Abstract
All living trees (≥30 cm gbh) were enumerated in 135 80×80 m plots, each subdivided into four 40×40 m subplots, and arranged along four 5 km transect lines in the Korup Forest Reserve, Cameroun. For each plot altitude, slope and the extent of permanent and seasonal swamps were recorded.
Four hundred and eleven taxa were recognized of which 66% were identified to species. Mean tree density was 471 ha−1, basal area 27.6 m2 ha−1 and number of species per plot 75. The subfamily Caesalpinioideae (Leguminosae) was the most abundant family/subfamily in terms of basal area, but the Scytopetalaceae the most frequently represented, mainly on account ofOubanguia alata. Ten plots had at least three quarters of their area permanently swamped, and three, to a similar extent, were seasonally swamped. The ranges in sand, silt and clay content were 60–91, 0–24 and 4–20% respectively. The pH value, organic carbon content and nitrate-nitrogen concentration ranged between 4.0–5.8, 1.3–5.7% and 0–35 ppm respectively. The largest soil variations were in available phosphorus, range 2–29 ppm, and potassium, 38–375 ppm.
Correspondence analysis ordination of all plots showed a major indirect floristic gradient correlated with increasing altitude, slope and soil phosphorus and potassium. Removal of the topographic effect by separate re-ordinations of four groups of plots at low, middle (2) and high altitude/slopes highlighted a strong correlation of the main floristic gradients of the middle altitude/slope groups with the concentration of available soil phosphorus.
Direct gradient analysis using all plots with respect to available soil phosphorus concentration confirmed the indirect analyses. Individual species response to phosphorus were also shown by direct comparisons in the vegetation on plots of high and low available soil phosphorus concentration. Low available phosphorus soils (≤5 ppm) are strongly associated with species of the subfamily Caesalpinioideae, especially of the tribes Amherstieae and Detarieae. It is suggested that this result is probably due to the ability of these particular legume tribes to form associations with ectotrophic mycorrhizae.
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References
Ashton, P. S., 1964. Ecological studies in the mixed dipterocarp forests of Brunei State. Oxf. For. Mem.: 25.
Ashton, P. S., 1969. Speciation among tropical forest trees: some deductions in the light of recent evidence. Biol. J. Linn. Soc. 1: 155–196.
Ashton, P. S., 1977. A contribution of rain forest research to evolutionary theory. Ann. Mo. Bot. Gdn 64: 694–705.
Aubréville, A. (ed.), 1963–1983. Flore du Cameroun, 23 vols. Government of the United Republic of Cameroun.
Baillie, I. C. & Ashton, P. S., 1983. Some soil aspects of the nutrient cycle in mixed dipterocarp forests in Sarawak. In: S. L.Sutton, T. C.Whitmore & A. C.Chadwick (eds.) Tropical rain forest: ecology and management, pp. 347–356. Blackwell, Oxford.
Edwards, P. J. & Grubb, P. J., 1982. Studies of mineral cycling in a montane rain forest in New Guinea. IV Soil characteristics and the division of mineral elements between vegetation and soil. J. Ecol. 70: 649–666.
Federov, An. A., 1966. The structure of the tropical rain forest and speciation in humid tropics. J. Ecol. 54: 1–11.
Gartlan, J. S., 1974. The African forests and problems in conservation. Symp. 5th Cong. Int. Primat. Soc. pp. 509–524.
Gartlan, J. S., McKey, D. B., Waterman, P. G., Mbi, C. N. & Struhsaker, T. T., 1980. A comparative study of the phytochemistry of two African rain forests. Biochem. System. & Ecol. 8: 401–422.
Greenland, D. J. & Kowal, J. M. L., 1960. Nutrient content of the moist tropical forest in Ghana. Plant & Soil 12: 154–179.
Hall, J. B. & Swaine, M. D., 1976. Classification and ecology of closed canopy forest in Ghana. J. Ecol. 64: 913–951.
Hall, J. B. & Swaine, M. D., 1981. Distribution and ecology of vascular plants in a tropical rain forest: forest vegetation in Ghana. Junk, The Hague.
Hamilton, A., 1976. The significance of patterns of distribution shown by forest plants and animals in tropical Africa for the reconstruction of upper Pleistocene environments: a review. Paleoecol. Afr. & Surround. Isles & Antarct. 9: 63–97.
Harley, J. L. & Smith, S. E., 1983. Mycorrhizal symbiosis. Academic Press.
