Plant and Soil

, Volume 266, Issue 1–2, pp 247–259 | Cite as

Impact of Douglas-fir and Scots pine seedlings on plagioclase weathering under acidic conditions

  • M. R. Bakker
  • E. George
  • M. -P. Turpault
  • J. L. Zhang
  • B. Zeller


The weathering of soil minerals in forest ecosystems increases nutrient availability for the trees. The rate of such weathering and its relative contribution to forest tree nutrition, is a major issue when evaluating present and potential forest stand productivity and sustainability. The current paper examines the weathering rate of plagioclase with and without Douglas-fir or Scots pine seedlings, in a laboratory experiment at pH 3–4 and 25 °C. All nutrients, with the exception of Ca, were supplied in sufficient amounts in a nutrient solution. The objective of the experiment was to evaluate the potential of trees to mobilise Ca from the mineral plagioclase that contained 12% of Ca. Amounts of nutrients supplied in the nutrient solution, amounts accumulated in the living tissue of the seedlings and amounts leached from the experimental vessels, were measured. A weathering balance, accounting for leached + accumulated − supplied amounts, was established. Bio-induced weathering, defined as the weathering increase in the presence of trees, relative to the weathering rate without trees (geochemical weathering; control vessels), under the present experimental conditions, explained on average, 40% of total weathering (biological + geochemical). These conditions appeared more beneficial to Scots pine (higher relative growth rate, higher Ca incorporation) than to Douglas-fir.

Key words

Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) plagioclase Scots pine (Pinus sylvestris L.) tree nutrition weathering 


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Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • M. R. Bakker
    • 1
    • 3
  • E. George
    • 2
    • 5
  • M. -P. Turpault
    • 3
  • J. L. Zhang
    • 4
    • 5
  • B. Zeller
    • 3
  1. 1.INRA-Bordeaux, UMR TCEM, INRA-ENITABVillenave d’Ornon cedexFrance
  2. 2.Institute for Crop Sciences (IGZ)Humboldt University BerlinGrossbeerenGermany
  3. 3.INRA-NancyEquipe Biogéochimie des Ecosystèmes ForestièresChampenouxFrance
  4. 4.Department of Plant NutritionCollege of Agricultural Resources and Environmental Sciences, China Agricultural University (West Campus)BeijingP.R. China
  5. 5.Institute for Plant NutritionUniversity of HohenheimStuttgartGermany

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