Method for restoring degenerated saline wetland through intercropping of tamarix chinensis and suaeda heteroptera

Abstract

The invention discloses a method for restoring a degenerated saline wetland through intercropping of tamarix chinensis and suaeda heteroptera. The method includes the following steps of firstly, selecting a coastal degenerated saline wetland with salt content of 0.5-1% in a Yellow River Estuary, and irrigating the coastal degenerated saline wetland where tamarix chinensis cuttings are planted. Local saline-alkaline tolerance plants, namely tamarix chinensis and suaeda heteroptera, are selected as the species for ecologically restoring the coastal degenerated saline wetland, the two species oftamarix chinensis and suaeda heteroptera are intercropped, the stability of an ecologic system can be greatly improved, the forward succession of the ecologic system is promoted, the operation methodis simple, the survival rate of tamarix chinensis reaches 95%, the ecology of the saline land can be rapidly restored, the tamarix chinensis and suaeda heteroptera can be used for high-quality papermaking raw materials and promote the development of the local papermaking industry, the emergence rate of suaeda heteroptera is 90% or above, suaeda heteroptera can reduce soil salt content and can alsobe used as vegetables and feed, dual purposes are achieved, economic and ecologic benefits are remarkable, and the method can be applied and popularized in the heavy saline land in the Yellow River Delta.

Description

technical field [0001] The invention relates to the technical field of environmental ecological management, in particular to a method for restoring degraded saline-alkali wetlands by intercropping tamarisk and Suaeda salsa. Background technique [0002] Saline-alkali land is a general term for saline soil and alkaline soil. We call the soil containing a large amount of saline-alkali soil saline-alkali soil, and the area with a large amount of saline-alkali soil is called saline-alkali area. Soil salinization means that under the influence of natural or human factors, salt Alkaline components accumulate in the soil, making other types of soil gradually evolve into saline soil. Coastal degraded saline-alkali wetland is another type of saline-alkali land, mainly distributed in coastal areas. Due to long-term immersion in seawater, the soil in the soil Neutral salts such as sodium chloride and sodium sulfate are continuously deposited, the concentration of sodium ions is too hig...

AI Technical Summary

Problems solved by technology

②Soil nutritional conditions become poor

Under the influence of drainage, salt washing and increased quota irrigation, soil nitrogen loss is serious, organic matter is the main source of soil phosphorus, and the decomposition products of organic matter can release phosphorus to improve its effectiveness. The content of organic matter in saline-alkali soil is low. The content of available phosphorus is also low. In addition, the pH value of saline-alkali land is high and the content of calcium carbonate is high. Phosphorus in the soil is easy to form insoluble phosphate, thereby reducing the availability of phosphorus. In addition, trace elements such as zinc, manganese, iron, and copper Both are also less effective due to high soil pH

③ Poor soil physical properties

The saline-alkali soil structure is poor, the number of water-stable aggregates with a diameter greater than 0.25 mm is small, the porosity is low, the non-capillary pores are few, the cohesion is poor, the moisture retention capacity is poor, the soil colloidal Na+ content is high, the water permeability is poor, and the soil gel salt is difficult. The effective water content of the soil is low, the ineffective water content increases significantly, the water supply capacity is poor, the ground temperature is low in spring and autumn, and the soil is cold, which affects the timely sowing of crops and the growth of seedlings. The high ground temperature in summer accelerates surface evaporation and salt accumulation, and the soil solution directly Poisonous crop cells, poor crop growth lead to lack of seedlings, reduced yield, and death. Land salinization not only harms the soil conditions on which crops depend, but also affects the growth of crops, resulting in lack of seedlings or death of crops, thus hindering the development of agricultural production. , soil salinization is an important limiting factor for the development of local agricultural economy, and wetland soil degradation will reduce soil moisture, increase soil bulk density and soil particle volume, reduce porosity, and reduce flood and drought resistance, which will lead to biological Diversification sharply decreases, soil erosion intensifies, and flood and drought disasters are frequent, causing huge economic losses, and even threatening human health and life. In view of the above problems, the present invention is specially designed to solve