Articles
OBSERVED MONTHLY TEMPERATURE AND PRECIPITATION TRENDS IN THE MAJOR GRAPE-PRODUCING REGIONS IN CHINA
Article number
931_8
Pages
79 – 86
Language
English
Abstract
Monthly temperature and precipitation trends from 10 agricultural meteorological stations in China were analyzed over the years 1984-2008. Five major grape-producing provinces in China (Hebei, Liaoning, Shandong, Henan and Xinjiang) were chosen in this study.
The results showed that warming trends were observed at all major grape growing regions.
The trends of maximum (tmax), mean (tmean) and minimum (tmin) temperatures were markedly increased in Shandong (r2=0.705**), Xinjiang (r2=0.608**) and Hebei (r2=0.839**), respectively.
In addition, monthly temperature trends were strongest in March and December which showed highest trends in Liaoning and Xinjiang (0.35 and 0.57°C/decade). Whereas precipitation (ppt) trends had remained stable in most of the grape growing regions and it had slightly increasing trends in Shandong (r2=0.142), while monthly ppt had more frequent droughts in summer and early autumn (June-September), particularly in Henan, Liaoning, and Xinjiang (-10.85, -5.56 and -3.99 mm/decade). For the climatic variable and yield variation (t/ha/y) in spring-summer (March-August) period, yield variations of all regions were not profoundly influenced by warming trends but they were significantly correlated with ppt trends.
Therefore, it suggests that recent climate trends have had an implicit effect on grape yields in the major grape-producing regions in China.
The results showed that warming trends were observed at all major grape growing regions.
The trends of maximum (tmax), mean (tmean) and minimum (tmin) temperatures were markedly increased in Shandong (r2=0.705**), Xinjiang (r2=0.608**) and Hebei (r2=0.839**), respectively.
In addition, monthly temperature trends were strongest in March and December which showed highest trends in Liaoning and Xinjiang (0.35 and 0.57°C/decade). Whereas precipitation (ppt) trends had remained stable in most of the grape growing regions and it had slightly increasing trends in Shandong (r2=0.142), while monthly ppt had more frequent droughts in summer and early autumn (June-September), particularly in Henan, Liaoning, and Xinjiang (-10.85, -5.56 and -3.99 mm/decade). For the climatic variable and yield variation (t/ha/y) in spring-summer (March-August) period, yield variations of all regions were not profoundly influenced by warming trends but they were significantly correlated with ppt trends.
Therefore, it suggests that recent climate trends have had an implicit effect on grape yields in the major grape-producing regions in China.
Authors
R. Chiarawipa, T. Wu, Z.H. Han
Keywords
climate change, high temperature, rainfall, growing season, yield variation
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