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Volume 110, Issue 3 p. 961-969
Crop Economics, Production, and Management

High-Temperature Episodes with Spatial-Temporal Variation Impacted Middle-Season Rice Yield in China

Xinsu Sun

Xinsu Sun

Jiangsu Collaborative Innovation Center for Modern Crop Production, Nanjing, 210095 China

Institute of Applied Ecology, Nanjing Agricultural Univ., Nanjing, 210095 China

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Zhiwei Long

Zhiwei Long

Institute of Applied Ecology, Nanjing Agricultural Univ., Nanjing, 210095 China

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Guangpeng Song

Guangpeng Song

Institute of Applied Ecology, Nanjing Agricultural Univ., Nanjing, 210095 China

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Changqing Chen

Corresponding Author

Changqing Chen

Jiangsu Collaborative Innovation Center for Modern Crop Production, Nanjing, 210095 China

Institute of Applied Ecology, Nanjing Agricultural Univ., Nanjing, 210095 China

Corresponding author ([email protected]).Search for more papers by this author
First published: 01 May 2018
Citations: 7

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Abstract

Core Ideas

  • Quantified high-temperature intensity, frequency, and duration as HDH index.
  • High-temperature episodes between booting and flowering increased significantly.
  • High-temperature episodes had a significant negative effect on rice yield.

Booting and flowering stages of rice are most sensitive to high-temperature episodes. However, the effect of spatial-temporal characteristics of high-temperature episodes on booting and flowering stages in the middle-season rice cropping region of China were less commonly found in the literature. A data analysis of historical climate and rice yield was conducted to characterize the spatial and temporal variability of high-temperature episodes between booting and flowering stages and their impact on middle-season rice grain yield in China. Three high-temperature indices, including high-temperature hours (HH), high-temperature intensity (HI), and high-temperature degree hours (HDH), were developed to quantify the high-temperature intensity, frequency, and duration based on maximum temperature records of the last 30 yr from 219 stations in the main middle-season rice cropping area of China. The HH and HI indices between booting and flowering stages increased significantly in all subregions. Especially in the Central China (CC) subregion, high-temperature episodes were more severe than those in the East China (EC) subregion and Southwest (SW) subregion. The HDH index, considering the duration and intensity of high-temperature episodes, was required to describe the correlation between high-temperature episodes and yield variability. Significant negative (p < 0.05) impacts of the variability of high-temperature episodes on the observed grain yield were found in all subregions. Rice yield would decrease by 113.9 kg ha−1, 19.1 kg ha−1, and 22.2 kg ha−1 with an HDH increase of 1.0°C·d in the EC, CC, and SW subregions, respectively. High-temperature episodes were detrimental to middle-season rice production of China.