DOI: 10.1111/gcb.13749
论文题名: Phenological responses of Icelandic subarctic grasslands to short-term and long-term natural soil warming
作者: Leblans N.I.W. ; Sigurdsson B.D. ; Vicca S. ; Fu Y. ; Penuelas J. ; Janssens I.A.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
语种: 英语
英文关键词: Climate change
; Geothermal warming
; Iceland
; Normalized difference vegetation index
; Phenology
; Subarctic grassland
英文摘要: The phenology of vegetation, particularly the length of the growing season (LOS; i.e., the period from greenup to senescence), is highly sensitive to climate change, which could imply potent feedbacks to the climate system, for example, by altering the ecosystem carbon (C) balance. In recent decades, the largest extensions of LOS have been reported at high northern latitudes, but further warming-induced LOS extensions may be constrained by too short photoperiod or unfulfilled chilling requirements. Here, we studied subarctic grasslands, which cover a vast area and contain large C stocks, but for which LOS changes under further warming are highly uncertain. We measured LOS extensions of Icelandic subarctic grasslands along natural geothermal soil warming gradients of different age (short term, where the measurements started after 5 years of warming and long term, i.e., warmed since ≥50 years) using ground-level measurements of normalized difference vegetation index. We found that LOS linearly extended with on average 2.1 days per °C soil warming up to the highest soil warming levels (ca. +10°C) and that LOS had the potential to extend at least 1 month. This indicates that the warming impact on LOS in these subarctic grasslands will likely not saturate in the near future. A similar response to short- and long-term warming indicated a strong physiological control of the phenological response of the subarctic grasslands to warming and suggested that genetic adaptations and community changes were likely of minor importance. We conclude that the warming-driven extension of the LOSs of these subarctic grasslands did not saturate up to +10°C warming, and hence that growing seasons of high-latitude grasslands are likely to continue lengthening with future warming (unless genetic adaptations or species shifts do occur). This persistence of the warming-induced extension of LOS has important implications for the C-sink potential of subarctic grasslands under climate change. © 2017 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61101
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Biology University of Antwerp Wijlrijk Belgium; Agricultural University of Iceland Borgarnes Iceland; Sino-French Institute for Earth System Science College of Urban and Environmental Sciences Peking University Beijing China; CREAF Catalonia Spain; Global Ecology Unit CSIC Catalonia Spain
Recommended Citation:
Leblans N.I.W.,Sigurdsson B.D.,Vicca S.,et al. Phenological responses of Icelandic subarctic grasslands to short-term and long-term natural soil warming[J]. Global Change Biology,2017-01-01