DOI: 10.1111/gcb.13540
论文题名: The competitive status of trees determines their responsiveness to increasing atmospheric humidity – a climate trend predicted for northern latitudes
作者: Tullus A. ; Kupper P. ; Kaasik A. ; Tullus H. ; Lõhmus K. ; Sõber A. ; Sellin A.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期: 5 起始页码: 1961
结束页码: 1974
语种: 英语
英文关键词: Betula pendula
; climate change
; climate manipulation
; elevated air humidity
; interactive effects
; intraspecific competition
; Populus tremula × P. tremuloides
; tree–tree competition
Scopus关键词: Betula
; Betula pendula
; Populus
; Populus tremula
英文摘要: The interactive effects of climate variables and tree–tree competition are still insufficiently understood drivers of forest response to global climate change. Precipitation and air humidity are predicted to rise concurrently at high latitudes of the Northern Hemisphere. We investigated whether the growth response of deciduous trees to elevated air humidity varies with their competitive status. The study was conducted in seed-originated silver birch and monoclonal hybrid aspen stands grown at the free air humidity manipulation (FAHM) experimental site in Estonia, in which manipulated stands (n = 3 for both species) are exposed to artificially elevated relative air humidity (6–7% over the ambient level). The study period included three growing seasons during which the stands had reached the competitive stage (trees were 7 years old in the final year). A significant ‘treatment×competitive status’ interactive effect on growth was detected in all years in birch (P < 0.01) and in one year in aspen stands (P = 0.015). Competitively advantaged trees were always more strongly affected by elevated humidity. Initially the growth of advantaged and neutral trees of both species remained significantly suppressed in humidified stands. In the following years, dominance and elevated humidity had a synergistic positive effect on the growth of birches. Aspens with different competitive status recovered more uniformly, attaining similar relative growth rates in manipulated and control stands, but preserved a significantly lower total growth yield due to severe initial growth stress. Disadvantaged trees of both species were never significantly affected by elevated humidity. Our results suggest that air humidity affects trees indirectly depending on their social status. Therefore, the response of northern temperate and boreal forests to a more humid climate in future will likely be modified by competitive relationships among trees, which may potentially affect species composition and cause a need to change forestry practices. © 2016 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60977
Appears in Collections: 影响、适应和脆弱性
There are no files associated with this item.
作者单位: Institute of Ecology and Earth Sciences, University of Tartu, Lai 40, Tartu, Estonia; Institute of Forestry and Rural Engineering, Estonian University of Life Sciences, Kreutzwaldi 5, Tartu, Estonia
Recommended Citation:
Tullus A.,Kupper P.,Kaasik A.,et al. The competitive status of trees determines their responsiveness to increasing atmospheric humidity – a climate trend predicted for northern latitudes[J]. Global Change Biology,2017-01-01,23(5)