人类与自然生物控制共生理论在景观规划设计中的应用

本文在论述了景观生态学理论的产生、发展之后，本着持续发展的观点，依据生物控制共生理论，对沙化地区的土地进行了景观生态设计，具有一定的理论意义和应用价值。

人类与自然界的生物控制共生

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景观生态学的发展及其前景

本文探讨了景观生态学的概念,论述了世界各国该学科发展过程特别是近10年的迅速发展状况,介绍了有关景观生态学的理论成果与理论基础,最后作者指出景观生态学的前景应加强理论原理、研究方法与应用技术的研究。

大庆沙地景观生态建设

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Pathogenicity of bacterium, Xenorhabdus nematophila isolated from entomopathogenic nematode (Steinernema carpocapsae) and its secretion against Galleria mellonella larvae

The entomopathogenic bacterium, Xenorhabdus nematophila was isolated from the hemolymph of Galleria mel- lonella infected with Steinernema carpocapsae. The bacterial cells and its metabolic secretions have been found lethal to the Galleria larvae. Toxic secretion in broth caused 95% mortality within 4 d of application whereas the bacterial cells caused 93% mortality after 6 d. When filter and sand substrates were compared, the later one was observed as appropriate. Similarly, bacterial cells and secretion in broth were more effective at 14% moisture and 25 °C temperature treatments. Maximum insect mortality (100%) was observed when bacterial concentration of 4×106 cells/ml was used. Similarly, maximum bacterial cells in broth (95%) were penetrated into the insect body within 2 h of their application. However, when stored bacterial toxic secretion was applied to the insects its efficacy declined. On the other hand, when the same toxic secretion was dried and then dissolved either in broth or water was proved to be effective. The present study showed that the bacterium, X. nematophila or its toxic secretion can be used as an important component of integrated pest management against Galleria.