摘要
本文研究了水稻白叶枯病病丛,病株和病叶的空间格局及其田间抽样技术.结果表明,病株和病叶在田间的分布均呈聚集格局,其中前者属于一般的负二项分布,后者属于具有共通k值的负二项分布;病丛的分布在所测密度范围内(2.7176-5.9041病丛/样方,即病丛率为45.29%～98.40%) 呈均匀格局;田间抽样效果以Z字形取样法最佳,而目前测报上在本田期所采用的3点取样法最差;取样54丛的调查效果也较常用的27丛显著为优.据此,作者建议,大田调查时最好采用Z字形抽样法取样54丛,以提高调查测报准确性.
On the basis of the five aggrcgation indices, Taylor's power law a-nd Iwao's M～X regression analysis, the spatial pattern of affected plants andthe diseased leaves of Rice Bacterial Leaf Blight were all in aggregative patterns,the former accorded with the general negative binomial distribution and the laterfit the negative binomial distribution with the common value of k, and the dist-ribution pattern of the diseased clumps was of regular pattern in the tested den-sity range (2.7176 to 5.9041 clumps per guadrat sampling i. e. the percentage ofthe diseased clumps was between 45.29%and 98.40%). Based on the informationof the patterns, the field sampling techniques were studied、The results showedthat the Z-shape sampling method was the best of all simple methods, and thethree point sampling method commonly used in disease prediction seemed to beunsuitable. The effect of 54 guadrats per field on sampling was better than thatof 27 guadrats. According to this reason, we suggest that 54 guadrats would bestbe taken by the method of Z-shape sampling in the field stage for increasing theaccuracy of investigation and prediction.
出处
《安徽农业科学》
CAS
1991年第3期259-264,共6页
Journal of Anhui Agricultural Sciences
关键词
水稻
白叶枯病
空间分布
抽样
Rice Bacterial Leaf Blight
Spatial pattern
Sampling technique
