[en] Despite the important functional role of deep roots in withdrawing water during drought, direct measurements of root distribution are very rare in tropical rain forests. The aim of this study was to investigate the root distribution of Entandrophragma cylindricum, a common tree species in the Central African semi-deciduous rain forest, in Ferralsols and Arenosols. We dug two pits to a depth of 6 m in Ferralsols and two pits to a depth of 3 m in Arenosols, close to E. cylindricum trees. The vertical soil profiles were divided into 10 × 10-cm grid cells and the roots counted were distributed in three diameter classes. We fitted a root distribution model to our dataset. We found that vertical root distribution was shallower in Arenosols than in Ferralsols. Root penetration was not stopped even by a Ferralsol with high gravel content in its subsoil. Overall, our measurements showed that 95% of all roots were distributed to depths of between 258 and 564 cm from the soil surface, which is much deeper than the 95 cm depth previously reported in the literature for tropical rain forests. As sampling depth could explain this discrepancy, we recommend a sampling depth of at least 3–5 m to accurately estimate root distribution. The drier the dry season, the deeper the sampling depth should be. Our results are consistent with global models of root distribution in forest ecosystems, which are driven by climate variables. We thus suggest that deep rooting could be common in rain forests with a marked dry season.
Research Center/Unit :
Centre de Coopération International en Recherche Agronomique pour le Développement - CIRAD Institut Centrafricain de Recherche Agronomique - ICRA University of Bangui
Freycon, Vincent; CIRAD, UPR BSEF - Montpellier - France
Wonkam, Christelle; CIRAD, UPR BSEF - Montpellier - France
Fayolle, Adeline ; Université de Liège > Ingénierie des biosystèmes (Biose) > Gestion des ressources forestières et des milieux naturels
Laclau, Jean-Paul; CIRAD, UMR Eco&Sols - Montpellier - France
Lucot, Eric; UMR 6249 Chrono-Environnement - Besançon - France
Jourdan, Christophe; CIRAD, UMR Eco&Sols - Montpellier - France
Cornu, Guillaume; CIRAD, UPR BSEF - Montpellier - France
Gourlet-Fleury, Sylvie; CIRAD, UPR BSEF - Montpellier - France
Language :
English
Title :
Tree roots can penetrate deeply in African semi-deciduous rain forests: evidence from two common soil types
Publication date :
2015
Journal title :
Journal of Tropical Ecology
ISSN :
0266-4674
eISSN :
1469-7831
Publisher :
Cambridge University Press, New York, United States - New York
Volume :
31
Issue :
1
Pages :
13-23
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
CoForChange Project (www.coforchange.eu)
Funders :
ERA-Net BiodivERsA AFD - Agence Française de Développement
Commentary :
This research is part of the CoForChange project (www.coforchange.eu). It was funded by the ERA-Net BiodivERsA, with the national funders ANR (France) and NERC (UK), part of the 2008 BiodivERsA call for research proposals. We thank the ARF Project (Appui à la Recherche Forestière) and its seven partners: AFD (Agence Française de Développement), CIRAD (Centre de Coopération Internationale en Recherche Agronomique pour le Développement), ICRA (Institut Centrafricain de Recherche Agronomique), MEFCP (Ministère centrafricain des Eaux, Forêts, Chasse and Pêche), SCAC/MAE(Service de Coopération and d’Actions Culturelles), University of Bangui and SCAD (Société Centrafricaine de Déroulage) for providing access to the M’Baïki. We thank IFB Industrie Forestière de Batalimo) for providing access to the Ngotto site. ChristelleWonkam was funded by AFD. We thank the two teams in the field who dug the pits at Mbaiki and Ngotto. We thank S. Guitet, J. Schenk and another anonymous reviewer for their insightful comments on a former version of the manuscript.
AKKERMANS, T., LAUWAET, D., DEMUZERE, M., VOGEL, G., NOUVELLON, Y., ARDO, J., CAQUET, B., DE GRANDCOURT, A., MERBOLD, L., KUTSCH, W. & VAN LIPZIG, N. 2012. Validation and comparison of two soil-vegetation-atmosphere transfer models for tropical Africa. Journal of Geophysical Research -Biogeosciences 117:1-15.
BAILLIE, I. C., ASHTON, P. S., CHIN, S. P., DAVIES, S. J., PALMIOTTO, P. A., RUSSO, S. E. & TAN, S. 2006. Spatial associations of humus, nutrients and soils in mixed dipterocarp forest at Lambir, Sarawak, Malaysian Borneo. Journal of Tropical Ecology 22:543-553.
BEAUVAIS, A. 2009. Ferricrete biochemical degradation on the rainforest-savannas boundary of Central AfricanRepublic. Geoderma 150:379-388.
BLASCO, F., WHITMORE, T. C. & GERS, C. 2000. A framework for the worldwide comparison of tropical woody vegetation types. Biological Conservation 95:175-189.
