DOI: 10.1111/gcb.14001
Scopus记录号: 2-s2.0-85038808753
论文题名: Peak season plant activity shift towards spring is reflected by increasing carbon uptake by extratropical ecosystems
作者: Gonsamo A. ; Chen J.M. ; Ooi Y.W.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 5 起始页码: 2117
结束页码: 2128
语种: 英语
英文关键词: carbon uptake
; CMIP5
; CO2 seasonality
; earth system model
; peak season
; plant phenology
; Point Barrow station
; δ13C
英文摘要: Climate change is lengthening the growing season of the Northern Hemisphere extratropical terrestrial ecosystems, but little is known regarding the timing and dynamics of the peak season of plant activity. Here, we use 34-year satellite normalized difference vegetation index (NDVI) observations and atmospheric CO2 concentration and δ13C isotope measurements at Point Barrow (Alaska, USA, 71°N) to study the dynamics of the peak of season (POS) of plant activity. Averaged across extratropical (>23°N) non-evergreen-dominated pixels, NDVI data show that the POS has advanced by 1.2 ± 0.6 days per decade in response to the spring-ward shifts of the start (1.0 ± 0.8 days per decade) and end (1.5 ± 1.0 days per decade) of peak activity, and the earlier onset of the start of growing season (1.4 ± 0.8 days per decade), while POS maximum NDVI value increased by 7.8 ± 1.8% for 1982–2015. Similarly, the peak day of carbon uptake, based on calculations from atmospheric CO2 concentration and δ13C data, is advancing by 2.5 ± 2.6 and 4.3 ± 2.9 days per decade, respectively. POS maximum NDVI value shows strong negative relationships (p <.01) with the earlier onset of the start of growing season and POS days. Given that the maximum solar irradiance and day length occur before the average POS day, the earlier occurrence of peak plant activity results in increased plant productivity. Both the advancing POS day and increasing POS vegetation greenness are consistent with the shifting peak productivity towards spring and the increasing annual maximum values of gross and net ecosystem productivity simulated by coupled Earth system models. Our results further indicate that the decline in autumn NDVI is contributing the most to the overall browning of the northern high latitudes (>50°N) since 2011. The spring-ward shift of peak season plant activity is expected to disrupt the synchrony of biotic interaction and exert strong biophysical feedbacks on climate by modifying the surface albedo and energy budget. © 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/110417
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: Department of Geography and Planning, University of Toronto, Toronto, ON, Canada
Recommended Citation:
Gonsamo A.,Chen J.M.,Ooi Y.W.. Peak season plant activity shift towards spring is reflected by increasing carbon uptake by extratropical ecosystems[J]. Global Change Biology,2018-01-01,24(5)