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	Chilling and heat requirements for flowering in temperate fruit trees
	Guo L. ; Dai J. H. ; Ranjitkar S. ; Yu H. Y. ; Xu J. C. ; Luedeling E.
	2014
关键词	Chilling requirement Climate change Flowering Fruit trees Heat requirement Partial least squares regression global warming context climate-change spring phenology winter chill apricot cultivars dormancy breaking pistachio trees south-africa western cape field crops
英文摘要	Climate change has affected the rates of chilling and heat accumulation, which are vital for flowering and production, in temperate fruit trees, but few studies have been conducted in the cold-winter climates of East Asia. To evaluate tree responses to variation in chill and heat accumulation rates, partial least squares regression was used to correlate first flowering dates of chestnut (Castanea mollissima Blume) and jujube (Zizyphus jujube Mill.) in Beijing, China, with daily chill and heat accumulation between 1963 and 2008. The Dynamic Model and the Growing Degree Hour Model were used to convert daily records of minimum and maximum temperature into horticulturally meaningful metrics. Regression analyses identified the chilling and forcing periods for chestnut and jujube. The forcing periods started when half the chilling requirements were fulfilled. Over the past 50 years, heat accumulation during tree dormancy increased significantly, while chill accumulation remained relatively stable for both species. Heat accumulation was the main driver of bloom timing, with effects of variation in chill accumulation negligible in Beijing's cold-winter climate. It does not seem likely that reductions in chill will have a major effect on the studied species in Beijing in the near future. Such problems are much more likely for trees grown in locations that are substantially warmer than their native habitats, such as temperate species in the subtropics and tropics.
出处	International Journal of Biometeorology
卷	58
期	6
页	1195-1206
收录类别	SCI
语种	英语
ISSN号	0020-7128
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/29860]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Guo L.,Dai J. H.,Ranjitkar S.,et al. Chilling and heat requirements for flowering in temperate fruit trees. 2014.

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