Comparing indicators of N status of 50 beech stands (Fagus sylvatica L.) in northeastern France

Abstract : We compared different potential indicators of nitrogen (N) availability across 50 beech forests growing on a wide range of soils in northeastern France. Among the 50 sitesmeasured, high elevation acidic soils had the highest potential net N mineralization in the A horizon (PNM0–5 cm), while low elevation neutral and calcareous soils had the lowest (PNM0–5 cm). We found that (PNM0–5 cm) was negatively correlated with soil pH (R2 = 0.47***) and positively correlated with microbial C/N (R2 = 0.34***). However, when high elevation sites were excluded from analyses, the relationship between PNM0–5 cm and soil pH as well asmicrobial C/N became weaker (R2 = 0.23*** for both variables).Wefound no relationship between PNM0–5 cm and organic N concentration, soil C/N, or vegetation-based indices for N availability (Ellenberg N and Ecoplant C/N). Bivariate linear regression analyses showed that 69% of the variability in percent nitrification (%Nitrif) was explained by both soil pH (0–5 cm) and soil C/N. Percent nitrification was strongly correlated with vegetation-based indices for N availability. The Ellenberg N and R (pH index) values together explained 74% of the variation in %Nitrif. No relationship was found between %Nitrif and soil d15N (natural abundance in 15N). Of the 76 plant species evaluated, the probability of
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Kasaina-Sitraka Andrianarisoa, Bernhard Zeller, Jean-Luc Dupouey, Etienne Dambrine. Comparing indicators of N status of 50 beech stands (Fagus sylvatica L.) in northeastern France. 4926, 2009, 257 (11), pp.2241-2253. ⟨hal-00489796⟩



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