气候变化领域集成服务门户(CCPortal): Increased heat requirement for leaf flushing in temperate woody species over 1980-2012: effects of chilling, precipitation and insolation

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DOI	10.1111/gcb.12863
	Increased heat requirement for leaf flushing in temperate woody species over 1980-2012: effects of chilling, precipitation and insolation
	Fu, Yongshuo H.; Piao, Shilong; Vitasse, Yann; Zhao, Hongfang; De Boeck, Hans J.; Liu, Qiang; Yang, Hui; Weber, Ulrich; Hanninen, Heikki; Janssens, Ivan A.
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	2687
结束页码	2697
卷号	21 期号:7
英文摘要	Recent studies have revealed large unexplained variation in heat requirement-based phenology models, resulting in large uncertainty when predicting ecosystem carbon and water balance responses to climate variability. Improving our understanding of the heat requirement for spring phenology is thus urgently needed. In this study, we estimated the species-specific heat requirement for leaf flushing of 13 temperate woody species using long-term phenological observations from Europe and North America. The species were defined as early and late flushing species according to the mean date of leaf flushing across all sites. Partial correlation analyses were applied to determine the temporal correlations between heat requirement and chilling accumulation, precipitation and insolation sum during dormancy. We found that the heat requirement for leaf flushing increased by almost 50% over the study period 1980-2012, with an average of 30 heat units per decade. This temporal increase in heat requirement was observed in all species, but was much larger for late than for early flushing species. Consistent with previous studies, we found that the heat requirement negatively correlates with chilling accumulation. Interestingly, after removing the variation induced by chilling accumulation, a predominantly positive partial correlation exists between heat requirement and precipitation sum, and a predominantly negative correlation between heat requirement and insolation sum. This suggests that besides the well-known effect of chilling, the heat requirement for leaf flushing is also influenced by precipitation and insolation sum during dormancy. However, we hypothesize that the observed precipitation and insolation effects might be artefacts attributable to the inappropriate use of air temperature in the heat requirement quantification. Rather than air temperature, meristem temperature is probably the prominent driver of the leaf flushing process, but these data are not available. Further experimental research is thus needed to verify whether insolation and precipitation sums directly affect the heat requirement for leaf flushing.
关键词	CLIMATE-CHANGE IMPACTS TERRESTRIAL BIOSPHERE MODEL SPRUCE PICEA-ABIES BUD BURST PHENOLOGICAL MODELS DORMANCY RELEASE FAGUS-SYLVATICA TREE PHENOLOGY THERMAL TIME VEGETATION
英文关键词	chilling requirement; climate change; heat requirement; insolation; leaf flushing phenology; precipitation
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:000356422500020
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/258600
推荐引用方式 GB/T 7714	Fu, Yongshuo H.,Piao, Shilong,Vitasse, Yann,et al. Increased heat requirement for leaf flushing in temperate woody species over 1980-2012: effects of chilling, precipitation and insolation[J]. 中国科学院青藏高原研究所,2015,21(7).
APA	Fu, Yongshuo H..,Piao, Shilong.,Vitasse, Yann.,Zhao, Hongfang.,De Boeck, Hans J..,...&Janssens, Ivan A..(2015).Increased heat requirement for leaf flushing in temperate woody species over 1980-2012: effects of chilling, precipitation and insolation.GLOBAL CHANGE BIOLOGY,21(7).
MLA	Fu, Yongshuo H.,et al."Increased heat requirement for leaf flushing in temperate woody species over 1980-2012: effects of chilling, precipitation and insolation".GLOBAL CHANGE BIOLOGY 21.7(2015).