基于GIS的河套地区霜冻频率区划

Frequency Regionalization of Frost Based on GIS in Hetao Region

以巴彦淖尔市9站初、终霜日平均值为基数,将辖区9站和周边10站共19个站每年初、终霜日期与该基数比较,晚(早)5 d以上年份作为危害年进行统计,计算其出现频率,根据各站出现频率建立细网格推算方程,在GIS上实现区划。结果表明,河套地区终霜冻、初霜冻危害频率与该地区的经度、纬度和海拔高度均呈极显著的正相关,且分级图与实际情况相符。终霜冻危害频率大的区域为阴山南麓山脚下;危害频率小的区域为磴口县阴山以南的区域,杭锦后旗沙海、红旗一线以南以及临河丹达、八一乡一线以南的区域;中等危害区域为高发区和低发区中间交汇的区域。初霜冻危害频率大的区域为阴山南麓山脚下;危害频率小的区域为磴口、杭锦后旗阴山以南;中等危害区域为高发区和低发区中间交汇的区域。

Compared the average first /last frost date of 9 stations in Bayannaoer City with each year first /last frost date in 19 stations including 9 stations in Bayannaoer City and 10 stations surrounding,it was counted that late（early） a year for more than 5 days as the disadvantage years and the occurrence frequency was calculated.A fine-mesh grid equation was established and zoning was realized on GIS.The results showed that,the frequency of last / first frost in Hetao Region is positively correlated with longitude,latitude and altitude,the classification map is corresponding with actual situation.The more frequency of last frost region in at the foot of Nanlu Mountain;the less frequency regions are south of Yinshan in Dengkou County,Hangjin Shahai,south of Hongqi,Linhe Danda,south of Bayi;the moderate frost region is confluence area.The more,less and moderate first frost frequency regions are foot of Nanlu Mountain,Dengkou County and south of Hangjin Yinshan,confluence area,respectively.