DOI: 10.1111/gcb.13323
论文题名: Is it getting hot in here? Adjustment of hydraulic parameters in six boreal and temperate tree species after 5 years of warming
作者: McCulloh K.A. ; Petitmermet J. ; Stefanski A. ; Rice K.E. ; Rich R.L. ; Montgomery R.A. ; Reich P.B.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2016
卷: 22, 期: 12 起始页码: 4124
结束页码: 4133
语种: 英语
英文关键词: Boreal Forest Warming at an Ecotone in Danger
; boreal–temperate ecotone
; conduit diameter
; elevated temperature
; hydraulic conductivity
; saplings
Scopus关键词: boreal forest
; ecotone
; hydraulic conductivity
; physiological response
; sapling
; temperate forest
; temperature effect
; warming
; Coniferophyta
; Magnoliophyta
; water
; anatomy and histology
; climate change
; forest
; Minnesota
; photosynthesis
; physiology
; temperature
; tree
; wood
; xylem
; Climate Change
; Forests
; Minnesota
; Photosynthesis
; Temperature
; Trees
; Water
; Wood
; Xylem
英文摘要: Global temperatures (T) are rising, and for many plant species, their physiological response to this change has not been well characterized. In particular, how hydraulic parameters may change has only been examined experimentally for a few species. To address this, we measured characteristics of the hydraulic architecture of six species growing in ambient T and ambient +3.4 °C T plots in two experimentally warmed forest sites in Minnesota. These sites are at the temperate–boreal ecotone, and we measured three species from each forest type. We hypothesized that relative to boreal species, temperate species near their northern range border would increase xylem conduit diameters when grown under elevated T. We also predicted a continuum of responses among wood types, with conduit diameter increases correlating with increases in the complexity of wood structure. Finally, we predicted that increases in conduit diameter and specific hydraulic conductivity would positively affect photosynthetic rates and growth. Our results generally supported our hypotheses, and conduit diameter increased under elevated T across all species, although this pattern was driven predominantly by three species. Two of these species were temperate angiosperms, but one was a boreal conifer, contrary to predictions. We observed positive relationships between the change in specific hydraulic conductivity and both photosynthetic rate (P = 0.080) and growth (P = 0.012). Our results indicate that species differ in their ability to adjust hydraulically to increases in T. Specifically, species with more complex xylem anatomy, particularly those individuals growing near the cooler edge of their range, appeared to be better able to increase conduit diameters and specific hydraulic conductivity, which permitted increases in photosynthesis and growth. Our data support results that indicate individual's ability to physiologically adjust is related to their location within their species range, and highlight that some wood types may adjust more easily than others. © 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/61237
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Botany, University of Wisconsin-Madison, Madison, WI, United States; Department of Forest Engineering, Resources, and Management, Oregon State University, Corvallis, OR, United States; Department of Forest Resources, University of Minnesota, St Paul, MN, United States; Smithsonian Environmental Research Center, Edgewater, MD, United States; Hawkesbury Institute for the Environment, University of Western Sydney, Penrith, NSW, Australia
Recommended Citation:
McCulloh K.A.,Petitmermet J.,Stefanski A.,et al. Is it getting hot in here? Adjustment of hydraulic parameters in six boreal and temperate tree species after 5 years of warming[J]. Global Change Biology,2016-01-01,22(12)