Method for recovering intertidal zone salt marsh wetland

Abstract

The invention discloses a method for recovering intertidal zone salt marsh wetland. The method includes the steps that a recovery area suitable for wetland recovery and wetland vegetation growth is selected in an intertidal zone; an ecological dam is constructed on the outer edge of the recovery area, and a culvert pipe for communicating the recovery area with the sea area is mounted; part of substrate is dug in the recovery area to form a shallow pond, and part of the substrate is lifted up to form a plant growth area suitable for growth of salt marsh plants; wetland plants are planted in the plant growth area, the culvert pipe is closed in the planting state and the seedling stage, a water pump is utilized to inject water in the shallow pond into wetland in the recovery area, water discharged out of the wetland flows and returns the shallow pond, the wetland and the shallow pond form internal water circulation, and the low water level is maintained; when wetland plants are mature, the culvert pipe is opened, sea tide flow is introduced, tidal water level change is formed, a proper flooding-drying alternating habitat is provided for the formed salt marsh vegetation, and the recovery area is made to gradually recover to the salt marsh wetland. According to the method, earthwork balance, water quantity regulation and other technical means are utilized, the degraded intertidal zone is recovered, and structural and functional stability of a wetland ecological system is improved.

Description

technical field [0001] The invention belongs to the field of marine environment protection and ecological engineering, and in particular relates to a restoration method of intertidal salt marsh wetland. Background technique [0002] Salt marsh is a tidal flat area where salt marsh plants grow between the coast and the open sea (intertidal zone). It is one of the most productive ecosystems in the world and has rich biodiversity. Ecological service function is the main contributor to the global "blue carbon sink". Salt marsh wetlands have important ecological functions such as protection of beaches, clean water quality, and carbon sinks. Moreover, salt marsh plants are the basic elements that promote material circulation and energy flow in wetland ecosystems. While maintaining individual survival, population stability, and community development, they also provide abundant food for other organisms in the wetland ecosystem and create a good habitat. [0003] However, wetland ...

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Problems solved by technology

For example, Patent Publication No. CN102763549A uses the control of surface water level to perform in-situ restoration of wetland vegetation; Patent Publication No. CN103314763A performs ecological restoration of plateau wetland vegetation through wetland terrain rectification and plant configuration; Buffer zone for ecological restoration of lakeside artificial wetlands; the wetland restoration projects carried out by the methods described in the above three patents have a long cycle and slow results, and only focus on the restoration and reconstruction of wetland vegetation while ignoring how to further improve wetland water quality, thus As a result, the constructed wetland ecosystem is not perfect and the ecological function of the wetland cannot be maximized.

Patents CN1880583A and CN101723514A use native species to restore natural wetland ecosystems and water quality control in the lakeside zone. However, this method needs to select suitable plants according to different water level gradients, and cannot adjust the water level to meet the needs of different growth periods of wetland vegetation.

Patent CN103774607A repairs the base by digging ponds and stacking islands in the lakeside area to further form a "pond, lake and bay water network system". However, this method lacks the overall design of the wetland ecosystem and is not suitable for coastal tidal fluctuations. Habitat conditions, let alone large-scale restoration of salt marsh vegetation

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