DOI: 10.1007/s10533-017-0391-0
Scopus记录号: 2-s2.0-85032358644
论文题名: Short-term carbon input increases microbial nitrogen demand, but not microbial nitrogen mining, in a set of boreal forest soils
作者: Wild B. ; Alaei S. ; Bengtson P. ; Bodé S. ; Boeckx P. ; Schnecker J. ; Mayerhofer W. ; Rütting T.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 136, 期: 3 起始页码: 261
结束页码: 278
语种: 英语
英文关键词: Ammonification
; Boreal forest
; Microbial N mining
; N mineralization
; Organic N
; Priming
; Protein depolymerization
Scopus关键词: ammonification
; biomass allocation
; boreal forest
; carbon dioxide
; carbon sequestration
; enzyme activity
; forest soil
; nitrogen
; polymer
; polymerization
; protein
; soil microorganism
; soil organic matter
; Embryophyta
英文摘要: Rising carbon dioxide (CO2) concentrations and temperatures are expected to stimulate plant productivity and ecosystem C sequestration, but these effects require a concurrent increase in N availability for plants. Plants might indirectly promote N availability as they release organic C into the soil (e.g., by root exudation) that can increase microbial soil organic matter (SOM) decomposition (“priming effect”), and possibly the enzymatic breakdown of N-rich polymers, such as proteins, into bio-available units (“N mining”). We tested the adjustment of protein depolymerization to changing soil C and N availability in a laboratory experiment. We added easily available C or N sources to six boreal forest soils, and determined soil organic C mineralization, gross protein depolymerization and gross ammonification rates (using 15N pool dilution assays), and potential extracellular enzyme activities after 1 week of incubation. Added C sources were 13C-labelled to distinguish substrate from soil derived C mineralization. Observed effects reflect short-term adaptations of non-symbiotic soil microorganisms to increased C or N availability. Although C input promoted microbial growth and N demand, we did not find indicators of increased N mobilization from SOM polymers, given that none of the soils showed a significant increase in protein depolymerization, and only one soil showed a significant increase in N-targeting enzymes. Instead, our findings suggest that microorganisms immobilized the already available N more efficiently, as indicated by decreased ammonification and inorganic N concentrations. Likewise, although N input stimulated ammonification, we found no significant effect on protein depolymerization. Although our findings do not rule out in general that higher plant-soil C allocation can promote microbial N mining, they suggest that such an effect can be counteracted, at least in the short term, by increased microbial N immobilization, further aggravating plant N limitation. © 2017, The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83204
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 Earth Sciences, University of Gothenburg, Gothenburg, Sweden; Department of Environmental Science and Analytical Chemistry, Stockholm University, Stockholm, Sweden; Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Department of Biology, Lund University, Lund, Sweden; Isotope Bioscience Laboratory, Ghent University, Ghent, Belgium; Department of Microbiology and Ecosystem Science, University of Vienna, Vienna, Austria; Department of Natural Resources and the Environment, University of New Hampshire, Durham, NH, United States
Recommended Citation:
Wild B.,Alaei S.,Bengtson P.,et al. Short-term carbon input increases microbial nitrogen demand, but not microbial nitrogen mining, in a set of boreal forest soils[J]. Biogeochemistry,2017-01-01,136(3)