DOI: 10.1016/j.foreco.2013.06.047
Scopus记录号: 2-s2.0-84887607987
论文题名: Tree species is the major factor explaining C: N ratios in European forest soils
作者: Cools N. ; Vesterdal L. ; De Vos B. ; Vanguelova E. ; Hansen K.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2014
卷: 311 起始页码: 3
结束页码: 16
语种: 英语
英文关键词: Carbon
; Forest floor
; ICP forests
; Mineral soil
; Nitrogen
; Tree species
Scopus关键词: Carbon
; Deposition
; Minerals
; Nitrogen
; Peat
; Soils
; Boosted regression trees
; Environmental variables
; Explanatory variables
; Forest floors
; ICP Forests
; Large-scale monitoring
; Mineral soils
; Tree species
; Forestry
; atmospheric deposition
; biogeochemistry
; coniferous forest
; deciduous forest
; ecoregion
; evergreen forest
; forest soil
; leaching
; nitrate
; soil carbon
; soil nitrogen
; Carbon
; Deposition
; Forests
; Minerals
; Nitrogen
; Peat
; Europe
; Alnus
; Alnus glutinosa
; Eucalyptus
; Ilex
; Pinus halepensis
; Pseudotsuga
; Pseudotsuga menziesii
; Quercus ilex
; Quercus suber
; Robinia pseudoacacia
英文摘要: 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 biogeographical 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. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/66225
Appears in Collections: 影响、适应和脆弱性
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作者单位: Research Institute for Nature and Forest (INBO), Gaverstraat 4, B-9500 Geraardsbergen, Belgium; Dept. of Geosciences and Natural Resource Management, University of Copenhagen, Rolighedsvej 23, DK-1958 Frederiksberg C, Denmark; Forest Research, Alice Holt Lodge, Farnham, Surrey GU10 4LH, United Kingdom; IVL Swedish Environmental Research Institute, Box 210 60, 100 31 Stockholm, Sweden
Recommended Citation:
Cools N.,Vesterdal L.,De Vos B.,et al. Tree species is the major factor explaining C: N ratios in European forest soils[J]. Forest Ecology and Management,2014-01-01,311