Abstract:
Using annual extreme minimum temperature(winter), ecadal extreme minimum temperature from mid-April to mid-May(spring flowering period)of 13 national meteorological stations in Yan'an City from 1991 to 2020, and annual extreme minimum temperature from 109 meteorological observation stations from 2008 to 2020, as well as extreme minimum temperature observation data from mid-April to mid-May from 2013 to 2020, using linear regression method, data correction and spatial interpolation were performed, and GIS technology was used to draw a risk zoning map for low temperature freezing damage during cherry winter and spring flowering periods.Results showed that, obtaining temperature data from weather observation station for 30 years was possible, and there was a strong correlation between temperature observation data from national meteorological stations and regional stations.Temperature was jointly influenced by altitude, longitude and latitude, and multiple linear regression equation established could pass confidence test of 0.001.Calculated temperature distribution showed characteristics of low valley and high mountain top in gully region.Zoning results showed that Yanchang County, Yichuan County, Huanglong County, Luochuan County, Huangling County, as well as central and eastern parts of Yanchuan County and Baota District, were low risk areas for cherry low-temperature freezing damage; Ganquan County, Fuxian County, as well as western part of Baota District, central and western part of Yanchuan County, southern part of Zichang City, and southern part of Ansai District, were medium risk areas for cherry low-temperature freezing damage; Wuqi County, Zhidan County, as well as northern part of Ansai District and Zichang City, were high-risk areas for low temperature and freezing damage.