The effect of lime and gypsum applications on a sessile oak ( Quercus petraea (M.) Liebl.) stand at La Croix-Scaille (French Ardennes) II. Fine root dynamics |
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Authors: | MR Bakker |
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Institution: | (1) INRA – Centre de Nancy Equipe Cycles Biogéochimiques, F-54280 Champenoux, France |
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Abstract: | Fine root distribution, quantities, dynamics and composition were studied in a sessile oak coppice stand in the French Ardennes
on an acidic soil (< pH-H2O 4.5), one to five years after lime or gypsum applications. Fine root biomass and length increased
and specific root length decreased after lime or gypsum treatments. The treatment responses were strongest four to five years
after the applications, but the tendencies after one year were similar. The effects were pronounced in the top 15 cm but also
at 30–45 cm four to five years after liming. The latter effect suggests an indirect positive feedback from the aerial parts
of the trees into the deeper soil layers. Sequential sampling for two years revealed large differences in total fine root
length between the years, and also indicated that fine root turnover was lower after liming or gypsum applications than in
the control. This seemed to be related to a lower fine root mortality and higher longevity rather than to increased fine root
production. The improved nutrient status of the fine roots corroborates this and coincides with improved foliar nutrition
and tree growth. Moderate doses of lime and gypsum appeared effective in enhancing root system uptake function, resulting
in increased above ground growth. |
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Keywords: | fine root biomass fine root dynamics fine root length gypsum lime Quercus petraea |
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