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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Chilling and heat requirements for flowering in temperate fruit trees
International Journal of Biometeorology, Volume 58, No. 6, Year 2014
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Description
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. © 2013 ISB.
Authors & Co-Authors
Guo, Liang
China, Kunming
Kunming Institute of Botany
China, Beijing
University of Chinese Academy of Sciences
Dai, Junhu
China, Beijing
Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences
Ranjitkar, Sailesh
Kenya, Nairobi
World Agroforestry Centre
Yu, Haiying
Kenya, Nairobi
World Agroforestry Centre
Xu, Jianchu
China, Kunming
Kunming Institute of Botany
Kenya, Nairobi
World Agroforestry Centre
Luedeling, Eike
Kenya, Nairobi
World Agroforestry Centre
Statistics
Citations: 95
Authors: 6
Affiliations: 4
Identifiers
Doi:
10.1007/s00484-013-0714-3
ISSN:
00207128
Research Areas
Environmental