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| Analysis on hazard risk of late frost for wine grape in the east foot area of Helan Mountain in Ningxia |
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| DOI：10.16768/j.issn.1004-874X.2018.05.021 |
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| Abstract: |
| Based on the April-May daily minimum temperature data with nine weather stations in the east foot
area of Helan Mountain in Ningxia during 1961—2015. The number of days ，frequency changes and hazard risk of
late frost for wine grape are researched from the perspective of climate disaster，that using mathematical statistics and
GIS spatial analysis.The results show that the days of late frost are between 78—233d in recent 55 years. The number
of light frost is significantly more than that of medium frost and heavy frost，the change in time shows a decreasing
trend. The rate of decline is greater than that of medium frost and heavy frost.The frost frequency showed the rule of
decreasing radiation from north to south except for Dawukou in the north . The place where frost frequency of each grade is greatest in Taole，least in Dawukou，the trend declined with the change of years. The frost frequency in the
other stations showed two or three jumps in the descending process in addition to the continued decline of Huinong.
The hazard risk of each station is mostly moderate to low level and getting smaller，the medium and low range is
obviously increasing with climate change. As of 2015，the areas of high-risk have largely disappeared，and the areas
of secondary and medium risk have also been greatly reduced. |
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