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Effects of four different restoration treatments on the natural abundance of 15N stable isotopes in plants

  • 15 δ N signals in plant and soil material integrate over a number of biogeochemical processes related to nitrogen (N) and therefore provide information on net effects of multiple processes on N dynamics. In general little is known in many grassland restoration projects on soil–plant N dynamics in relation to the restoration treatments. In particular, 15 δ N signals may be a useful tool to assess whether abiotic restoration treatments have produced the desired result. In this study we used the range of abiotic and biotic conditions provided by a restoration experiment to assess to whether the restoration treatments and/or plant functional identity and legume neighborhood affected plant 15 δ N signals. The restoration treatments consisted of hay transfer and topsoil removal, thus representing increasing restoration effort, from no restoration measures, through biotic manipulation to major abiotic manipulation. We measured 15 δ N and %N in six different plant species (two nonlegumes and four legumes) across the restoration treatments. We found that restoration treatments were clearly reflected in 15 δ N of the non-legume species, with very depleted 15 δ N associated with low soil N, and our results suggest this may be linked to uptake of ammonium (rather than nitrate). The two non-legume species differed considerably in their 15 δ N signals, which may be related to the two species forming different kinds of mycorrhizal symbioses. Plant 15 δ N signals could clearly separate legumes from non-legumes, but our results did not allow for an assessment of legume neighborhood effects on non-legume 15 δ N signals. We discuss our results in the light of what the 15 δ N signals may be telling us about plant–soil N dynamics and their potential value as an indicator for N dynamics in restoration.

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Metadaten
Author:Vicky M. Temperton, Lea L. A. Märtin, Daniela Röder, Andreas Lücke, Kathrin KiehlORCiD
Title (English):Effects of four different restoration treatments on the natural abundance of 15N stable isotopes in plants
DOI:https://doi.org/10.3389/fpls.2012.00070
Parent Title (English):Frontiers in Plant Science
Document Type:Article
Language:English
Date of Publication (online):2012/04/26
Release Date:2023/10/16
Tag:functional type; legumes; restoration; stable isotopes; topsoil removal
Issue:3
Page Number:12
Faculties:Fakultät AuL
DDC classes:500 Naturwissenschaften und Mathematik / 580 Pflanzen (Botanik)
Review Status:Veröffentlichte Fassung/Verlagsversion
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International