Biogeochemistry

, Volume 91, Issue 2–3, pp 163–175 | Cite as

Plant silicon isotopic signature might reflect soil weathering degree

Article

Abstract

Plants fractionate Si isotopes which provides a useful Si tracer in the Si soil-plant cycle. This study reports plant Si content and Si-isotopic signatures in mature banana plants grown on soils with different weathering degree, but all developed from basaltic pyroclasts in the Mungo area, Cameroon. The δ30Si compositions were determined in various plant parts and soil surface horizons by MC-ICP-MS in dry plasma mode with external Mg doping to a precision of ± 0.15‰ (± 2σSD). The Si-isotopic compositions in banana plants grown on weathered clayey soils (+0.54 ± 0.15‰) are heavier than on weakly developed soils rich in fresh ash and pumice (+0.02 ± 0.15‰). The corresponding bulk soils display lower δ30Si value in weathered soil (−1.41‰) than in poorly developed soil (−0.41‰). We suggest that the dissolved Si source for the plant, governed firstly by dissolution of easily weatherable minerals, was isotopically enriched in heavy isotopes through clay formation over long periods. At seasonal to annual time scale, this source is influenced by a combination of following processes: Si adsorption of light isotopes onto Fe oxides, plant Si uptake and recycling in surface horizons. This would provide an isotopically heavier Si source in the more weathered soil since the Fe oxides content increases with weathering. Plant Si-isotopic signature might thus reflect the soil weathering degree. This study further suggests that in addition to weathering processes, rivers isotopic signatures likely depend on the fate of phytoliths in the soil-plant-river system.

Keywords

Isotopic fractionation Musa Si cycle Cameroon Soil Weathering sequence 

Notes

Acknowledgments

We woulk like to thank K. Tomekpe and the staff of the “Centre Africain de Recherche sur Bananiers et Plantains” (CARBAP) from Cameroon for their essential support during fieldwork. We greatly thank N. Mattielli and J. de Jong (ULB) for managing the MC-ICP-MS facility in ULB, and A. Iserentant, C. Givron, A. Lannoye, P. Populaire (UCL), L. Monin, N. Dahkani (MRAC) for laboratory assistance. This manuscript has greatly benefited from the constructive comments of A. Sonck and of three anonymous reviewers. S.O. acknowledges the “Communauté française de Belgique” for the travel bursary RS/CHK/RM/CaM/BV05-07. S.O. is supported by the “Fonds National de la Recherche Scientifique” (FNRS) of Belgium as a Research Fellow and D.C. by the Federal Belgian Science Policy. The Si isotopes methodology has been set up owing to various supports from BELSPO (EV/37/7C), FNRS (FRFC 2.4.512.00F), the EC (EVK-CT-2000-00057). This research was supported by the FNRS research convention No. 2.4629.05 and by the “Fonds Spécial de Recherche” (FSR) 2005 of the UCL. The authors thank all these funding agencies for their financial support.

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • S. Opfergelt
    • 1
    • 2
  • B. Delvaux
    • 1
  • L. André
    • 2
  • D. Cardinal
    • 2
  1. 1.Soil Science UnitUniversité catholique de LouvainLouvain-la-NeuveBelgium
  2. 2.Department of Geology and MineralogyMusée Royal de l’Afrique CentraleTervurenBelgium

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