Nitrogen cycling and storage in Gagea spathacea (Liliaceae) – ecological insights for protecting a rare woodland species

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung

Beitragende

  • Andreas Fichtner - , Leuphana Universität Lüneburg (Autor:in)
  • Diethart Matthies - , Philipps-Universität Marburg (Autor:in)
  • Malin Armbrust - , Leuphana Universität Lüneburg (Autor:in)
  • Doris Jansen - , Jansen & Rickert, Neumünster (Autor:in)
  • Knut Sturm - , Naturwald Akademie gGmbH Lübeck (Autor:in)
  • David Walmsley - , Leuphana Universität Lüneburg (Autor:in)
  • Goddert von Oheimb - , Institut für Allgemeine Ökologie und Umweltschutz, Deutsches Zentrum für integrative Biodiversitätsforschung (iDiv) Halle-Jena-Leipzig (Autor:in)
  • Werner Härdtle - , Leuphana Universität Lüneburg (Autor:in)

Abstract

Strategies to globally protect biological diversity are often hampered by an insufficient ecological knowledge about target species. This also applies to Gagea spathacea (Liliaceae), a ‘vulnerable’ woodland spring geophyte with a distribution largely restricted to the lowlands of Central Europe. We studied whether the species’ linkage to highly fertile forest soils is related to its high nitrogen (N) demands during its short developmental cycle. We hypothesized that the species exhibits a highly efficient N (re)cycling strategy, characterized by efficient resorption of N from the leaves and reallocation to bulbs at the end of the growing season. To test this assumption, we conducted a 15N tracer experiment and quantified 15N flows between soil, leaves, bulbs, and roots. Our findings support our hypothesis that G. spathacea is exceptionally efficient in recycling N, shown by the resorption of 68% of leaf N and its reallocation to bulbs at the end of the growing season. After 6 weeks of growth the plant showed a distinct shift in its N metabolism: The C:N ratio of leaves strongly increased and those of bulbs decreased, leaf 15N enrichment and recovery started to decrease, while total plant 15N recovery remained constant, indicating no further N uptake from the soil. Leaf N reallocation to bulbs was accompanied by a twofold increase of the bulbs’ biomass. Because of the stenoecious behaviour of G. spathacea, a careful protection and sustainable management of G. spathacea forest habitats is necessary, particularly in its Central European core area.

Details

OriginalspracheEnglisch
Seiten (von - bis)1117 - 1126
Seitenumfang10
FachzeitschriftPlant Ecology
Jahrgang219
PublikationsstatusVeröffentlicht - 2018
Peer-Review-StatusJa

Externe IDs

Scopus 85050905452
ORCID /0000-0001-7408-425X/work/147141706

Schlagworte