甘肃河东地区小麦条锈病菌(Pucciniastriiformis f.sp.tritici)越夏气候区划

Climatic zoning of Puccinia striiformis f.sp.tritici over-summering in Hedong area of Gansu Province

为明确气候变化等环境条件对小麦条锈病菌越夏区域和海拔高度的影响,采用修订的小麦条锈病菌越夏气象指标,即夏季最热8 d平均气温为主导指标、期间大气相对湿度为辅助指标,利用地理信息系统(GIS),进行甘肃河东小麦条锈病菌越夏气候区划研究。结果表明,甘肃河东地区小麦条锈病菌可越夏范围向西向北有所扩展、海拔高度下限有所下降。陇中北部、陇中南部、陇东高原、六盘山区、陇南北部、陇南南部可越夏海拔高度下限分别为1700、1400、1200、1200、1100 m和2000 m,与二十世纪80年代相比,分别下降了600、200、200、200、500 m和500 m,区域范围向西向北扩展到了陇中北部和甘南州等地。可越夏区以上涉及国土面积达到了近790多万公顷(hm2),占区域总面积的79%。

In order to clarify the impact of climate change and other environmental conditions on the Puccinia striiformis f.sp.tritici over-summering area and altitude,according to the revised over-summering meteorological index of Puccinia striiformis f.sp.tritici,that is,the average temperature of the hottest 8 days in the summer as the leading indicator and the relative humidity of the same period as the auxiliary index,geographical information system(GIS)was used to carry out Puccinia striiformis f.sp.tritici over-summering climatic zoning in Hedong of Gansu Province.The results showed that the range of Puccinia striiformis f.sp.tritici that passed through the summer in Hedong of Gansu had extended to the west and north,and the lower limit of altitude decreased.The lower limits of altitude that Puccinia striiformis f.sp.tritici passed through the summer in the north Longzhong,south Longzhong,Longdong Plateau,Liupan Mountain,north Longnan,and south Longnan were 1700,1400,1200,1200,1100,and 2000 meters,respectively.Compared with the 1980s,they had decreased by 600,200,200,200,500,and 500 meters,respectively,and the area had extended west and north to the northern Longzhong and Gannan Prefecture.The area that Puccinia striiformis f.sp.tritici passed through the summer reached nearly 7.9 million hectares(hm2),accounting for 79%of the total area.