Abstract:

Huanghuai Plain is the main wheat production area of China, and this area is one of the places where frost happens seriously. Frost makes the wheat yield reduce, impacts on food security issues. Studying the temporal and spatial distribution of frost injury in Huanghuai Plain provided scientific basis for decision for the cultivation of wheat. This paper selected the lowest temperature after the jointing stage and the number of days from jointing stage as the indices in order to construct the frost injury disaster function. Using this function got the frost injury disaster value of various regions of winter wheat. According to the value of the frost disaster classified the grades of frost. Using the value calculated the frequency of frost injury at all levels. Using GIS got the characters of spatial and temporal distribution of frost injury. The results showed that at all levels, frequency of occurrence of frost injury tended to decrease with the years, and the mild frost happened frequently. The frequency of mild frost was about 15% at all years. The frequency of the severe frost was about 6% fewer than the mild frost. The frequency of the moderate frost was the fewest. Henan Province and Shandong Province were the areas where frost occurred frequently and seriously. The frequencies of these areas were more than 30%, and the most were 70%. Overall, the frequency of northern part was more than the south. The analysis of wheat frost injury on temporal and spatial distribution provided a theoretical basis of disaster prevention and reduction of winter wheat and the selection of winter wheat varieties.