基于互联网+数据挖掘的农业数据平台设计

随着农业数据规模日益增加,相应的、有针对性的数据挖掘平台设计成为迫切需要.该文设计了基于互联网+数据挖掘的农业数据平台,包括交互层、功能层、数据层3个层次.功能层是平台的核心,负责数据预处理、数据挖掘、挖掘结果展示等任务.针对Apriori算法进行了改进,通过频度集合、支持度集合、地址集合的联合使用,避免了重复扫描和频度冗余,进一步提升了挖掘算法的效率.以水稻生长中的二化螟虫害问题为研究对象,展开平台性能的验证性实验.实验结果表明:4种因素对二化螟爆发影响的强弱顺序为5月份降水最大,其次是5月份的温度,再次是2月份的温度,最后是2月份的降水.     

甘蔗条螟性外激素分泌腺研究

本文通过扫描电镜及光学显微镜观察了甘蔗条螟性外激素分泌腺的形态及组织的结构.甘蔗条螟性外激素腺十分发达,位于腹部第8—9节背面的节间膜上,是由该处节间膜部分细胞特化而成,属褶叠型腺体。外翻后,腺体的切面呈半球形.同时还观察描述了腺体各部份的形态结构.     

Do rice water weevils and rice stem borers compete when sharing a host plant？

The rice water weevil （RWW） Lissorhoptrus oryzophilus Kuschel （Coleoptera： Curculionidae） is an invasive insect pest office Oryza sativa L. in China. Little is known about the interactions of this weevil with indigenous herbivores. In the present study, adult feeding and population density of the weevil, injury level of striped stem borer Chilo suppressalis （Walker） （Lepidoptera： Pyralidae） and pink stem borer Sesamia inferens （Walker） （Lepidoptera： Noctuidae） to flee, as well as growth status of their host plants were surveyed in a rice field located in Southeastern Zhejiang, China, in 2004 with the objective to discover interspecific interactions on the flee. At tillefing stage, both adult feeding of the weevil and injury of the stem borers tended to occur on larger tillers （bearing 5 leaves） compared with small tillers （bearing 2-4 leaves）, but the insects showed no evident competition with each other. At booting stage, the stem borers caused more withering/dead hearts and the weevil reached a higher density on the plants which had more productive tillers and larger root system; the number of weevils per tiller correlated negatively with the percentage of withering/dead hearts of plants in a hill. These observations indicate that interspecific interactions exist between the rice water weevil and the rice stem borers with negative relations occurring at booting or earlier developmental stages of rice.