Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1016/j.foreco.2017.04.005 |
Gap regeneration within mature deciduous forests of Interior Alaska: Implications for future forest change | |
Alexander, Heather D.1; Mack, Michelle C.2 | |
2017-07-15 | |
发表期刊 | FOREST ECOLOGY AND MANAGEMENT |
ISSN | 0378-1127 |
EISSN | 1872-7042 |
出版年 | 2017 |
卷号 | 396 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Increased fire severity in boreal forests of Interior Alaska is shifting forest canopy composition from black spruce (Picea mariana) to deciduous species, including trembling aspen (Populus tremuloides) and Alaska paper birch (Betula neoalaskana). Because deciduous trees are less flammable than black spruce, the dominant disturbance regime in deciduous forests could move away from fire to one of gap disturbances. In this study, we quantified forest gap characteristics and vegetation within eight mature (62-119-yr-old) deciduous stands in Interior Alaska. Canopy gaps were generally small (true gap area <50 m(2)), formed by the mortality of 4-16 gap makers (which were always deciduous trees), and occupied similar to 17-29% of the forest except in the oldest stand, where gap fraction exceeded 45%, and in one anomalous 84-yr old stand, where gaps were absent. Canopy openness increased linearly with gap area, but density of both deciduous and evergreen tree recruits was generally low and insufficient to create future stands with densities similar to those currently found in mature stands across the landscape. Canopy openness was instead correlated with decreased leaf litter cover and increased cover of moss, lichen, and evergreen shrubs. Given the low recruitment of trees with canopy gaps and the decreased probability of fire, deciduous stands will likely "transition to non-forested areas or low density stands once overstory trees reach maturity and die. This could have numerous implications for ecosystem function, including carbon (C), water, and energy balance, and potential feedbacks to future fire occurrence and regional climate. (C) 2017 Elsevier B.V. All rights reserved. |
英文关键词 | Canopy gaps Boreal forest Alaska Fire Successional trajectory Black spruce |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000402217100004 |
WOS关键词 | CANADIAN BOREAL FOREST ; SOIL BURN SEVERITY ; FIRE SEVERITY ; WHITE SPRUCE ; GROWTH ; STANDS ; CARBON ; ASPEN ; PRODUCTIVITY ; RECRUITMENT |
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/23201 |
专题 | 气候变化 |
作者单位 | 1.Mississippi State Univ, Dept Forestry, Forest & Wildlife Res Ctr, Mississippi State, MS 39762 USA; 2.No Arizona Univ, Ctr Ecosyst Sci & Soc, 224 Peterson Hall, Flagstaff, AZ 86011 USA |
推荐引用方式 GB/T 7714 | Alexander, Heather D.,Mack, Michelle C.. Gap regeneration within mature deciduous forests of Interior Alaska: Implications for future forest change[J]. FOREST ECOLOGY AND MANAGEMENT,2017,396. |
APA | Alexander, Heather D.,&Mack, Michelle C..(2017).Gap regeneration within mature deciduous forests of Interior Alaska: Implications for future forest change.FOREST ECOLOGY AND MANAGEMENT,396. |
MLA | Alexander, Heather D.,et al."Gap regeneration within mature deciduous forests of Interior Alaska: Implications for future forest change".FOREST ECOLOGY AND MANAGEMENT 396(2017). |
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