DOI: 10.1111/gcb.12404
论文题名: Disturbance legacies and climate jointly drive tree growth and mortality in an intensively studied boreal forest
作者: Bond-Lamberty B. ; Rocha A.V. ; Calvin K. ; Holmes B. ; Wang C. ; Goulden M.L.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2014
卷: 20, 期: 1 起始页码: 216
结束页码: 227
语种: 英语
英文关键词: Boreal forest
; Carbon cycling
; Climate change
; Dendrology
; Disturbance
; Forest mortality
; Machine learning
Scopus关键词: air temperature
; boreal forest
; carbon cycle
; carbon sequestration
; climate change
; climate effect
; environmental disturbance
; mortality
; population dynamics
; population growth
; Canada
; Picea mariana
; algorithm
; article
; Canada
; carbon cycle
; climate
; growth, development and aging
; spruce
; temperature
; tree
; Algorithms
; Carbon Cycle
; Climate
; Manitoba
; Picea
; Temperature
; Trees
英文摘要: Most North American forests are at some stage of post-disturbance regrowth, subject to a changing climate, and exhibit growth and mortality patterns that may not be closely coupled to annual environmental conditions. Distinguishing the possibly interacting effects of these processes is necessary to put short-term studies in a longer term context, and particularly important for the carbon-dense, fire-prone boreal forest. The goals of this study were to combine dendrochronological sampling, inventory records, and machine-learning algorithms to understand how tree growth and death have changed at one highly studied site (Northern Old Black Spruce, NOBS) in the central Canadian boreal forest. Over the 1999-2012 inventory period, mean tree diameter increased even as stand density and basal area declined significantly. Tree mortality averaged 1.4 ± 0.6% yr-1, with most mortality occurring in medium-sized trees; new recruitment was minimal. There have been at least two, and probably three, significant influxes of new trees since stand initiation, but none in recent decades. A combined tree ring chronology constructed from sampling in 2001, 2004, and 2012 showed several periods of extreme growth depression, with increased mortality lagging depressed growth by ~5 years. Higher minimum and maximum air temperatures exerted a negative influence on tree growth, while precipitation and climate moisture index had a positive effect; both current- and previous-year data exerted significant effects. Models based on these variables explained 23-44% of the ring-width variability. We suggest that past climate extremes led to significant mortality still visible in the current forest structure, with decadal dynamics superimposed on slower patterns of fire and succession. These results have significant implications for our understanding of previous work at NOBS, the carbon sequestration capability of old-growth stands in a disturbance-prone landscape, and the sustainable management of regional forests in a changing climate. © 2013 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62068
Appears in Collections: 影响、适应和脆弱性
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作者单位: Pacific Northwest National Laboratory, Joint Global Change Research Institute at the University of Maryland-College Park, 5825 University Research Court, College Park, MD, 20740, United States; Department of Biological Sciences and the Environmental Change Initiative, University of Notre Dame, 100 Galvin Life Sciences Center, Notre Dame, IN, 46556, United States; Manitoba Conservation, 59 Elizabeth Drive, Thompson, MB, R8N 1X4, Canada; Center for Ecological Research, Northeast Forestry University, Harbin, 150040, China; Department of Earth System Science, University of California, Irvine, CA, 92697, United States
Recommended Citation:
Bond-Lamberty B.,Rocha A.V.,Calvin K.,et al. Disturbance legacies and climate jointly drive tree growth and mortality in an intensively studied boreal forest[J]. Global Change Biology,2014-01-01,20(1)