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Rineau, François; Garbaye, Jean
Mycorrhiza, 09/2009, Letnik: 19, Številka: 7Journal Article
Liming (Ca-Mg soil amendment) is a forestry practice used to correct soil acidification and restore health and productivity in declining stands. Liming is known to modify tree mineral nutrition beyond the sole Ca and Mg. We hypothesized that liming also modifies the very functioning of the tree absorbing system (that is the ectomycorrhizal fine roots) in a way that facilitates the mobilization of mineral nutrients, particularly those entrapped in soil organic matter. This hypothesis has been tested here in beech and Norway spruce stands in North-Eastern France. In autumn, we compared the ectomycorrhizal community structure and the enzymatic profiles of ectomycorrhizal root tips in limed and untreated plots by measuring the activities of eight enzymes related to the degradation of soil organic matter. The results show that the ectomycorrhizal community responds to the Ca-Mg amendment and to the resulting soil modifications by modified enzyme activity profiles and ability to mobilize nutrients from soil organic matter. The effects of liming on the belowground functioning of the tree stands result essentially from specialized ECM fungal species such as Clavulina cristata (with strong glucuronidase activity), Lactarius subdulcis (with strong laccase activity) or Xerocomus pruinatus (with strong leucine aminopeptidase activity).
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