DOI: 10.1111/gcb.14906
论文题名: Wood anatomical traits in black spruce reveal latent water constraints on the boreal forest
作者: Puchi P.F. ; Castagneri D. ; Rossi S. ; Carrer M.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2020
卷: 26, 期: 3 语种: 英语
英文关键词: cell number
; cell wall thickness
; climate change
; dendroanatomy
; lumen area
; Picea mariana
; xylem
Scopus关键词: anatomy
; boreal forest
; cell organelle
; climate change
; climate effect
; forest ecosystem
; global change
; precipitation (climatology)
; tree ring
; Canada
; Quebec [Canada]
; Picea mariana
英文摘要: The effects of climate change on high-latitude forest ecosystems are complex, making forecasts of future scenarios uncertain. The predicted lengthening of the growing season under warming conditions is expected to increase tree growth rates. However, there is evidence of an increasing sensitivity of the boreal forest to drought stress. To assess the influence of temperature and precipitation on the growth of black spruce (Picea mariana), we investigated long-term series of wood anatomical traits on 20 trees from four sites along 600 km, the latitudinal range of the closed boreal forest in Quebec, Canada. We correlated the anatomical traits resolved at intraring level with daily temperature, vapor pressure deficit (VPD), and precipitation during the 1943–2010 period. Tree-ring width, number of cells per ring and cell wall thickness were positively affected by spring and summer daily mean and maximum temperature at the northern sites. These results agree with the well-known positive effect of high temperatures on tree ring formation at high latitudes. However, we captured, for the first time in this region, the latent impact of water availability on xylem traits. Indeed, in all the four sites, cell lumen area showed positive correlations with daily precipitation (mostly at low latitude), and/or negative correlations with daily mean and maximum temperature and VPD (mostly at high latitude). We inferred that drought, due to high temperatures, low precipitations, or both, negatively affects cell enlargement across the closed boreal forest, including the northernmost sites. The production of tracheids with narrower lumen, potentially more resistant to cavitation, could increase xylem hydraulic safety under a warmer and drier climate. However, this would result in lower xylem conductivity, with consequent long-term hydraulic deterioration, growth decline, and possibly lead to tree dieback, as observed in other forest ecosystems at lower latitudes. © 2019 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158914
Appears in Collections: 气候变化与战略
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作者单位: Dipartimento Territorio e Sistemi Agro-Forestali (TESAF), Universitá degli Studi di Padova, Padova, Italy; Swiss Federal Research Institute (WSL), Zurich, Switzerland; Département des Sciences Fondamentales, Université du Québec à Chicoutimi, Chicoutimi, QC, Canada; Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, China
Recommended Citation:
Puchi P.F.,Castagneri D.,Rossi S.,et al. Wood anatomical traits in black spruce reveal latent water constraints on the boreal forest[J]. Global Change Biology,2020-01-01,26(3)