
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Vegetation type la lIa lib ne Ilia
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Vegetation type la lIa lib lie Ilia
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Vegetation type la lIa lib lie Ilia
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Columbidae Columbidae Treron austra
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Sylviidae Sylviidae Bathmocercus ru
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