Minor contribution of leaf litter to N nutrition of beech (Fagus sylvatica) seedlings in a mountainous beech forest of Southern Germany

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2013
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Guo, Chanjuan
Gasche, Rainer
Naumann, Pascale Sarah
Bimüller, Carolin
Pena, Rodica
Polle, Andrea
Kögel-Knabner, Ingrid
Zeller, Bernd
Rennenberg, Heinz
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Plant and Soil. 2013, 369(1-2), pp. 657-668. ISSN 0032-079X. eISSN 1573-5036. Available under: doi: 10.1007/s11104-013-1603-6
Zusammenfassung

Aims:
Our aims were to characterize the fate of leaf-litter-derived nitrogen in the plant-soil-microbe system of a temperate beech forest of Southern Germany and to identify its importance for N nutrition of beech seedlings.

Methods:
15N-labelled leaf litter was traced in situ into abiotic and biotic N pools in mineral soil as well as into beech seedlings and mycorrhizal root tips over three growing seasons.

Results:
There was a rapid transfer of 15N into the mineral soil already 21 days after tracer application with soil microbial biomass initially representing the dominant litter-N sink. However, 15N recovery in non-extractable soil N pools strongly increased over time and subsequently became the dominant 15N sink. Recovery in plant biomass accounted for only 0.025 % of 15N excess after 876 days. After three growing seasons, 15N excess recovery was characterized by the following sequence: non-extractable soil N >> extractable soil N including microbial biomass >> plant biomass > ectomycorrhizal root tips.

Conclusions:
After quick vertical dislocation and cycling through microbial N pools, there was a rapid stabilization of leaf-litter-derived N in non-extractable N pools of the mineral soil. Very low 15N recovery in beech seedlings suggests a high importance of other N sources such as root litter for N nutrition of beech understorey.

Zusammenfassung in einer weiteren Sprache
Fachgebiet (DDC)
570 Biowissenschaften, Biologie
Schlagwörter
Nitrogen cycling, Beech, 15N-labelled leaf litter, 15N tracing, Microbial biomass, Ectomycorrhiza
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ISO 690GUO, Chanjuan, Judy SIMON, Rainer GASCHE, Pascale Sarah NAUMANN, Carolin BIMÜLLER, Rodica PENA, Andrea POLLE, Ingrid KÖGEL-KNABNER, Bernd ZELLER, Heinz RENNENBERG, Michael DANNENMANN, 2013. Minor contribution of leaf litter to N nutrition of beech (Fagus sylvatica) seedlings in a mountainous beech forest of Southern Germany. In: Plant and Soil. 2013, 369(1-2), pp. 657-668. ISSN 0032-079X. eISSN 1573-5036. Available under: doi: 10.1007/s11104-013-1603-6
BibTex
@article{Guo2013-08Minor-43353,
  year={2013},
  doi={10.1007/s11104-013-1603-6},
  title={Minor contribution of leaf litter to N nutrition of beech (Fagus sylvatica) seedlings in a mountainous beech forest of Southern Germany},
  number={1-2},
  volume={369},
  issn={0032-079X},
  journal={Plant and Soil},
  pages={657--668},
  author={Guo, Chanjuan and Simon, Judy and Gasche, Rainer and Naumann, Pascale Sarah and Bimüller, Carolin and Pena, Rodica and Polle, Andrea and Kögel-Knabner, Ingrid and Zeller, Bernd and Rennenberg, Heinz and Dannenmann, Michael}
}
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    <dcterms:abstract xml:lang="eng">Aims:&lt;br /&gt;Our aims were to characterize the fate of leaf-litter-derived nitrogen in the plant-soil-microbe system of a temperate beech forest of Southern Germany and to identify its importance for N nutrition of beech seedlings.&lt;br /&gt;&lt;br /&gt;Methods:&lt;br /&gt;&lt;sup&gt;15&lt;/sup&gt;N-labelled leaf litter was traced in situ into abiotic and biotic N pools in mineral soil as well as into beech seedlings and mycorrhizal root tips over three growing seasons.&lt;br /&gt;&lt;br /&gt;Results:&lt;br /&gt;There was a rapid transfer of &lt;sup&gt;15&lt;/sup&gt;N into the mineral soil already 21 days after tracer application with soil microbial biomass initially representing the dominant litter-N sink. However, &lt;sup&gt;15&lt;/sup&gt;N recovery in non-extractable soil N pools strongly increased over time and subsequently became the dominant &lt;sup&gt;15&lt;/sup&gt;N sink. Recovery in plant biomass accounted for only 0.025 % of &lt;sup&gt;15&lt;/sup&gt;N excess after 876 days. After three growing seasons, &lt;sup&gt;15&lt;/sup&gt;N excess recovery was characterized by the following sequence: non-extractable soil N &gt;&gt; extractable soil N including microbial biomass &gt;&gt; plant biomass &gt; ectomycorrhizal root tips.&lt;br /&gt;&lt;br /&gt;Conclusions:&lt;br /&gt;After quick vertical dislocation and cycling through microbial N pools, there was a rapid stabilization of leaf-litter-derived N in non-extractable N pools of the mineral soil. Very low &lt;sup&gt;15&lt;/sup&gt;N recovery in beech seedlings suggests a high importance of other N sources such as root litter for N nutrition of beech understorey.</dcterms:abstract>
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