Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1016/j.foreco.2017.01.011 |
Does CWD mediate microclimate for epixylic vegetation in boreal forest understories? A test of the moisture-capacitor hypothesis | |
Haughian, Sean R.; Frego, Katherine A. | |
2017-04-01 | |
发表期刊 | FOREST ECOLOGY AND MANAGEMENT |
ISSN | 0378-1127 |
EISSN | 1872-7042 |
出版年 | 2017 |
卷号 | 389 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada |
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. (C) 2017 Elsevier B.V. All rights reserved. |
英文关键词 | Epixylic Coarse woody debris Bryophyte Lichen Boreal Plant-climate interactions |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000398868800034 |
WOS关键词 | COARSE WOODY DEBRIS ; DEAD WOOD ; FALLEN LOGS ; SUBSTRATE-SPECIFICITY ; BRYOPHYTE COMMUNITY ; SPECIES-DIVERSITY ; DECAYING WOOD ; NATIONAL-PARK ; CONIFER LOGS ; MOSS |
WOS类目 | Forestry |
WOS研究方向 | Forestry |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/22346 |
专题 | 气候变化 |
作者单位 | Univ New Brunswick, Dept Biol, POB 5050, St John, NB E2L 4L5, Canada |
推荐引用方式 GB/T 7714 | Haughian, Sean R.,Frego, Katherine A.. Does CWD mediate microclimate for epixylic vegetation in boreal forest understories? A test of the moisture-capacitor hypothesis[J]. FOREST ECOLOGY AND MANAGEMENT,2017,389. |
APA | Haughian, Sean R.,&Frego, Katherine A..(2017).Does CWD mediate microclimate for epixylic vegetation in boreal forest understories? A test of the moisture-capacitor hypothesis.FOREST ECOLOGY AND MANAGEMENT,389. |
MLA | Haughian, Sean R.,et al."Does CWD mediate microclimate for epixylic vegetation in boreal forest understories? A test of the moisture-capacitor hypothesis".FOREST ECOLOGY AND MANAGEMENT 389(2017). |
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