BONSOR, H. C. & MCDONALD, A. M. 2011. An initial estimate of depth to groundwater across Africa. British Geological Survey, Nottingham. 26 pp.
BOULVERT, Y. 1983. Carte pédologique de la république centrafricaine à 1 : 1 000 000. ORSTOM, Paris. 126 pp.
BOULVERT, Y. 1986. Carte phytogéographique de la République Centrafricaine (Feuille Ouest-Feuille Est) à 1 : 1 000 000. ORSTOM, Paris. 131 pp.
BOULVERT, Y. 1996. Etude géomorphologique de la république centrafricaine. Carte à 1 : 1 000 000 en deux feuilles Ouest et Est. Notice explicative no110. ORSTOM Editions, Paris. 258 pp.
BRUNO, R. D., DA ROCHA, H. R., DE FREITAS, H. C., GOULDEN, M. L. & MILLER,S.D.2006.Soil moisturedynamicsinaneasternAmazonian tropical forest. Hydrological Processes 20:2477-2489.
CANADELL, J., JACKSON, R. B., EHLERINGER, J. B., MOONEY, H. A., SALA, O. E. & SCHULZE, E. D. 1996. Maximum rooting depth of vegetation types at the global scale. Oecologia 108:583-595.
CERRI, C. C. & VOLKOFF, B. 1987. Carbon content in a yellow latosol of Central Amazon rain forest. Acta Oecologica-Oecologia Generalis 8:29-42.
CHRISTINA, M., LACLAU, J. P., GONCALVES, J. L. M., JOURDAN, C., NOUVELLON, Y. & BOUILLET, J. P. 2011. Almost symmetrical vertical growth rates above and below ground in one of the world's most productive forests. Ecosphere 2:1-10.
DRIESSEN, P., DECKERS, J., SPAARGAREN, O. & NACHTERGAELE, F. 2001.Lecture notes on the major soils of the world. Food and Agriculture Organization, Rome. 334 pp.
FAN, Y. & MIGUEZ-MACHO, G. 2010. Potential groundwater contribution to Amazon evapotranspiration. Hydrology and Earth System Sciences 14:2039-2056.
GERDAT. 1974. Sapelli. Bois et Forêts des Tropiques 154:27-40.
GOND, V., FAYOLLE, A., PENNEC, A., CORNU, G., MAYAUX, P., CAMBERLIN, P., DOUMENGE, C., FAUVET, N. & GOURLET-FLEURY, S. 2013. Vegetation structure and greenness in Central Africa from Modis multi-temporal data. Philosophical Transactions of the Royal Society B 368: 20120309.
HOLDO, R. M. & TIMBERLAKE, J. 2008. Rooting depth and aboveground community composition in Kalahari sand woodlands in western Zimbabwe. Journal of Tropical Ecology 24:169-176.
ICHII, K., HASHIMOTO, H., WHITE, M. A., POTTERS, C., HUTYRA, L. R., HUETE, A. R., MYNENI, R. B. & NEMANIS, R. R. 2007. Constraining rooting depths in tropical rainforestsusing satellite data and ecosystem modeling for accurate simulation of gross primary production seasonality. Global Change Biology 13:67-77.
KINGSBURY, N. & KELLMAN, M. 1997. Root mat depths and surface soil chemistry in southeastern Venezuela. Journal of Tropical Ecology 13:475-479.
KLEIDON, A. & HEIMANN, M. 2000. Assessing the role of deep rooted vegetation in the climate system with model simulations: mechanism, comparison to observations and implications forAmazoniandeforestation. ClimateDynamics16:183-199.
LACLAU, J. P., ARNAUD, M., BOUILLET, J. P. & RANGER, J. 2001. Spatial distribution of Eucalyptus roots in a deep sandy soil in the Congo: relationships with the ability of the stand to take up water and nutrients. Tree Physiology 21:129-136.
LACLAU, J. P., TOUTAIN, F., M'BOU, A. T., ARNAUD, M., JOFFRE, R. & RANGER, J. 2004. The function of the superficial root mat in the biogeochemical cycles of nutrients in Congolese Eucalyptus plantations. Annals of Botany 93:249-261.
LACLAU, J. P., SILVA, E. A., LAMBAIS, G., BERNOUX, M., LE MAIRE, G., STAPE, J. L., BOUILLET, J. P., GONÇALVES, J. L. M., JOURDAN, C. & NOUVELLON, Y. 2013. Dynamics of soil exploration by fine roots down to a depth of 10 m in Eucalyptus grandis plantations. Frontiers in Plant Science 4:1-12.
LEBRUN, J.-P. & STORK, A. L. 2011. Tropical African flowering plants. Ecology and distribution. Vol. 6. Burseraceae-Apiaceae. Addendum to volumes 1-5 (Families A-C). Conservatoire et Jardin Botanique de la ville de Genève, Genève. 398 pp.
