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作者应用回归最优设计,评价了水稻栽插密度与施氮水平对稻飞虱、稻纵卷叶螟和水稻纹枯病发生为害的综合生态效应。结果表明,密度与氮肥均是诱发稻飞虱、稻纵卷叶螟和水稻纹枯病发生为害的主要因子,但影响的侧重点不同,密度主要影响稻飞虱、稻纵卷叶螟迁入虫量的再分配;氮肥对稻飞虱、稻纵卷叶螟种群动态的影响,以及对水稻纹枯病的水平扩展作用要大于密度的作用;而密度对水稻纹枯病的垂直扩展作用略大于氮肥的作用,二者的交互效应对稻飞虱、稻纵卷叶螟种群动态以及对水稻纹枯病的水平扩展与垂直扩展均有显著的影响。并应用数学原理进一步分析,探讨了利于水稻生长发育而不利于病虫繁殖流行的密度与氮肥的最佳组配方案。
The authors applied regression optimal design to evaluate the integrated ecological effects of planting density and nitrogen application rate on the occurrence of rice planthoppers, rice leaf roller and sheath blight in rice. The results showed that both density and nitrogen fertilizer were the main factors that induced planthoppers, rice leaf roller and sheath blight. However, the main points of influence were different. Density mainly affected planthoppers, The redistribution of the amount of insects, the effect of nitrogen fertilizer on the population dynamics of rice planthoppers and rice leaf roller, and the greater horizontal spread to rice sheath blight than that of density. However, the vertical spreading effect of density on rice sheath blight was slightly Is greater than that of nitrogen fertilizer. The interaction effects of both have significant effects on the population dynamics of rice planthopper and rice leaf roller, as well as the horizontal and vertical expansion of rice sheath blight. And the application of mathematical principles for further analysis of the development of rice conducive to the growth and development is not conducive to the prevalence of pests and diseases of the optimal density and nitrogen combination program.