GSTDTAP  > 气候变化
DOI10.1111/gcb.14001
Peak season plant activity shift towards spring is reflected by increasing carbon uptake by extratropical ecosystems
Gonsamo, Alemu; Chen, Jing M.; Ooi, Ying W.
2018-05-01
发表期刊GLOBAL CHANGE BIOLOGY
ISSN1354-1013
EISSN1365-2486
出版年2018
卷号24期号:5页码:2117-2128
文章类型Article
语种英语
国家Canada
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 C-13 isotope measurements at Point Barrow (Alaska, USA, 71 degrees N) to study the dynamics of the peak of season (POS) of plant activity. Averaged across extratropical (>23 degrees N) non-evergreen-dominated pixels, NDVI data show that the POS has advanced by 1.2 +/- 0.6days per decade in response to the spring-ward shifts of the start (1.0 +/- 0.8days per decade) and end (1.5 +/- 1.0days per decade) of peak activity, and the earlier onset of the start of growing season (1.4 +/- 0.8days 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 C-13 data, is advancing by 2.5 +/- 2.6 and 4.3 +/- 2.9days 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 degrees 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.


英文关键词carbon uptake CMIP5 CO2 seasonality earth system model peak season plant phenology Point Barrow station C-13
领域气候变化 ; 资源环境
收录类别SCI-E
WOS记录号WOS:000428879800023
WOS关键词LEAF CHLOROPHYLL CONTENT ; GROWING-SEASON ; CLIMATE-CHANGE ; ATMOSPHERIC CO2 ; PHENOLOGY ; FEEDBACKS ; RESPONSES ; LATITUDES ; EXCHANGE ; CMIP5
WOS类目Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS研究方向Biodiversity & Conservation ; Environmental Sciences & Ecology
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/17172
专题气候变化
资源环境科学
作者单位Univ Toronto, Dept Geog & Planning, Toronto, ON, Canada
推荐引用方式
GB/T 7714
Gonsamo, Alemu,Chen, Jing M.,Ooi, Ying W.. Peak season plant activity shift towards spring is reflected by increasing carbon uptake by extratropical ecosystems[J]. GLOBAL CHANGE BIOLOGY,2018,24(5):2117-2128.
APA Gonsamo, Alemu,Chen, Jing M.,&Ooi, Ying W..(2018).Peak season plant activity shift towards spring is reflected by increasing carbon uptake by extratropical ecosystems.GLOBAL CHANGE BIOLOGY,24(5),2117-2128.
MLA Gonsamo, Alemu,et al."Peak season plant activity shift towards spring is reflected by increasing carbon uptake by extratropical ecosystems".GLOBAL CHANGE BIOLOGY 24.5(2018):2117-2128.
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