Nitrogen cycling and storage in <Emphasis Type="Italic">Gagea spathacea</Emphasis> (Liliaceae): ecological insights for protecting a rare woodland species |
| |
Authors: | Andreas?Fichtner Diethart?Matthies Malin?Armbrust Doris?Jansen Knut?Sturm David?Walmsley Goddert?von?Oheimb Email authorView authors OrcID profile" target="_blank">Werner?H?rdtleEmail authorView authors OrcID profile |
| |
Institution: | 1.Institute of Ecology, Faculty of Sustainability,Leuphana University of Lüneburg,Lüneburg,Germany;2.Department of Ecology, Faculty of Biology,Philipps-University Marburg,Marburg,Germany;3.Jansen & Rickert,Neumünster,Germany;4.Community Forest Lübeck,Lübeck,Germany;5.Institute of General Ecology and Environmental Protection,Technische Universit?t Dresden,Tharandt,Germany;6.German Centre of Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig,Leipzig,Germany |
| |
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. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|