DOI: 10.1007/s10533-015-0104-5
Scopus记录号: 2-s2.0-84930272786
论文题名: Benthic nitrogen metabolism in a macrophyte meadow (Vallisneria spiralis L.) under increasing sedimentary organic matter loads
作者: Soana E. ; Naldi M. ; Bonaglia S. ; Racchetti E. ; Castaldelli G. ; Brüchert V. ; Viaroli P. ; Bartoli M.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 124, 期: 2018-01-03 起始页码: 387
结束页码: 404
语种: 英语
英文关键词: Denitrification
; N fluxes
; N uptake
; Organic enrichment
; Radial oxygen loss
; Vallisneria spiralis
Scopus关键词: bacterium
; denitrification
; macrophyte
; meadow
; metabolism
; microbial community
; nitrogen cycle
; organic matter
; oxygen
; rhizosphere
; submerged vegetation
; suspended load
; Vallisneria spiralis
英文摘要: Organic enrichment may deeply affect benthic nitrogen (N) cycling in macrophyte meadows, either promoting N loss or its recycling. This depends upon the plasticity of plants and of the associated microbial communities, as those surrounding the rhizosphere. Rates of denitrification, dissolved inorganic N fluxes and N uptake were measured in sediments vegetated by the submerged macrophyte Vallisneria spiralis L. under increasing organic matter loads. The aim was to investigate how the combined N assimilation and denitrification, which subtract N via temporary retention and permanent removal, respectively, do vary along the gradient. Results showed that V. spiralis meadows act as regulators of benthic N cycling even in organic enriched sediments, with negative feedbacks for eutrophication. A moderate organic load stimulates N uptake and denitrification coupled to nitrification in the rhizosphere. This is due to a combination of weakened competition between macrophytes and N cycling bacteria and enhanced radial oxygen loss by roots. An elevated organic enrichment affects N uptake due to hostile conditions in pore water and plant stress and impairs N mineralisation and its removal via denitrification coupled to nitrification. However, the loss of plant performance is almost completely compensated by increased denitrification of water column nitrate, resulting in a shift between the relative relevance of temporary and permanent N removal processes. © 2015, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83495
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: Department of Life Sciences and Biotechnology, University of Ferrara, Via L. Borsari 46, Ferrara, Italy; Department of Life Sciences, University of Parma, Viale G.P. Usberti 33/A, Parma, Italy; Department of Geological Sciences, Stockholm University, Svante Arrheniusväg 8 C, Stockholm, Sweden
Recommended Citation:
Soana E.,Naldi M.,Bonaglia S.,et al. Benthic nitrogen metabolism in a macrophyte meadow (Vallisneria spiralis L.) under increasing sedimentary organic matter loads[J]. Biogeochemistry,2015-01-01,124(2018-01-03)