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An introduced species, alien species, exotic species, foreign species, non-indigenous species, or non-native species is a species living outside its native distributional range, but which has arrived there by human activity, either deliberate or accidental. Non-native species can have various effects on the local ecosystem. Introduced species that become established and spread beyond the place of introduction are called invasive species. The process of human-caused introduction is distinguished from biological colonization, in which species spread to new areas through "natural" (non-human) means such as storms and rafting.
Ecological restoration method for in-situ resource utilization of polluted pond sediment of sandy coast
The present application relates to an ecological restoration method for in-situ resource utilization of contaminated pond sediment of sandy coast, and belongs to the technical field of ecological restoration and solid waste resource utilization. The method comprises the following steps: evaluating the pollution condition of the sandy sediment at the bottom of the eutrophic pond of the sandy coast; under the condition that the water pollutants exceed the standard but the greening planting soil does not exceed the standard, using the dry dredging and temporary storage method, transporting the sandy sediment to the greening planting area in the project area after excavation, and using the pretreated sandy sediment as the greening planting soil of the local sand vegetation. The present application avoids the secondary pollution caused by the external transportation of the sandy sediment, the restriction of the sand mining policy and the pollution disposal problem, reduces the cost, fully utilizes the nutrient elements in the sandy sediment to provide nutrition for the vegetation, plants the local sand vegetation, maximizes the survival rate of the vegetation, avoids the introduction of alien species to cause damage to the local ecology, and realizes the resource utilization and harmless utilization of the sandy contaminated sediment.
Owner:TIANJIN RES INST FOR WATER TRANSPORT ENG M O T