Method for restoring degraded coastal wetland in Yellow River old riverway areas

Abstract

The invention relates to a method for restoring degraded coastal wetland in Yellow River old riverway areas. The method comprises the following steps: (1), leveling soil of selected degraded coastal saline-alkaline wetland in Yellow River old riverway areas for later use; (2), in early may every year, irrigating the prepared standby saline-alkaline wetland, sowing primed suaeda glauca seeds in the irrigated soil, covering the seeds with soil, then covering the surface soil with suaeda glauca residues; and (3), carrying out normal management and reasonable irrigation and tinning out when suaeda glauca grows up to 4.5-5.5cm, wherein the suaeda glauca density maintains 45-55 plants / m<2>. According to the method, the salt-tolerance vegetation suaeda glauca subjected to different moisture interferences and covered by plant residues can be utilized to restore the specific degraded wetland in Yellow River old riverway areas, so that the soil nutrient status is improved obviously, the soil salinity is reduced greatly, and high ecological benefits are achieved.

Description

technical field [0001] The invention relates to a restoration method for coastal degraded wetlands in the old course area of ​​the Yellow River, in particular to a method for restoring degraded wetlands in the old course area of ​​the Yellow River by regulating water and planting salt-tolerant vegetation, and belongs to the technical field of environmental protection and restoration of degraded wetlands. Background technique [0002] In recent years, due to the impact of global environmental changes and the increasing intensity of human development and utilization of wetlands, the wetland ecosystem has been seriously degraded, the area and resources of wetlands have been decreasing, and the quality and functions have continued to decline. According to statistics, more than 50% of the wetlands in the world have been changed, degraded or lost. From 1950 to 2003, the area of ​​coastal wetlands in my country's coastal areas increased from 13.81×10 6 hm 2 Reduced to 5.24×10 6 ...

AI Technical Summary

Problems solved by technology

In terms of restoration technology, the current restoration methods for degraded wetlands in this area are relatively simple, mainly based on the natural restoration model based on fresh water supplementation, and the restoration effect depends on the time and amount of fresh water replenishment, while the artificially promoted restoration model has not yet been developed. effective practice

Since the evaporation of the Yellow River Delta is much greater than the precipitation, and the evaporation ratio is about 3.5, the wetland restoration model based on freshwater recharge is only effective in the degraded wet areas of the Yellow River estuary, but not in other areas, especially in the old Yellow River area. universality

Images