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Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (36): 57-68.doi: 10.11924/j.issn.1000-6850.casb2023-0042

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Study on the Impact of High-Temperature Heat Stress on Red-fleshed Kiwifruit: A Case Study of the Sichuan Basin in 2022

WANG Qin1(), ZHAO Zhou2, ZHANG Xinyu1, ZENG Juan1, ZHANG Le1, QIAO Rong2, HOU Chunxia3   

  1. 1 Guangyuan Meteorological Bureau, Guangyuan, Sichuan 628017
    2 Cangxi County Meteorological Bureau, Cangxi, Sichuan 628400
    3 Guangyuan Bureau of Agriculture and Rural Affairs, Guangyuan, Sichuan 628017
  • Received:2023-01-11 Revised:2023-10-11 Online:2023-12-20 Published:2023-12-20

Abstract:

In order to study the effects of high-temperature heat stress on red-fleshed kiwifruit, the high-temperature heat stress index for red-fleshed kiwifruit was employed. Taking the high-temperature heat stress in the Sichuan basin in 2022 as an example, quantitative evaluations were conducted on the impact of high-temperature heat stress on yield and quality of red-fleshed kiwifruit using agricultural meteorological observation records, quality test data, and surveys on high-temperature heat stress in red-fleshed kiwifruit orchards. The results showed that the high-temperature heat stress on red-fleshed kiwifruit in the Sichuan basin in 2022 was the most severe since 1978, with the average intensity index, coverage rate, and comprehensive impact assessment index all breaking previous records. Extreme high-temperature heat stress had a significant impact on yield and quality of red-fleshed kiwifruit. The average individual fruit weight decreased by 19%-46% compared to the previous year, coloration deteriorated by 1-2 grades, sugar content increased by 15%-50%, and soluble solids showed little change, within ±3.2%. Titratable acidity increased by 15.6%, vitamin C content increased by 13.6%-86.2%, and tannin content decreased by 9.8%-61.5% compared to the previous year. Changes in sugar-to-acid ratio and tannin content deviated from normal, resulting in a less appealing or peculiar taste. The impact of high-temperature heat stress was positively correlated with its intensity, indicating that a stronger heat stress led to a greater impact. Furthermore, there was an inverse correlation between high-temperature heat stress and disaster prevention and mitigation capabilities. For red-fleshed kiwifruit orchards, issuing early warnings for high-temperature heat stress and implementing measures such as shade netting, ground cover, and appropriate irrigation can effectively alleviate the adverse effects of high-temperature heat stress.

Key words: red-fleshed kiwifruit, high-temperature heat stress, quantitative evaluation, Sichuan basin, warning indicators