| 摘要: |
| 稻瘟病的叶瘟病株、病斑和穗颈瘟白穗的空间分布型都是聚集的。Taylor幂法则和 Jwao 集聚格局分析比其它扩散型指标,更能够说明病害的生态特征。稻瘟病叶瘟的病丛率(x)与病株率(y)的关系为 y=0.5632e0.0451x,穗颈瘟白穗丛率(x)和白穗株率(y)的关系为 y=0.8957e0.03786x,都呈极显著相关,有利于调查方法的简化。负二项理论抽样,将原公式简化,其抽样数可依 S2=aχb代替 k 值作用,它随平均数而变化,计算较方便。 |
| 关键词: 稻瘟病,空间分布型,理论抽样 |
| DOI： |
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| STUDIES ON SPATIAL DISTRIBUTION PATTERNS AND SAMPLING OF LEAF AND NECK BLAST OF RICE |
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Mu Yongshun Li Gang,Mu Yongshun Li Gang
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| Abstract: |
| The spatial distribution of plants,lesions,bleached and sterile heads,infected by Piricularia oryzae,are of aggregation pattern.The relations between the percentage of infected hole plants(x)and of infected plants(y)may be expressed by y=0.5632e0.0451x.The relations between the percentage of infected plants(x)and of infected leaves(y)can be described by y=4.0278e0.0280x, and between the percentage of infected leaves(x)and disease index(y)by y=0.2152e1.2198x).Tayler's method and Iwao's m-m regression analysis are Vary convenient to test the spatial distribution pattern of plant disease. |
| Key words: blast of rice,spatial distribution patterns,sampling |
