Almost every kind of species of Living things, during the long history of evolution, have got evolved together with other species on which they had fed, for example Natural enemies or microorganism. When they entered a new ecological surroundings, the first thing necessary for them to do is occupy a large expanse of space, such as lakes,land,and breed themselves fast like mushroom growth, without restraint of their enemies. But Original Inhabitants will have to get withered even extinct—That’s called Living Things Inroad. At present, much external species of invaders has been infiltrating into our country.
Harmful Embodiment of Inroad by Living Things
The harm by Living Things shall be embodied as following three aspects: destroy ecology, endanger human health, and hamper economic development.
Large crowds of external invasion will unavoidably result in irreversible destroy to ecology, as humankind seems to be unable to check the quick spread of breeding and serious pollution, which may be also called ecological disaster, doing great harm to agricultural production, undermining national economy.
The invasion by external species destroy ecosystem by antagonizing toward native species for nutrients, water, existence, thus is bound to lead to heavy exhaustion of natural resources. Some invaders do direct harm to human body, so a series of safety problems on politics, economy, society and culture ensued.
China, with large varieties of native living things, complicated geographical situation, is one of the most invasion-stricken victims in the world. Even now, many countries haven’t achieved an effective way to control it, sill less China. It is calculated that yearly economic loss suffered from several external species to be fifty-five billion and four hundred million Yuan.
The Main ways for Inroad
The ways that external species make inroad are as following three: intentional introduction, unintentional introduction, natural diffusing.
Intentional introduction: blind introduction of external species into our country for agricultural production, maintaining ecosystem, as well as scenery construction without evaluating their risk, is a major way.
Unintentional introduction: with the rapid progress of globalized economy, trade, tourism, international communication is getting more and more frequent, which is prone to letting in external species.
Natural diffusing: Some certain kinds of plant species can easily born by natural carriers, such as wind, water or animals.