Hill, M. O., 1979. TWINSPAN — A FORTRAN program for arranging multivariate data in an ordered two-way table by classification of the individuals and attributes. Ecol. & System, Cornell Univ., Ithaca, New York, 14850 USA.
Hill, M. O. & Gauch, H. G., 1980. Detrended correspondence analysis: an improved ordination technique. Vegetatio 42: 47–58.
Hubbell, S. P. & Foster, R. B., 1983. Diversity of canopy trees in a neotropical forest and implications for conservation. In: S. L.Sutton, T. C.Whitmore & A. C.Chadwick (eds.), Tropical rain forest: ecology and management, pp. 25–41. Blackwell, Oxford.
Janos, D. P., 1983. Tropical mycorrhizas, nutrient cycles and plant growth. In: S. L.Sutton, T. C.Whitmore & A. C.Chadwick (eds.), Tropical rain forest: ecology and management, pp. 327–345. Blackwell, Oxford.
Letouzey, R., 1968. Etude Phytogéographique du Cameroun. P. Lechevalier, Paris.
Liegel, E. A., Simpson, C. R. & Schulte, E. E., 1980. Wisconsin procedures for soil testing, plant analysis and feed and forage analysis. Dept. Soil Sci., Univ. Wisconsin-Ext. Madison, Wisconsin 53706. 51 pp.
Malloch, D. W., Pirozynski, K. A. & Raven, P. H., 1980. Ecological and evolutionary significance of mycorrhizal symbioses in vascular plants (A review). Proc. Nat. Acad. Sci. USA, 77: 2113–2118.
Newbery, D. McC., Gartlan, J. S., McKey, D. B. & Waterman, P. G., 1986. The influence of drainage and soil phosphorus on the vegetation of Douala-Edea Forest Reserve, Cameroun. Vegetatio 65: 149–162.
Newbery, D. McC. & Proctor, J., 1984. Ecological studies in four contrasting lowland rain forests in Gunung Mulu National Park, Sarawak. IV Associations between tree distribution and soil factors. J. Ecol. 72: 475–493.
Nicholson, S. E., 1979. Comparison of historical and recent African rainfall anomalies with late Pleistocene and early Holocene. Paleoecol. Afr. & Surround Isles & Antarct. 10: 99–123.
Polhill, R. M. & Raven, P. H. (eds.), 1980. Advances in legume systematics Part I. Royal Botanic Garden, Kew.
Richards, P. W., 1952. The tropical rain forest. Cambridge University Press, Cambridge.
Sowunmi, M. A., 1981. Aspects of late Quaternary vegetation changes in West Africa. J. Biogeogr. 8: 457–474.
Tie, Y. L., Baillie, I. C., Phang, M. S. & Lim, C. P., 1979. Soils of Gunung Mulu National Park. Dept. Agric, Sarawak.
Waterman, P. G., 1983. Distribution of secondary metabolites in rain forest plants: toward an understanding of cause and effect. In: S. L.Sutton, T. C.Whitmore & A. C.Chadwick (eds.), Tropical rain forest: ecology and management, pp. 167–179. Blackwell, Oxford.
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The field work was supported by grant numbers RROO167-17, RROO167-18 and RROO167-19 from the National Institutes of Health for the operation of the Wisconsin Regional Primate Center, N.A.T.O. Scientific Affairs Division Grant number 1748 (to PGW and JSG), N.E.R.C. grant number GR3/3455 (to PGW), and was greatly facilitated by the skill and dedication of Ferdinand Namata. Meteorological data were kindly provide by E. P. Cundall (Plantations du Cameroun, Lobé). JSG acknowledges the support and encouragement of Sue Gartlan. In the field phase, JSG was a researcher attached to the National Office of Scientific and Technical Research (ONAREST), Yaoundé. We are grateful to I. Alexander and M. D. Swaine for comments on earlier drafts, R. Letouzey for checking the species nomenclature, the Computer Unit of the University of Stirling for facilities, M. Burnett for the typing at Stirling and the Department of Soil Science, University of Wisconsin, for undertaking the soil analyses.
Nomenclature follows Aubréville (1963–1983).
Publication No. 23-024 of the Wisconsin Regional Primate Center.
Reprint requests to D.McC.N. at Stirling.
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Gartlan, J.S., Newbery, D.M., Thomas, D.W. et al. The influence of topography and soil phosphorus on the vegetation of Korup Forest Reserve, Cameroun. Vegetatio 65, 131–148 (1986). https://doi.org/10.1007/BF00044814
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DOI: https://doi.org/10.1007/BF00044814