DOI: 10.1016/j.foreco.2013.12.034
Scopus记录号: 2-s2.0-84892648844
论文题名: Nitrogen translocation and accumulation by a cord-forming fungus (Hypholoma fasciculare) into simulated woody debris
作者: Philpott T.J. ; Prescott C.E. ; Chapman W.K. ; Grayston S.J.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2014
卷: 315 起始页码: 121
结束页码: 128
语种: 英语
英文关键词: Fugnal ecology
; Nitrogen translocation
; Wood decomposition
; Woody debris management
Scopus关键词: Carbon limitation
; Fungal colonization
; Management objectives
; Pseudotsuga menziesii
; Saprotrophic fungi
; Site preparation
; Wood decompositions
; Woody debris
; Amino acids
; Debris
; Forestry
; Fungi
; Nitrogen
; Wood
; Decay (organic)
; bioaccumulation
; decomposition
; forest floor
; fungus
; immobilization
; inoculation
; nitrogen
; soil microorganism
; translocation
; woody debris
; Amino Acids
; Decay
; Forestry
; Fungi
; Nitrogen
; Wood
英文摘要: Nitrogen (N) accumulation into woody debris is well documented, but the forms of N translocated, the mechanism through which this occurs (purportedly via translocation by cord-forming fungi) and the temporal pattern of N accumulation are not well studied. In soil microcosms, we incubated wood blocks (Pseudotsuga menziesii) inoculated with the cord-forming decay fungus Hypholoma fasciculare, and applied four forms of isotopically-labeled N (15NH4+, 15NO3-, 15N-glycine and 15N labeled litter) at the mycelial growing fronts to evaluate translocation and accumulation of diverse N sources by wood-decay fungi. Identically treated un-inoculated wood blocks were incubated. Three sampling times (6, 18 and 30days after N addition) were used to identify trends in 15N transfer and total N accumulation. Wood blocks inoculated with H. fasciculare assimilated significantly more 15N than un-inoculated blocks for all 15N treatments on at least one sampling occasion. After a total of 73days of incubation in microcosms, inoculated wood blocks increased in absolute N content by 211% relative to control blocks, but 80% of this accumulated N was lost by day 97. The small amount of 15N that was transferred into wood contrasted with the large increase in total N, suggesting that the site of N transfer was largely from soil under the wood blocks rather than at the site of 15N injection. The precipitous decline in N content was attributed to visible indications of mycelial senescence, possibly due to carbon limitation. If these findings are extrapolated to a cut-block, it follows that woody debris on the forest floor colonized by wood decay fungi would accumulate N, at least in the early stages of decay, and this process may immobilize N after harvest. If retention of N on site after harvest is a management objective, site preparation that maximizes accumulation of N in woody debris by saprotrophic fungi should be employed. This would involve homogenously distributing woody debris on site in close contact with the forest floor in order to promote fungal colonization and N accumulation. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/66124
Appears in Collections: 影响、适应和脆弱性
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作者单位: Belowground Ecosystem Group, Department of Forest and Conservation Sciences, Faculty of Forestry, University of British Columbia, 2424 Main Mall, Vancouver, BC V6T 1Z4, Canada; Research Section, BC Ministry of Forests, Williams Lake, BC V2G 4T1, Canada
Recommended Citation:
Philpott T.J.,Prescott C.E.,Chapman W.K.,et al. Nitrogen translocation and accumulation by a cord-forming fungus (Hypholoma fasciculare) into simulated woody debris[J]. Forest Ecology and Management,2014-01-01,315