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经测定水稻细菌性条斑病株在稻田的空间格局属负二项分布(α=0.962,β=1.104),其公共Kc=2.2971;采用种群聚集均数(λ)测定,当稻田每丛病株数在2.327株以下时,其聚集原因可能是病菌从其它病田上侵入所致;当病株数≥2.372株时,其聚集原因可能是种子带菌,增加再次侵染的机会,使聚集均数(λ)增大所致。由于属聚集分布,用Iwao资料代换法求取每田块水稻细菌性条斑病的相应Y值。采用Southwood的K。法理论抽样模式,作者建议大田普查,一般轻病田可抽取50—100丛稻;中、重病田可抽取10—50丛.
The spatial distribution of rice bacterial leaf streak isolates in paddy field was negative binomial distribution (α = 0.962, β = 1.104), and the public Kc was 2.2971. The population aggregation mean (λ) When the number of strains is less than 2.327, the reason may be that the bacteria invaded other disease fields. When the number of diseased plants was more than 2.372, the reason for its aggregation may be seed carrying, which increases the opportunity of re-infection, ) Increase due to. Due to the aggregation distribution, the corresponding Y value of rice bacterial leaf streak in each field was calculated by Iwao data substitution method. Using Southwood’s K. Law theory sampling model, the author recommends a census of the field, the general mild disease can be extracted 50-100 rice; moderate and severe disease can extract 10-50 plexus.