CheneBelgiqueV2, Main, Merge, bibRecord, 000129

Tree species is the major factor explaining C:N ratios in European forest soils

Identifieur interne : 000129 ( Main/Merge ); précédent : 000128; suivant : 000130

Tree species is the major factor explaining C:N ratios in European forest soils

Auteurs : N. Cools [Belgique] ; L. Vesterdal [Danemark] ; B. De Vos [Belgique] ; E. Vanguelova [Royaume-Uni] ; K. Hansen [Suède]

Source :

Forest ecology and management [ 0378-1127 ] ; 2014.

RBID : Pascal:14-0031336

Descripteurs français

Pascal (Inist)
- Rapport carbone azote, Forêt, Litière, Foresterie, Arbre, Carbone, Azote, Europe, Sol forestier, Sol minéral, Ecologie forestière.
Wicri :
- topic : Forêt, Arbre, Carbone, Azote.

English descriptors

KwdEn :
- Carbon, Carbon nitrogen ratio, Europe, Forest ecology, Forest soil, Forestry, Forests, Litter, Mineral soils, Nitrogen, Tree.

Abstract

The C:N ratio is considered as an indicator of nitrate leaching in response to high atmospheric nitrogen (N) deposition. However, the C:N ratio is influenced by a multitude of other site-related factors. This study aimed to unravel the factors determining C:N ratios of forest floor, mineral soil and peat top soils in more than 4000 plots of the ICP Forests large-scale monitoring network. The first objective was to quantify forest floor, mineral and peat soil C:N ratios across European forests. Secondly we determined the main factors explaining this C:N ratio using a boosted regression tree analysis (BRT), including fifteen site and environmental variables. Ninety-five percent of the C:N ratios were between 16 and 44 in the forest floor, between 13 and 44 in the peat topsoil and between 10 and 32 in the mineral topsoil. Within the aerated forest floor and the mineral soil, the C:N ratios decreased with depth, while in the hydromorphic forest floor and the peats no clear trend with depth was observed. Tree species was clearly the most important explanatory variable for the C:N ratio in both forest floors and topsoils, while it was soil type in the deeper mineral soil layers. The lowest C:N ratios both in the forest floor and the top mineral soil were found in black locust (Robinia pseudoacacia L.) and black alder (Alnus glutinosa L.) stands, both N fixing tree species. While in the forest floor the highest C:N ratios were found in evergreen species like pine. cork oak (Quercus suber L.) and eucalyptus, the pine species and Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) showed the highest C:N ratios in the mineral soil. The second most important explanatory variable in the forest floor and mineral topsoil was the biogeo-graphical zoning (ecoregion). In the peat topsoil and in the deeper mineral soil layers it was the humus type. Deposition and climatic variables were of minor importance at the European scale. Further analysis for eight main forest tree species individually, showed that the influence of environmental variables on C:N ratios was tree species dependent. For Aleppo pine (Pinus halepensis Miller) and holm oak (Quercus ilex L.), both with a typical Mediterranean distribution, the relationship between N and S deposition and C:N ratio appeared to be positive. This study suggests that applying C:N ratios as a general indicator of the N status in forests at the European level, without explicitly accounting for tree species, is too simplistic and may result in misleading conclusions.

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Pascal:14-0031336

Le document en format XML

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<author><name sortKey="Vesterdal, L" sort="Vesterdal, L" uniqKey="Vesterdal L" first="L." last="Vesterdal">L. Vesterdal</name>
<affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Dept. of Geosciences and Natural Resource Management. University of Copenhagen, Rolighedsvej 23</s1>
<s2>1958 Frederiksberg C</s2>
<s3>DNK</s3>
<sZ>2 aut.</sZ>
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<country>Danemark</country>
<wicri:noRegion>1958 Frederiksberg C</wicri:noRegion>
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<author><name sortKey="De Vos, B" sort="De Vos, B" uniqKey="De Vos B" first="B." last="De Vos">B. De Vos</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Research Institute for Nature and Forest (INBO), Gaverstraat 4</s1>
<s2>9500 Geraardsbergen</s2>
<s3>BEL</s3>
<sZ>1 aut.</sZ>
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<term>Azote</term>
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<term>Sol forestier</term>
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<front><div type="abstract" xml:lang="en">The C:N ratio is considered as an indicator of nitrate leaching in response to high atmospheric nitrogen (N) deposition. However, the C:N ratio is influenced by a multitude of other site-related factors. This study aimed to unravel the factors determining C:N ratios of forest floor, mineral soil and peat top soils in more than 4000 plots of the ICP Forests large-scale monitoring network. The first objective was to quantify forest floor, mineral and peat soil C:N ratios across European forests. Secondly we determined the main factors explaining this C:N ratio using a boosted regression tree analysis (BRT), including fifteen site and environmental variables. Ninety-five percent of the C:N ratios were between 16 and 44 in the forest floor, between 13 and 44 in the peat topsoil and between 10 and 32 in the mineral topsoil. Within the aerated forest floor and the mineral soil, the C:N ratios decreased with depth, while in the hydromorphic forest floor and the peats no clear trend with depth was observed. Tree species was clearly the most important explanatory variable for the C:N ratio in both forest floors and topsoils, while it was soil type in the deeper mineral soil layers. The lowest C:N ratios both in the forest floor and the top mineral soil were found in black locust (Robinia pseudoacacia L.) and black alder (Alnus glutinosa L.) stands, both N fixing tree species. While in the forest floor the highest C:N ratios were found in evergreen species like pine. cork oak (Quercus suber L.) and eucalyptus, the pine species and Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) showed the highest C:N ratios in the mineral soil. The second most important explanatory variable in the forest floor and mineral topsoil was the biogeo-graphical zoning (ecoregion). In the peat topsoil and in the deeper mineral soil layers it was the humus type. Deposition and climatic variables were of minor importance at the European scale. Further analysis for eight main forest tree species individually, showed that the influence of environmental variables on C:N ratios was tree species dependent. For Aleppo pine (Pinus halepensis Miller) and holm oak (Quercus ilex L.), both with a typical Mediterranean distribution, the relationship between N and S deposition and C:N ratio appeared to be positive. This study suggests that applying C:N ratios as a general indicator of the N status in forests at the European level, without explicitly accounting for tree species, is too simplistic and may result in misleading conclusions.</div>
</front>
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Tree species is the major factor explaining C:N ratios in European forest soils

Tree species is the major factor explaining C:N ratios in European forest soils

Source :

Descripteurs français

English descriptors

Abstract

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Pour manipuler ce document sous Unix (Dilib)

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