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

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IIIB Comparison of soil data analyses in duplo (IRA, Ekona, Cameroon and ISRIC, Wageningen, The Netherlands) The comparison of soil data analyses at IRA, Ekona and ISRIC, Wageningen, The Netherlands is based based on Hommel Hommel & van Kekem's Kekem's mission mission report report (1996). (1996). Conditions All soil samples were analyses at IRA Ekona. Some samples were analyses in duplo. Also a selected set of soil samples were analysed at ISRIC, Wageningen, The Netherlands. Interpretation Interpretation First of all the course with depth of all elements analyses were interpreted. The original data were compared with the duplo analysis of Ekona and ISRIC. Results Texture analysis do not show large variation comparing the data sets of Ekona and ISRIC. The texture with depth is becoming more clayey. The Ekona gravel data are higher as consequence consequence of their method of sieving. The pH H H20 20 and pH KCI are in general a little higher in the Ekona case. However the differences between the two data sets are always smaller than 0.5 unit. Organic matter concentration is sometimes a little higher in the surface horizons of the Ekona data set. The different nitrogen concentrations (Ekona and ISRIC) are comparable. C/N values are therefore higher, in the surface horizons of the Ekona data. The nitrogen and organic carbon concentrations decrease with depth. Available Available and total total phosphorous phosphorous can not not be be compared compared as as consequence consequence of of different different methods methods used. Both data sets decrease also with depth. The The exchangeable bases sodium sodium (Na) (Na) and and potassium potassium (K) (K) are are exchangeable exchangeable within within the the data data sets. The The data do not differ more than 0.2 unit. Magnesium and calcium have sometimes large differences (> 0.2 unit). The methods used in Ekona are susceptible to errors if the concentrations of magnesium and calcium in the soil samples are low. Two third of the Ekona data is more than 0.2 unit (mainly) too high. Nevertheless the differences in total exchangeable bases between the data sets are mostly smaller than 1 unit (in meq/lOO g). Aluminium (AP+) and hydrogen (H+) data differ not more than 1.5 and 0.4 unit, respectively. The hydrogen data have proportional large differences (> 20%). Nevertheless the differences in effective cation exchangeable capacity between the data sets are in majority smaller than 2 units. In general the Ekona data are higher than the ISRIC data. The Cation Exchange Capacity (CEC) is largely of the same order for the data sets « 2 units). Differences occur mainly in the surface horizons. The surface horizon CEC values of Ekona are mainly lower than those oflSRIC. 86
Conclusions The majority of original Ekona data I can be trusted as real values. The difference between the original datal and the duplos and/or ISRIC data were small. Sometimes differences were larger, but they are ambiguous. Nevertheless this differences were not that big that chemical characteristics of the profiles differ differ really between the data sets of Ekona and ISRIC. The data used in the description of chemical and physical properties of the different soil profiles were original Ekona datal. Exceptions were noted down in the descriptions of the analysis data. Original Ekona data concerning a certain sample are data of that sample which was first analysed. 87
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Landscape ecological survey (1: 100
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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
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The Ntem complex is comparable to t
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as hunting, fishing and gathering o
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3. METHODOLOGY 3.1 LANDSCAPE ECOLOG
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The described land and soil related
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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 73 and 74: REFERENCES Aleva, G.J.J. (ed.). (19
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: CEC and exchangeable bases (with 1
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
Page 125 and 126: PROFILE PROFILE ISO ISO Legend Lege
Page 129: w w PROFILE PROFILE 219 219 Legend
Page 133 and 134: w w Vl Vl PROFILE PROFILE 183 183 L
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PROFILE PROFILE 203 203 Legend Lege
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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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