Journal of Ecology and Rural Environment ›› 2016, Vol. 32 ›› Issue (2): 259-269.doi: 10.11934/j.issn.1673-4831.2016.02.014

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Impacts of Extreme High Temperature on Winter Wheat Yield in the Huang-Huai-Hai Plain

SHI Xiao-li1,2, SHI Wen-jiao3   

  1. 1. College of Resources and Environment Sciences, Hebei Normal University, Shijiazhuang 050024, China;
    2. Key Laboratory of Environmental Evolvement and Ecological Construction of Hebei Province, Shijiazhuang 050024, China;
    3. Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
  • Received:2015-04-08 Online:2016-03-25 Published:2016-04-01


So far little has been reported on impacts of extremely high temperature on yield of winter wheat. Currently a study was conducted in the Huang-Huai-Hai Plain, a major wheat producing region of the country, using the number of extremely hot days and the number of extreme growing degree days as indicators of extremely high temperature to explore spatio-temporal variation of extremely high temperature during the winter wheat growing seasons, with the climate tendency rate method. And a multi-factor linear regression model encompassing the number of normal growing degree days, the number of extreme growing degree days, precipitation, and winter wheat yield was established with the first difference method and used to analyze sensitivity of winter wheat in yield to extremely high temperature on the county, province and region scales and further to illustrate contribution of extremely high temperature to winter wheat yield during the 29 years from 1980 to 2008. Results show that during the 29 years, extremely high temperature displayed a rising trend and spatially from east to west a rising trend too, and the number of extreme growing degree days had a significantly negative effect on winter wheat yield, on all the three scales. Extremely high temperature during the winter growing season was found to have an obvious yield-reducing effect on winter wheat in the region north to the Huai River, specially in Tianjin and Henan Province, where the yield of winter wheat decreased by 4.15% and 1.49%, respectively. In the northern and southern parts of the Huang-Huai-Hai Plain, the increasing number of extreme growing degree days caused a drop of 0.72% and 0.65% in winter wheat yield during the period. Obviously extremely high temperature affects negatively growth and production of winter wheat in the region.

Key words: extremely high temperature, winter wheat yield, first difference method, the Huang-Huai-Hai Plain

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