Biological disasters are natural disasters, in addition to the common features of general natural disasters, but also have the characteristics of periodicity, suddenness, diffusion, controllability and so on.
Sudden many harmful organisms have short life cycles and high reproduction rates, which can cause harm to large numbers of groups in a very short period of time.
Hidden many harmful biological forms are variable, and monitoring and control are difficult. Pest insect stoics generally go through different insect states such as eggs, larvae, larvae and adult insects: pathogenic microorganisms are small and hidden. There are also many pests hidden in the body, water, atmosphere or underground, not easy to detect, and difficult to control.
The vast majority of diffuse pests can migrate to another place with air currents, currents, animal migration, man-made activities and their own relocations, which can cause harm to ecosystems when settled in new territories. Some dangerous pests invade new areas and multiply rapidly, crowding out native organisms and causing ecological disasters.
The distribution of regional pests has obvious regional characteristics. In addition, the life and harmful behaviors of pests are closely related to natural factors. The life cycle of disasters and the cycle and degree of disasters have a strong regionality.
Socially, from the perspective of disaster sources, biological disasters are relative and caused by imbalances in ecosystems. Due to the overexploitation and utilization of resources by human beings, the original orderly state of the ecosystem has been broken, resulting in a decline in the ability of the ecosystem to resist stress. When ecological factors that are beneficial to a certain organism exist (such as climate warming, pure forests, and wide areas) The use of pesticides, etc.), the organism may endanger the ecological safety and form a disaster: due to environmental pollution, fire, flood, freezing and other natural disasters, the main organisms in the ecosystem are weakened, so that a few resistant organisms seize the cology. The occurrence of biological disasters: Due to the frequent long-distance activities of human beings, the geographical restrictions have been broken, and some alien creatures have invaded with human activities, endangering ecological health.
Biological disasters not only cause huge economic losses, but also cause great harm to the ecology, but also endanger human health. Such as avian influenza, AIDS, renal syndrome Hemorrhagic fever, SARS, Ebola and other malignant infectious diseases, a serious threat to human health, endangering public health safety.
Time pests are also a part of the ecosystem, the evolution of ecosystem depends on natural conditions, the occurrence of biological disasters is closely related to natural conditions to a large extent, in its occurrence and development, showing a strong time.
The predictable and controlable pests have certain biological and ecological characteristics, and all have certain laws of development, and through long-term monitoring and study of their biological and ecological characteristics, it is possible to establish prediction models and make disaster prediction. According to the ecological and biological characteristics of harmful organisms, it is possible to interfere with harmful pests and reduce the loss of biological disasters to within the economic threshold. Harmful organisms generally have natural enemies, can use natural enemies to carry out biological control, or through ecological measures to improve the ecological environment, create a conducive to natural enemies and not conducive to harmful organisms living environment, to achieve sustainable governance.
The arduous nature of governance has a wide variety of biological disaster sources, including pathogenic microorganisms such as bacteria, fungi, and viruses, pests, grasses, and rodents. Biohazard suffers from a wide variety of species and covers a large area, involving the entire global ecosystem. In addition, the form of harmful organisms is changeable, concealed, and the scope of treatment is wide and difficult.
Because of the different sources of disasters and disasters, different biological disasters have their own unique characteristics.
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