DOI: 10.1016/j.foreco.2013.02.035
Scopus记录号: 2-s2.0-84876791724
论文题名: Relations among soil microbial community composition, nitrogen turnover, and tree growth in N-loaded and previously N-loaded boreal spruce forest
作者: Blaško R. ; Högberg P. ; Bach L.H. ; Högberg M.N.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2013
卷: 302 起始页码: 319
结束页码: 328
语种: 英语
英文关键词: 15N natural abundance
; 15N pool dilution
; Fungi/bacteria ratio
; Gross nitrogen mineralization
; Long-term nitrogen fertilization
; Stem wood production
Scopus关键词: Microbial community composition
; Microbial N immobilization
; Natural abundance
; Nitrogen fertilization
; Nitrogen mineralization
; Soil microbial community
; Soil microbial community compositions
; Stem wood production
; Bacteria
; Biogeochemistry
; Biological materials
; Fungi
; Lakes
; Mineralogy
; Needles
; Nitrogen
; Organic compounds
; Recovery
; Soils
; Forestry
; bacterium
; biomarker
; biomass allocation
; boreal forest
; decomposition
; fungus
; immobilization
; microbial community
; mycorrhiza
; nitrogen
; rhizosphere
; soil chemistry
; soil microorganism
; symbiosis
; turnover
; Bacteria
; Forestry
; Fungi
; Lakes
; Needles
; Nitrogen
; Organic Compounds
; Recovery
; Soil
; Sweden
; Bacteria (microorganisms)
; Fungi
; Picea
; Picea abies
; Posibacteria
英文摘要: Nitrogen (N) deposition on forests decreases the decomposition of organic matter, and may therefore decrease N mineralization. However, a higher N supply also meets the N demands of soil microbes, which may increase N mineralization, especially if the trees reduce their carbon allocation to mycorrhizal fungi and other biotic N sinks in the rhizosphere. We report effects of high continuous N load and of termination of N load on stem wood volume, foliar and soil chemistry, gross N turnover, and soil microbial communities in a boreal Norway spruce forest in Sweden. Ammonium nitrate had been applied annually for 42years at average rates of 34kgha-1year-1 of N to the N1 plots, and for two decades at 73 and 108kgha-1year-1 of N to N2 and N3 plots, respectively. Treatments N2 and N3 were terminated 19 and 17years before the study, which enabled us to study the recovery from the previous high N load.Stem growth responded strongly to N additions and correlated to gross N mineralization and microbial community composition. Total stem volume measured in 2010 was 299, 483, 470, and 376m3ha-1, in N0 (control), N1, N2, and N3 plots, respectively. In N-limited control plots with high soil C/N ratio and low soil and needle N concentrations, we observed lower gross N mineralization rate and lower recovery of non-immobilized tracer in the soil ammonium pool, which indicates a high microbial N immobilization capacity. Commonly, microbial biomarkers decline after N addition, which was also found here, whereas total abundance was highest in high N plots with thick mor-layer. Contrary to our expectation the fungi/bacteria ratio was not lower, because fungi and bacteria declined concurrently and to the same extent. As we expected, soils in N amended plots had higher relative amounts of gram-positive bacteria than in control plots. Termination of N additions caused a reduction in gross N mineralization and needle N. Lower 15N abundance in needles compared with the mor-layer indicated a recovery of the function of ectomycorrhizal symbiosis.We propose that the higher gross N mineralization rate in N-loaded forest is not caused by greater decomposition of organic matter, but a higher internal turnover of microbial N. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/66545
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden; Department of Ecology and Environmental Sciences, Umeå University, SE-901 87 Umeå, Sweden
Recommended Citation:
Blaško R.,Högberg P.,Bach L.H.,et al. Relations among soil microbial community composition, nitrogen turnover, and tree growth in N-loaded and previously N-loaded boreal spruce forest[J]. Forest Ecology and Management,2013-01-01,302