DOI: 10.1007/s10533-017-0364-3
Scopus记录号: 2-s2.0-85026524012
论文题名: Nitrate leaching from a sub-alpine coniferous forest subjected to experimentally increased N deposition for 20 years, and effects of tree girdling and felling
作者: Schleppi P. ; Curtaz F. ; Krause K.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 134, 期: 3 起始页码: 319
结束页码: 335
语种: 英语
英文关键词: 15N isotope
; Forest ecosystem
; Nitrate leaching
; Nitrogen deposition
; Paired-catchment experiment
; Tree girdling
Scopus关键词: coniferous forest
; dissolved inorganic nitrogen
; dissolved organic nitrogen
; experimental design
; forest ecosystem
; leaching
; nitrate
; nitrification
; nitrogen isotope
; soil chemistry
; subalpine environment
; tracer
; tree
; Alptal
; Schwyz [Switzerland]
; Switzerland
; Picea
; Picea abies
英文摘要: Increased nitrogen (N) deposition rates were simulated for 20 years (1995–2015) by sprinkling rain water enriched with NH4NO3 (+22 kg ha−1 year−1 N) in a small headwater catchment within a spruce (Picea abies) forest at Alptal (central Switzerland). The added N was labelled with 15NH4 15NO3 during the first year. A control catchment was labelled in years 6 and 8. NO3 − leaching doubled in the N-addition catchment during the first year, resulting almost entirely from loss of 15N-labelled NO3 −. The proportion of added N leached as NO3 −–N reached 1/3 after 5 years, then remained stable for the next 10 years, at 6.6–10 kg ha−1 year−1 compared with 1.4–2.9 kg ha−1 year−1 in the control catchment. In each catchment, half of the large trees were girdled during the 15th year and felled 1 year later to assess their role in soil N retention. Girdling and felling resulted in a strong increase in NO3 −–N leaching from the N-addition catchment (up to 19 kg ha−1 year−1). The increase was significantly smaller in the control (up to 4 kg ha−1 year−1). NO3 − leached after tree girdling contained only 0.18% of the originally applied tracer in the control and none detectable in the N-addition catchment. The increased leaching was thus mainly from new N and due to reduced N immobilisation by trees rather than to increased N mineralisation and nitrification in the soil. Dissolved organic N leaching (average 6.1 kg ha−1 year−1), in contrast, was unaffected by the treatment. © 2017, Springer International Publishing AG. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83252
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Swiss Federal Institute for Forest, Snow and Landscape Research, Birmensdorf, Switzerland; DISAFA, NatRisk-LNSA, University of Turin, Turin, Italy; Kaden & Partner AG, Frauenfeld, Switzerland
Recommended Citation:
Schleppi P.,Curtaz F.,Krause K.. Nitrate leaching from a sub-alpine coniferous forest subjected to experimentally increased N deposition for 20 years, and effects of tree girdling and felling[J]. Biogeochemistry,2017-01-01,134(3)