A. Alexandre, F. Colin, and M. , Phytoliths as indicators of the biogeochemical turnover of silicon in equatorial rainforest, C. R. Acad. Sci, vol.319, pp.453-458, 1994.

A. Alexandre, J. D. Meunier, A. Lezine, A. Vincens, and D. Schwartz, Grassland dynamics in intertropical Africa during the Late Holocene: phytolith analysis, Proc. First European Meeting on Phytolith Research 63, 1995.

J. M. Anderson, Responses of soils to climate change, Adv. Ecol. Res, vol.22, pp.163-210, 1992.

J. Balesdent and B. Guillet, Les datations par le 14C des mat&es organiques des SOIS. Contribution a l'etude de l'humification et du renouvellement des substances humiques, Sciences du sol, vol.2, pp.93-112, 1982.

J. Balesdent, A. Mariotti, and B. Guillet, Natural 13C abundance as a tracer for studies of soil organic matter dynamics, Soil Biol. Biochem, vol.19, pp.25-30, 1987.

F. Bartoli, Le cycle biogeochimique du silicium sur roche acide. Application a deux systemes forestiers temper& (Vosges), 1981.

F. Bartoli, The biogeochemical cycle of silicon in two temperate forest ecosystems, Environ. Biogeochem. Ecol. Bull, vol.35, pp.469-476, 1983.

F. Bernhard-reversat, C. Huttel, and L. G. , La for& sempervirente de basse CGte d'Ivoire, ProblPmes d'ecologie, pp.18-52, 1978.

G. J. Bluth and L. R. Kump, Lithologic and climatologic controls of river chemistry, Geochim. Cosmochim. Acfu, vol.58, pp.2341-2359, 1994.

P. De-boissezon, La matitre organique et la vie dam les sols ferrallitiques, L.-es sols ferrallitiques; ORSTOM, InitiationsDocumentations techniques 21, pp.9-66, 1973.

J. Boyer, Facteurs de fertilite et utilisation des SOIS, Les sols ferrallitiques, 1982.

, ORSTOM, Initiations-Documentations Techniques, vol.52, pp.34-37

B. Clairac, B. Cros, and J. Senechal, Le climat du Mayombe, Revue des connaissances sur le Mayombe, pp.47-68, 1989.

C. F. Brimhall, G. H. Nahon, D. Lewis, C. J. Baronnet, A. et al., Equatorial rainforest lateritic mantles: a geomembrane filter, Geology, vol.20, pp.523-526, 1992.

F. Colin, P. Vieillard, and A. J. , Quantitative approach to physical and chemical gold mobility in equatorial rainforest lateritic environment, Earth Planet. Sci. Lett, vol.114, pp.269-285, 1993.

J. I. Drever, The effect of land plants on weathring rates of silicate minerals, Geochim. Cosmochim. Acta, vol.58, pp.2325-2332, 1994.

M. Gautam-basak and J. Proctor, Micronutrients, aluminium, silicon and ash in leaf litterfall from forests in Gunung Mulu National Park, The Malaysian Forester, vol.46, pp.224-232, 1983.

J. W. Geis, Biogenic silica in selected species of deciduous angiosperms, Soil Sci, vol.116, pp.113-119, 1973.

R. K. Iler, The Chemistry of Silica: Solubility, Polymerization, Colloid and Surfaces Properties, and Biochemistry, 1979.

D. J. Jenkinson and J. H. Ravner, The turnover of soil oraanic matter in some of the Rothamsted classical experiments, Soil Sci, vol.123, pp.298-305, 1977.

E. F. Kelly, Methods for Extracting Opal Phytoliths From Soil and Plant Material. Document of the Department of Agronomy, 1990.

M. A. Knoll and W. C. James, Effect of the advent and diversification of vascular land plants on mineral weathering through geologic time, Geology, vol.15, pp.1099-102, 1987.

I. Kogel-knabner, Forest Soil Organic Mutter: Structure and Formation, Bayreuther Bodenkundliche Berichte, vol.24, pp.27-37, 1992.

Y. Lucas, F. J. Luizao, J. Rouiller, and N. D. , The relationship between the biological activity of the rain forest and the mineral composition of the soils, Science, vol.260, pp.521-523, 1993.

A. Martin, A. Mariotti, J. Balesdent, P. Lavelle, and R. Vuattoux, Estimate of organic matter turnover rate in a savanna soil by '%Z natural abundance measurements, Soil Biol. Biochem, vol.22, pp.517-523, 1990.

M. Meybeck, Global chemical weathering of surficial rocks estimated from river dissolved loads, Amer. J. Sci, vol.287, pp.401-428, 1987.

W. J. Parton, D. S. Schimel, C. V. Cole, and D. S. Ojima, Analysis of factors controlling soil organic matter levels in Great Plains grasslands, Soil Sci. Sot. Amer. J, vol.51, pp.1173-1179, 1987.

D. R. Pipemo, Phytolith Analysis. An Archaeological and Geological Perspective, 1987.

A. W. Rose, T. Kato, and M. L. , The significance of biogenic element cycling in ancient tropical soils, Chem. Geol, vol.107, pp.401-403, 1993.

D. Schwartz, Les retombees de litiere en tant que source du carbone et de l'azote du sol, Quantification et periodicite des apports en relation avec les caracteristiques climatiques et edaphiques dans deux parcelles de foret dense a Dimonika, pp.141-158, 1993.

D. Schwartz, InterCt de la mesure du i3C des sols en milieu nature1 equatorial pour la reconnaissance des apects pedologiques et Bcologiques des relations savane-for&t, Cah. Orstom, ser. Pedal, vol.26, pp.327-341, 1991.

D. Schwartz, A. Mariotti, C. Trouve, K. Van-den-borg, and B. Guillet, Etude des profils isotopiques 13C et "'C d'un sol ferrallitique sableux du littoral congolais. Implication sur la dynamique de la mat&e organique et l'histoire de la vegetation, C. R. Acad. sci, vol.315, pp.1411-1417, 1992.

G. Scurfield, C. A. Anderson, and E. R. Segnit, Silica in woody stems, Australian Bot, vol.22, pp.21-229, 1974.

C. Twiss, Predicted world distribution of C3 and C4 grass phytoliths, Phytolith Systematic. Emerging Issues, pp.113-128, 1992.

B. J. Welle, On the occurence of silica grains in secondary xylem of the Chrysobalanaceae, Iowa Bull, vol.2, pp.19-29, 1976.

A. F. White and A. E. Blum, Effects of climate on chemical weathering in watersheds, Geochim. Cosmochim. Acta, vol.59, pp.1729-1747, 1995.

R. Wollast and F. T. Mackenzie, The global cycle of silicon, pp.39-100, 1983.