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DOI	10.1111/gcb.12724
	Seasonally different response of photosynthetic activity to daytime and night-time warming in the Northern Hemisphere
	Tan, Jianguang; Piao, Shilong; Chen, Anping; Zeng, Zhenzhong; Ciais, Philippe; Janssens, Ivan A.; Mao, Jiafu; Myneni, Ranga B.; Peng, Shushi; Penuelas, Josep; Shi, Xiaoying; Vicca, Sara
通讯作者	Piao, SL (通讯作者)
发表日期	2015
ISSN	1354-1013
EISSN	1365-2486
起始页码	377
结束页码	387
卷号	21 期号:1
英文摘要	Over the last century the Northern Hemisphere has experienced rapid climate warming, but this warming has not been evenly distributed seasonally, as well as diurnally. The implications of such seasonal and diurnal heterogeneous warming on regional and global vegetation photosynthetic activity, however, are still poorly understood. Here, we investigated for different seasons how photosynthetic activity of vegetation correlates with changes in seasonal daytime and night-time temperature across the Northern Hemisphere (>30 degrees N), using Normalized Difference Vegetation Index (NDVI) data from 1982 to 2011 obtained from the Advanced Very High Resolution Radiometer (AVHRR). Our analysis revealed some striking seasonal differences in the response of NDVI to changes in day- vs. night-time temperatures. For instance, while higher daytime temperature (T-max) is generally associated with higher NDVI values across the boreal zone, the area exhibiting a statistically significant positive correlation between T-max and NDVI is much larger in spring (41% of area in boreal zone - total area 12.6x10(6)km(2)) than in summer and autumn (14% and 9%, respectively). In contrast to the predominantly positive response of boreal ecosystems to changes in T-max, increases in T-max tended to negatively influence vegetation growth in temperate dry regions, particularly during summer. Changes in night-time temperature (T-min) correlated negatively with autumnal NDVI in most of the Northern Hemisphere, but had a positive effect on spring and summer NDVI in most temperate regions (e.g., Central North America and Central Asia). Such divergent covariance between the photosynthetic activity of Northern Hemispheric vegetation and day- and night-time temperature changes among different seasons and climate zones suggests a changing dominance of ecophysiological processes across time and space. Understanding the seasonally different responses of vegetation photosynthetic activity to diurnal temperature changes, which have not been captured by current land surface models, is important for improving the performance of next generation regional and global coupled vegetation-climate models.
关键词	TERRESTRIAL CARBON-CYCLE CLIMATE-CHANGE VEGETATION INDEX GLOBAL PRODUCTS DROUGHT TEMPERATURE ECOSYSTEMS FEEDBACKS NDVI CO2
英文关键词	daytime warming; night-time warming; photosynthesis; seasonal change; vegetation activity
语种	英语
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
WOS类目	Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS记录号	WOS:000346698100033
来源期刊	GLOBAL CHANGE BIOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258612
推荐引用方式 GB/T 7714	Tan, Jianguang,Piao, Shilong,Chen, Anping,et al. Seasonally different response of photosynthetic activity to daytime and night-time warming in the Northern Hemisphere[J]. 中国科学院青藏高原研究所,2015,21(1).
APA	Tan, Jianguang.,Piao, Shilong.,Chen, Anping.,Zeng, Zhenzhong.,Ciais, Philippe.,...&Vicca, Sara.(2015).Seasonally different response of photosynthetic activity to daytime and night-time warming in the Northern Hemisphere.GLOBAL CHANGE BIOLOGY,21(1).
MLA	Tan, Jianguang,et al."Seasonally different response of photosynthetic activity to daytime and night-time warming in the Northern Hemisphere".GLOBAL CHANGE BIOLOGY 21.1(2015).