Foliar P nutrition of European beech ( Fagus sylvatica L.) depends on the season but remains unaffected by co-cultivatio
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ORIGINAL PAPER
Foliar P nutrition of European beech (Fagus sylvatica L.) depends on the season but remains unaffected by co‑cultivation with silver fir (Abies alba Mill.) Fengli Yang1,5 · Ruth‑Kristina Magh1 · Mladen Ivanković3 · Miran Lanšćak3 · Simon Haberstroh2 · Baoguo Du1 · Michael Dannenmann4 · Heinz Rennenberg1 · Cornelia Herschbach1,2 Received: 27 September 2019 / Revised: 27 April 2020 / Accepted: 7 May 2020 © The Author(s) 2020
Abstract Beech (Fagus sylvatica) and silver fir (Abies alba) are often cultivated in mixed stands and, hence, compete for water and nutrients. Besides nitrogen (N), also phosphorus (P) is an important nutrient for growth and development. Beech trees in Central Europe grow on both P-poor and P-rich soils, thereby showing similar growth and low variation in foliar P. The central aim of the present study was to test the hypothesis that variations in foliar P contents of beech are driven by seasonal changes rather than by the competition with silver fir. It was further hypothesized that P contents in silver fir needles depend on needle age and forest site. To test these hypotheses, P contents and P fractions, i.e. organic-bound P ( Porg) and inorganic phosphate P (Pi), were measured in the foliage of beech trees from pure beech and mixed beech/silver fir plots as well as in needles of silver fir of the mixed plots. The forest sites investigated are located in Central Europe in the Black Forest, Germany, and in Croatia near the south-eastern distribution limit of beech and are all poor in plant-available soil P. The analyses showed that the main driver of P contents and P fractions in beech leaves at all forest sites is the season and that competition with silver fir had no effect. Hence, the present results demonstrate the high plasticity of beech trees to adapt to both poor plantavailable soil P and competition with silver fir. Total P contents of silver fir needles were higher at the Croatian site compared to the Black Forest sites and originated from higher foliar Pi contents. One third of the P present in current-year needles in late summer was remobilized and exported until the needles reached the age of 1 year. The difference in P contents between current-year and 1-year-old needles can be seen as the amount of P resorbed from 1-year-old needles in summer during the generation of new needles to support the P demand of current-year needles for growth and development. Keywords Fagus sylvatica · Abies alba · Competition · Phosphorus nutrition · Seasonal changes
Introduction Communicated by Agustín Merino. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10342-020-01289-1) contains supplementary material, which is available to authorized users. * Cornelia Herschbach [email protected]‑freiburg.de 1
Chair of Tree Physiology, Institute of Forest Sciences, Albert-Ludwigs-University Freiburg, Georges‑Köhler‑Allee 53/54, 79110 Freiburg, Germany
2
Chair of Ecosystem Physiology, Institute of Forest Sci
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