Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/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
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ISSN | 1354-1013 |
EISSN | 1365-2486 |
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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