DOI: 10.1007/s10533-017-0393-y
Scopus记录号: 2-s2.0-85031933147
论文题名: Nitrogen fixation in the High Arctic: a source of ‘new’ nitrogen?
作者: Rousk K. ; Sorensen P.L. ; Michelsen A.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 136, 期: 2 起始页码: 213
结束页码: 222
语种: 英语
英文关键词: Acetylene reduction
; Arctic
; Bryophytes
; Cyanobacteria
; Nitrogen fixation
; Nitrogen isotopes
; Stable isotopes
; Tundra
Scopus关键词: acetylene
; bioassay
; bryophyte
; cyanobacterium
; ecosystem dynamics
; growing season
; nitrogen
; nitrogen fixation
; nitrogen isotope
; pristine environment
; stable isotope
; tundra
; vegetation type
; Arctic
; Bryophyta
; bryophytes
; Cyanobacteria
; Gossypium hirsutum
英文摘要: Biological nitrogen (N2) fixation performed by diazotrophs (N2 fixing bacteria) is thought to be one of the main sources of plant available N in pristine ecosystems like arctic tundra. However, direct evidence of a transfer of fixed N2 to non-diazotroph associated plants is lacking to date. Here, we present results from an in situ 15N–N2 labelling study in the High Arctic. Three dominant vegetation types (organic crust composed of free-living cyanobacteria, mosses, cotton grass) were subjected to acetylene reduction assays (ARA) performed regularly throughout the growing season, as well as 15N–N2 incubations. The 15N-label was followed into the dominant N2 fixer associations, soil, soil microbial biomass and non-diazotroph associated plants three days and three weeks after labelling. Mosses contributed most to habitat N2 fixation throughout the measuring campaigns, and N2 fixation activity was highest at the beginning of the growing season in all plots. Fixed 15N–N2 became quickly (within 3 days) available to non-diazotroph associated plants in all investigated vegetation types, proving that N2 fixation is an actual source of available N in pristine ecosystems. © 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/83215
Appears in Collections: 气候减缓与适应 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Biology, Terrestrial Ecology Section, University of Copenhagen, Universitetsparken 15, Copenhagen, Denmark; Center for Permafrost (CENPERM), University of Copenhagen, Øster Voldgade 10, Copenhagen, Denmark
Recommended Citation:
Rousk K.,Sorensen P.L.,Michelsen A.. Nitrogen fixation in the High Arctic: a source of ‘new’ nitrogen?[J]. Biogeochemistry,2017-01-01,136(2)