DOI: 10.1016/j.foreco.2017.01.011
Scopus记录号: 2-s2.0-85009786931
论文题名: Does CWD mediate microclimate for epixylic vegetation in boreal forest understories? A test of the moisture-capacitor hypothesis
作者: Haughian S.R. ; Frego K.A.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2017
卷: 389 起始页码: 341
结束页码: 351
语种: 英语
英文关键词: Boreal
; Bryophyte
; Coarse woody debris
; Epixylic
; Lichen
; Plant-climate interactions
Scopus关键词: Debris
; Floors
; Fungi
; Moisture
; Moisture determination
; Plants (botany)
; Vegetation
; Boreal
; Bryophyte
; Coarse woody debris
; Epixylic
; Lichen
; Forestry
; boreal forest
; bryophyte
; coarse woody debris
; ecological impact
; forest floor
; functional group
; hypothesis testing
; lichen
; microclimate
; moisture
; moisture content
; understory
; bryophytes
英文摘要: Coarse woody debris (CWD) is an important microhabitat in forests, particularly for bryophytes and lichens. Many have suggested that this is because CWD provides a uniquely stable and humid surface microclimate, which facilitates epixylic flora, although few have adequately tested this hypothesis. Consequently, it is uncertain whether the apparent relationship between CWD and epixylic vegetation is because CWD regulates moisture, or because moisture is simply correlated with other important CWD traits. This study tested the moisture-capacitor hypothesis of epixylic flora-CWD association by measuring the surface moisture availability directly on CWD under thinned and unthinned forest canopies, and (1) comparing (a) cumulative moisture levels, and (b) variation in moisture levels with ambient and adjacent forest floor microclimates, (2) testing whether associations with log and canopy properties are stronger through direct or indirect pathways, and (3) testing whether desiccation-sensitive functional groups respond more strongly to surface moisture than other groups. Path models were built using canopy cover and log physical traits (log covering, size, acidity, and hardness) as predictors, surface moisture indices as mediators, and epixylic functional group cover as outcome variables. Forest floor and CWD microclimates were equally stable and humid, regardless of canopy cover. Log and canopy properties were more strongly related to epixylic group cover directly than indirectly (through surface moisture). Synthesis: The CWD moisture-capacitor hypothesis is rejected: CWD traits can influence surface moisture availability, but (1) log surface moisture does not differ from the forest floor, and (2) log and canopy properties are more strongly associated with epixylic taxa directly than as mediated through microclimate. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64468
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Biology, University of New Brunswick, P.O. Box 5050, Saint John, NB, Canada
Recommended Citation:
Haughian S.R.,Frego K.A.. Does CWD mediate microclimate for epixylic vegetation in boreal forest understories? A test of the moisture-capacitor hypothesis[J]. Forest Ecology and Management,2017-01-01,389