关键词: 稻瘟病, 空间分析, 发生区域, 反距离权重插值

Abstract: Heilongjiang Province is an important rice-growing area in northern China. Rice blast is one of the major diseases affecting rice production. According to the rules of investigation and forecast of the rice blast, this paper analyzed the key occurrence counties and core occurrence areas of rice blast, and extracted key rural monitoring points of rice blast in Heilongjiang Province based on the survey data of the rice blast disease rural monitoring point during the past 5 years in Heilongjiang Province using spatial analysis. The results showed that in the past 5 years the incidence area of rice blast in Heilongjiang Province accounted for 7.3 % of the surveyed area, the onset grade was mainly level 1 and overall occurrence was lighter. The occurrence areas of rice blast were mainly distributed in Acheng, Shangzhi, Fangzheng, Yanshou, Tonghe, Yilan of Harbin City in the upper reaches of the Songhua River, the area of Fujin and Tongjiang in Jiamusi City in the lower reaches of Songhua River, the area of Zhaoyuan County of Daqing City, Nehe of Qiqihar City in Nenjiang River Basin and Beilin District of Suihua City in Hulan River basin. This paper selected several key monitoring points, including 98 leaf blast and 47 spike neck blast key monitoring points. These results provided important basis for distribution optimization of rice blast monitoring area and monitoring points in Heilongjiang Province, and also provided important support for monitoring, prevention and control of rice blast.

Key words: rice blast, spatial analysis, occurrence area, inverse distance weighted（IDW）interpolation