DOI: 10.1111/gcb.12805
论文题名: Factors affecting fall down rates of dead aspen (Populus tremuloides) biomass following severe drought in west-central Canada
作者: Hogg E.H. ; Michaelian M.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 5 起始页码: 1968
结束页码: 1979
语种: 英语
英文关键词: Populus tremuloides
; Aspen
; Boreal forest
; Carbon cycling
; Decay fungi
; Drought
; Mortality
; Snag
Scopus关键词: biomass
; boreal forest
; carbon cycle
; carbon emission
; drought
; fungus
; mortality
; remote sensing
; satellite data
; Canada
; Fungi
; Hexapoda
; Phellinus tremulae
; Populus
; Populus tremuloides
; carbon
; age
; Basidiomycetes
; biomass
; Canada
; chemistry
; drought
; metabolism
; microbiology
; mortality
; physiology
; Populus
; wind
; Age Factors
; Basidiomycota
; Biomass
; Canada
; Carbon
; Droughts
; Populus
; Wind
英文摘要: Increases in mortality of trembling aspen (Populus tremuloides Michx.) have been recorded across large areas of western North America following recent periods of exceptionally severe drought. The resultant increase in standing, dead tree biomass represents a significant potential source of carbon emissions to the atmosphere, but the timing of emissions is partially driven by dead-wood dynamics which include the fall down and breakage of dead aspen stems. The rate at which dead trees fall to the ground also strongly influences the period over which forest dieback episodes can be detected by aerial surveys or satellite remote sensing observations. Over a 12-year period (2000-2012), we monitored the annual status of 1010 aspen trees that died during and following a severe regional drought within 25 study areas across west-central Canada. Observations of stem fall down and breakage (snapping) were used to estimate woody biomass transfer from standing to downed dead wood as a function of years since tree death. For the region as a whole, we estimated that >80% of standing dead aspen biomass had fallen after 10 years. Overall, the rate of fall down was minimal during the year following stem death, but thereafter fall rates followed a negative exponential equation with k = 0.20 per year. However, there was high between-site variation in the rate of fall down (k = 0.08-0.37 per year). The analysis showed that fall down rates were positively correlated with stand age, site windiness, and the incidence of decay fungi (Phellinus tremulae (Bond.) Bond. and Boris.) and wood-boring insects. These factors are thus likely to influence the rate of carbon emissions from dead trees following periods of climate-related forest die-off episodes. © 2014 John Wiley & Sons Ltd Reproduced with the permission of the Minister of Natural Resources Canada. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61884
Appears in Collections: 影响、适应和脆弱性
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作者单位: Natural Resources Canada, Canadian Forest Service, 5320-122 Street, Edmonton, AB, Canada
Recommended Citation:
Hogg E.H.,Michaelian M.. Factors affecting fall down rates of dead aspen (Populus tremuloides) biomass following severe drought in west-central Canada[J]. Global Change Biology,2015-01-01,21(5)