Influence of waterlogging on root distribution, fine-root biomass and mycorrhizal number of Norway spruce
1991
Rastin, N.
Root distribution, fine root biomass and mycorrhizal number were investigated in three spruce stands growing on soils (silty loam) which developed from the same parent material but differed in bulk density and soil moisture contents. According to a regional soil survey, one of the sites is a similigley (Pseudogley, site IX), the second site is a Braunerde-similigley (site VIII) and the third site is a Braunerde (site III). Fine root biomass and mycorrhizal number showed a large spatial variation on each site. Because of this, a comparison of the results between the three sites is not meaningful. A large spatial variation was also detected for fine and small roots counted on 10 dm(2) of the trench face. Results of these counts were partly inconsistent with the results known from the literature. The S(d)-horizon of site VIII and IX showed relatively high fine roof numbers. The deepest point in the soil at which fine and small roots were found, was 140 cm (S(d)-horizon) on site IX, and thus in the stagnation layer, which is supposed to be under the direct influence of waterlogging for a long period of time during the year. Large and very large live roots on site VIII were surprisingly better distributed and penetrated deeper than on site III. Soil acidification, which was stronger and more advanced in depth at site III, is discussed as a possible cause.
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