DOI: 10.1111/gcb.14058
Scopus记录号: 2-s2.0-85041912131
论文题名: Arctic moistening provides negative feedbacks to riparian plants
作者: Helama S. ; Arppe L. ; Mielikäinen K. ; Oinonen M.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 6 起始页码: 2691
结束页码: 2707
语种: 英语
英文关键词: Arctic moistening
; dendroecology
; hydrological cycle
; Lapland
; Pinus sylvestris
; subarctic
; water level
; waterlogging
Scopus关键词: arctic environment
; biomass
; coniferous tree
; dendroecology
; hydrological cycle
; riparian vegetation
; subarctic region
; warming
; water level
; waterlogging
; Lapland [Eurasia]
; Pinus sylvestris
英文摘要: Arctic moistening will affect the circumpolar forested riparian ecosystems. Upward trends observed for precipitation in high latitudes illustrate that the moistening may be underway to influence the woody biomass production near the inland waters, lakes and streams with effects on carbon pools and fluxes. Although the flooding and waterlogging tolerance of seedlings has been investigated, our understanding of responses in mature trees is still limited. Here we employ tree-ring δ13C and width data from a subarctic riparian setting in Lapland, where artificially high lake level (HLL) has already altered the ecophysiological and growth responses of riparian Pinus sylvestris trees to external drivers under conditions simulating moister environment. Prior to the HLL event, the carbon assimilation rate was primarily limited by irradiance as reflected in the δ13C data and the radial growth of south-facing riparian trees remained increased in comparison to shaded upland trees. By contrast, the riparian trees were not similarly benefited during the HLL period when reduced assimilation depleted the riparian in comparison to upland δ13C despite of increased irradiance. As a result, the radial growth of riparian trees was markedly reduced over the HLL event while the upland trees benefited from increased irradiance and summer time warming. Although the production of biomass at high latitudes is commonly considered temperature-limited, our results highlight the increasing role of Arctic moistening to limit the growth when increased precipitation (cloudiness) reduces the incoming solar radiation in general and when the riparian habitat becomes increasingly waterlogged in particular. The effects of high-latitude warming to induce higher biomass productivity may be restricted by negative feedbacks. © 2018 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110378
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Natural Resources Institute Finland, Rovaniemi, Finland; Laboratory of Chronology, Finnish Museum of Natural History, University of Helsinki, Helsinki, Finland; Natural Resources Institute Finland, Vantaa, Finland
Recommended Citation:
Helama S.,Arppe L.,Mielikäinen K.,et al. Arctic moistening provides negative feedbacks to riparian plants[J]. Global Change Biology,2018-01-01,24(6)