Vertical distribution of an ectomycorrhizal community in top soil horizons of a young Norway spruce (Picea abies [L.] Karst.) stand of the Bavarian Limestone Alps

München

2006

Publikation III, S. 195-217

5 Abb., 1 Tab., zahlr. Lit. Ang.

Artikel aus einer ZeitschriftUnselbständiges Werk

200146075

The vertical niche differentiation of genera of ectomycorrhiza (ECM) was assessed in a 17 years old Norway spruce (Picea abies L. [Karst.]) plantation on a mountainous dolomitic site (1050 m.a.s.l.) of the Bavarian Limestone Alps. We determined ECM anatomotypes, recorded the abundance of corresponding ECM root tips, and classified them into groups of ECM exploration types, which refer to the organisation and the extent of their extramatrical mycelia. The abundance of ECM was highest in the organic soil layers compared to the mineral soil horizon. The ordination of the ECM communities and of the exploration types revealed segregation in dependency on differences in soil horizon properties. While Cenococcum geophilum preferred the organic soil layers, Lactarius spp., Tomentella spp., and Craterellus tubaeformis were generally most abundant in the mineral soil horizons. C. geophilum was the predominant species possibly based on enhanced competitiveness under the prevailing site conditions. The short-distance exploration types (e.g. C. geophilum) preferentially colonized the organic soil layer, whereas the contact types (e.g. most of the Tomentella spp., Craterellus tubaeformis) together with medium-distance types (e.g. Amphinema byssoides) were primarily associated with the underlying A-horizons. Therefore, the soil horizons had an important effect on the distribution of ECM and on their community structure. The spatial niche differentiation of ECM genera and exploration types is discussed in regard to soil horizon specific physicochemical properties and the assumed ecophysiological strategies of the ECM.