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The lateral spread of tree root systems in boreal forests: Estimates based on super(1) super(5)N uptake and distribution of sporocarps of ectomycorrhizal fungi
Ist Teil von
Forest ecology and management, 2008-02, Vol.255 (1), p.75-81
Erscheinungsjahr
2008
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
In nutrient poor environments, such as boreal forests, many of the most important interactions between plants take place belowground. Here, we report the results of two approaches to obtain estimates of the lateral spread of tree roots. In a Pinus sylvestris forest and a Picea abies dominated forest, lateral root spread was estimated by analysing the distribution of ectomycorrhizal sporocarps on tree-girdled and adjacent non-girdled plots and by a super(1) super(5)N uptake experiment, where the soil in circular 1m super(2) plots was labelled and the uptake by surrounding trees was studied. Both methods gave similar estimates of lateral root spread, i.e. between 4 and 5m, and both studies indicated overlapping of root systems. Up to 11 trees took up tracer from a 1m super(2) labelled area, although not all trees close to the super(1) super(5)N-labelled area took up tracer. The study clearly showed the dependence of ectomycorrhizal fungi on photosynthate and indicated a high potential for belowground competition between trees due to substantially overlapping root systems.