LUCAS, Y., BOULET, R. & CHAUVEL, A. 1990. In situ genesis of stone lines -Demonstrative example from a lateritic cover in Brazilian Amazonia. Comptes Rendus Académie des Sciences, Série II 311:713-718.
LUCOT, E. 1994. Influence des caractéristiques de la pierrosité des sols sur la prospection racinaire et l'alimentation hydrique des arbres. Application à l'estimation de la valeur des sols forestiers.UniversitédeFranche-Comté, Besançon. 101 pp.
MAGIER, J.&RAVINA, I. 1984. Rock fragments and soil depth as factors in land evaluation of terra rossa. Pp. 99-103 in Nichols, J. D., Brown, P.L.&Grant,W. J. (eds.). Erosion and productivity of soils containing rock fragments. Special Publication 13. Soil Science Society of America, Madison.
MAKARIEVA, A. M. & GORSHKOV, V. G. 2007. Biotic pump of atmospheric moisture as driver of the hydrological cycle on land. Hydrology and Earth System Sciences 11:1013-1033.
NEPSTAD, D. C., DE CARVALHO, C. R., DAVIDSON, E. A., JIPP, P. H., LEFEBVRE, P. A., NEGREIROS, G. H., DA SILVA, E. D., STONE, T. A., TRUMBORE, S. E. & VIEIRA, S. 1994. The role of deep roots in the hydrological and carbon cycles of Amazonian forests and pastures. Nature 372:666-669.
NEPSTAD, D., LEFEBVRE, P., DA SILVA, U. L., TOMASELLA, J., SCHLESINGER, P., SOLORZANO, L., MOUTINHO, P., RAY, D. & BENITO, J. G. 2004. Amazon drought and its implications for forest flammability and tree growth: a basin-wide analysis. Global Change Biology 10:704-717.
OHNUKI, Y., SHIMIZU, A., CHANN, S., TORIYAMA, J., KIMHEAN, C. & ARAKI, M. 2008. Seasonal change in thick regolith hardness and water content in a dry evergreen forest in Kampong Thom Province, Cambodia. Geoderma 146:94-101.
REJOU-MECHAIN, M., PELISSIER, R., GOURLET-FLEURY, S., COUTERON, P., NASI, R. & THOMPSON, J. D. 2008. Regional variation in tropical forest tree species composition in the Central African Republic: an assessment based on inventories by forest companies. Journal of Tropical Ecology 24:663-674.
RIEDACKER,A.1978.Study of deviation of horizontal or oblique roots of poplar cutting encountering an obstacle -Applications on container design. Annales des Sciences Forestières 35:1-18.
RUIZ,L.,VARMA,M.R. R.,KUMAR,M.S.M.,SEKHAR,M.,MARÉCHAL, J.-C., DESCLOITRES, M., RIOTTE, J., KUMAR, S., KUMAR, C. & BRAUN, J.-J. 2010. Water balance modelling in a tropicalwatershed under deciduous forest (Mule Hole, India): Regolith matric storage buffers the groundwater recharge process. Journal of Hydrology 380:460-472.
SAYER, E. J., TANNER, E. V. J. & CHEESMAN, A. W. 2006. Increased litterfall changes fine root distribution in a moist tropical forest. Plant and Soil 281:5-13.
SCHENK, H. J. 2008. The shallowest possible water extraction profile: a null model for global root distributions. Vadose Zone Journal 7:1119-1124.
SCHENK, H. J. & JACKSON, R. B. 2002. The global biogeography of roots. EcologicalMonographs 72:311-328.
SCHENK, H. J. & JACKSON, R. B. 2005. Mapping the global distribution of deep roots in relation to climate and soil characteristics. Geoderma 126:129-140.
SEGALEN, P. 1969. Le remaniement des sols et la mise en place de la stone-line en Afrique. Cahiers ORSTOM, série Pédolologique 7:113-131.
SPRACKLEN,D.V.,ARNOLD,S. R.&TAYLOR,C.M.2012.Observations of increased tropical rainfall preceded by air passage over forests. Nature 489:282-286.
STERNBERG, L. D. L., GREEN, L., MOREIRA, M. Z., NEPSTAD, D., MARTINELLI, L. A. & VICTORIA, R. 1998. Root distribution in an Amazonian seasonal forest as derived from delta C-13 profiles. Plant and Soil 205:45-50.
TARDIEU, F. 1988. Analysis of the spatial variability of maize root density. 1. Effect of wheel compaction on the spatial arrangement of roots. Plant and Soil 107:259-266.
VITOUSEK, P. M. & SANFORD, R. L. 1986. Nutrient cycling in moist tropical forest. AnnualReview of Ecology and Systematics 17:137-167.
YONGO, O. 2003. Contribution aux études floristiques, phytogéographique et phytosociologiques de la forêt de Ngotto (République centrafricaine). Acta Botanica Gallica 150:119-124.
