Auteurs
Hilde BM Tomassen, Alfons JP Smolders, Leon PM Lamers, Jan GM Roelofs
Publicatiedatum
2003/6
Tijdschrift
Journal of Ecology
Volume
91
Editie
3
Pagina's
357-370
Uitgever
Blackwell Science Ltd
Beschrijving
1 In order to test whether the observed invasion of ombrotrophic bogs in the Netherlands by Molinia caerulea and Betula pubescens is the result of long‐term high nitrogen (N) loads, we conducted a 3‐year fertilization experiment with Sphagnum fallax turfs. Six different N treatments were applied ranging from 0 (control) to 4 g N m−2 year−1.
2 During the experimental period, ammonium concentrations in the peat moisture remained very low due to high uptake rates by Sphagnum. Tissue N concentrations in S. fallax showed a linear response to the experimental N addition. Excess N was accumulated as N‐rich free amino acids such as arginine, asparagine and glutamine, especially at N addition rates of 0.25 g m−2 year−1 or higher, indicating N‐saturation.
3 Despite the high tissue N : P ratio (above 35), above‐ground biomass production by Molinia was still stimulated at N addition rates of 4 g m−2 year−1 …
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