DOI: 10.1111/gcb.13677
论文题名: Arctic shrub growth trajectories differ across soil moisture levels
作者: Ackerman D. ; Griffin D. ; Hobbie S.E. ; Finlay J.C.
刊名: Global Change Biology
出版年: 2017
卷: 23, 期: 10 起始页码: 4294
结束页码: 4302
语种: 英语
英文关键词: arctic
; biomass
; climate change
; dendroecology
; shrub expansion
; tundra
Scopus关键词: Salix pulchra
英文摘要: The circumpolar expansion of woody deciduous shrubs in arctic tundra alters key ecosystem properties including carbon balance and hydrology. However, landscape-scale patterns and drivers of shrub expansion remain poorly understood, inhibiting accurate incorporation of shrub effects into climate models. Here, we use dendroecology to elucidate the role of soil moisture in modifying the relationship between climate and growth for a dominant deciduous shrub, Salix pulchra, on the North Slope of Alaska, USA. We improve upon previous modeling approaches by using ecological theory to guide model selection for the relationship between climate and shrub growth. Finally, we present novel dendroecology-based estimates of shrub biomass change under a future climate regime, made possible by recently developed shrub allometry models. We find that S. pulchra growth has responded positively to mean June temperature over the past 2.5 decades at both a dry upland tundra site and an adjacent mesic riparian site. For the upland site, including a negative second-order term in the climate–growth model significantly improved explanatory power, matching theoretical predictions of diminishing growth returns to increasing temperature. A first-order linear model fit best at the riparian site, indicating consistent growth increases in response to sustained warming, possibly due to lack of temperature-induced moisture limitation in mesic habitats. These contrasting results indicate that S. pulchra in mesic habitats may respond positively to a wider range of temperature increase than S. pulchra in dry habitats. Lastly, we estimate that a 2°C increase in current mean June temperature will yield a 19% increase in aboveground S. pulchra biomass at the upland site and a 36% increase at the riparian site. Our method of biomass estimation provides an important link toward incorporating dendroecology data into coupled vegetation and climate models. © 2017 John Wiley & Sons Ltd 资助项目: Ackerman, D.
; Department of Ecology, Evolution, and Behavior, University of MinnesotaUnited States
; 电子邮件: dackerma@umn.edu
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60778
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Ecology, Evolution, and Behavior, University of Minnesota, Saint Paul, MN, United States; Department of Geography, Environment and Society, University of Minnesota, Minneapolis, MN, United States
Recommended Citation:
Ackerman D.,Griffin D.,Hobbie S.E.,et al. Arctic shrub growth trajectories differ across soil moisture levels[J]. Global Change Biology,2017-01-01,23(10)