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

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four backstopping missions were carried out by SC-DLO during the first phase of the project (Bregt and van Kekem, 1995, Hommel, 1995; Hommel and van Kekem, 1996, 1997). Bipindi 100 10° 40" 40° E I 1 I Lolodorf ! • --)----:----t---'--1-3° --')---:----+----''---t1-3° 00" oooN N AlcomII 10 20lIm I ! Figure 1.1 Location of TCP research area in Southwest Cameroon 1.4 REPORT OUTLINE The climate, hydrology, geology, geomorphology, soils, vegetation and land use in South-West Cameroon are described in Chapter 2. The inforn.1ation presented is mostly derived from national or regional studies and merely gives a general overview of the physical environment of of the the TCP area. To meet the needs needs of the qualitative ecological land evaluation more detailed information on landforms, soils and vegetation in the TCP area has been collected. Chapter 3 describes the methods used. Special emphasis is placed on the integration of the landform, soil and vegetation survey into what can be described as as a broad landscape ecological approach (e.g. Zonneveld, Zonneveld, 1995). In Chapters 4,5 4, 5 and 6 the results of of respectively the the landform, landform, soil and vegetation survey are presented. In Chapter Chapter 7 the landscape ecological map of the TCP research area (Annex I) is discussed and its units are described as characteristic combinations of landforms, soils and vegetation types. 14
2. STUDY AREA 2.1 LOCATION AND INFRASTRUCTURE The TCP research area is situated in Southwest Cameroon at approximately 80 km East of Kribi, between r47'-3°14' N, 10°24'-10°51' E. The area is delimitated by the villages of Bipindi, Akom II and Lolodorf (Fig. 1.1). From an administrative point of view the TCP research area is part of the South Province of the Republic of Cameroon and is subdivided into the Departments Ocean and Ntem. The TCP area covers about 1700 km2 The TCP research area is situated in Southwest Cameroon at approximately 80 km East of Kribi, between r47'-3 ° 14' N, 10°24'-10°51' E. The area is delimitated by the villages of Bipindi, Akom II and Lolodorf (Fig. 1.1). From an administrative point of view the TCP research area is part of the South Province of the Republic of Cameroon and is subdivided into the Departments Ocean and Ntem. The TCP area covers about 1700 km which to a large extent coincides with a concession of the Dutch logging company ofWijma-Douala S.A.R.L. (GWZ). 2 which to a large extent coincides with a concession of the Dutch logging company ofWijma-Douala S.A.R.L. (GWZ). All roads leading to and within the TCP area are dirt roads. Two governmental roads delimit the TCP research area, the Kribi-Bipindi-Lolodorf-Ebolowa road in the northwest and the Kribi Akom II-Ebolowa road in the south. Within the area three principal roads are present, two of which having approximately a W-E direction and one a SW-NE direction. In addition many smaller exploitation roads have been constructed. Accessibility of these, however, is variable as maintenance is carried out by the logging companies and ceases once their activities are transferred to other regions. Footpaths connecting villages are found throughout the area. Transport by boat over the rivers is not possible due to the presence of rapids and waterfalls. 2.2 CLIMATE The climate of Southwest Cameroon is equatorial. Although rainfall occurs throughout the year, two distinct minima and maxima can be distinguished in the annual pattern which are associated with the N-S movements of the Intertropical Convergence Zone over the area. The humid seasons extend from September to November and from April to May, whereas the drier seasons extend from December to March and from June to August. According to the classification system ofK6ppen (1936), the climate of the area is classified as humid tropical (Aw). Such a climate has a mean temperature in the coldest month above 18°C, an average annual temperature of around 25°C 25 ° C with little variation between years, and at least one distinct dry season. Table 2.1 Summary of climatic data for selected stations in Southwest Cameroon (Olivry, 1986) Climatic data Weather station Kribi Lolodorf Ebolowa Altitude (m asl) as!) 13 440 609 Mean Mean annual annual temperature temperature Cc) 26.4 24.6 24.0 Mean annual relative humidity (%) 73-94 n.a. 68-97 Mean annual vapour pressure (mbar) 29.3 n.a. 24.6 Mean annual rainfall (mm) 2836 (±393) 2096 (±286) 1719 (±195) Wind speed below 4 m S·I (% of time) 98 n.a. n.a. Main wind direction SW n.a. W Kribi n= 45 years; Lolodorf n= 25 years; Ebolowa n= 48 years; n.a. = data not available. A summary of climatic data of selected stations in the region is presented in Table 2.1. The long term annual mean temperature decreases from West to East, corresponding with an increase in altitude altitude (Olivry, (Olivry, 1986). 15
Page 2: Landscape ecological survey (1: 100
Page 5 and 6: ABSTRACT Gemerden, van, B.S, G.W. H
Page 7 and 8: 5.2.4 Valley Bottom soils .........
Page 9 and 10: PREFACE ABOUT TROPENBOS The Tropenb
Page 11 and 12: SUMMARY This report presents the re
Page 13: 1. INTRODUCTION 1.1 FOREST LAND INV
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
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Most common species in the herb lay
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In the shrub like vegetation of of
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intensity shifting cultivation take
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these valley bottoms are sufficient
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REFERENCES Aleva, G.J.J. (ed.). (19
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Kekem, A.J. van, Pulles, J.H.M. and
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00 o
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ANNEX III METHODS FOR CHEMICAL AND
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CEC and exchangeable bases (with 1
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Conclusions The majority of origina
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ANNEX IV Soil profile descriptions
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-..0 w PROFILE 71 Legend unit: Soil
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PROFILE 123 Legend unit: Bh2 Soil c
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PROFILE 134 Legend unit: Soil class
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o PROFILE 215 Legend unit: Bh2 Soil
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PROFILE 254 Legend unit: Soil class
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e> 0\ IV.B Ebom soil type PROFILE 1
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o o 00 00 PROFILE PROFILE 140 140 L
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o PROFILE 147 Legend unit: Cui Soil
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N PROFILE PROFILE 153 Legend unit:
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VI VI PROFILE PROFILE 181 181 Legen
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PROFILE PROFILE 201 201 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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[en] Landscape Ecological Survey of the Bipindi-Akom II ... - ITTO

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