Occurrence rules and risk zoning of dry-hot wind in winter wheat producing areas of north China

Based on the index of the occurrence of dryhot wind in winter wheat region, an index of its occurrence intensity was established and the occurrence rule of dry-hot wind was inverted for the main winter wheat producing areas in the North China Plain since 1961. According to the results, the winter wheat area of the middle and south of Hebei, the west and north of Shandong and the north of Henan are the high risk zones of dry-hot wind, and the occurrence has reduced since the beginning of 1980' s. Thus, using the winter wheat observatory meteorological data, production structure material, yield, growth phase and other data, a dry-hot wind risk assessment model was established after the construction of the dry-hot wind risk evaluation index system that cover the dry-hot wind strength risk index and integrated disaster resisting capability index of the winter wheat. The dry-hot risk in main winter wheat producing areas of north China was then assessed using the model, and the dry-hot wind risk zoning assessment map was made for the areas. Assessment results show that, southeast of Hebei and northwest of Shandong are areas with high risk of the dry-hot wind influence, while south of Henan, east of Shandong and Hebei are low risk areas.