Ecological restoration method for seawater inwelling farmlands in tropical areas

Abstract

The present invention provides an ecological restoration method for seawater inwelling farmlands in tropical areas. The ecological restoration method for seawater inwelling farmlands in tropical areascomprises the following steps: soil ridging of seawater inwelling saline-alkali soil is conducted, a full-film double ridge and furrow model is used, ridged ridges are of a trapezoidal structure, andthe ridges are vertical to a coastline direction; and salt-tolerant plants are planted on the ridges and acanthus ilicifolius is planted in ridges and furrows. Salt on the ridges are leached into theridges and furrows through natural precipitation and irrigation. The acanthus ilicifolius planted in the ridges and furrows uses salt glands to discharge the excess salt from body, and the salt-tolerant crops and acanthus ilicifolius are harvested to effectively remove the salt, an effect of reducing the salt in the soil is achieved through an on-the-ridge and below-the-ridge double function, atthe same time, growth and metabolism activities, root interpenetration and humification of dry branches, fallen leaves and dead root stubbles of the acanthus ilicifolius and various salt-tolerant plants improve physicochemical property of the soil. The ecological restoration method is high in comprehensive salt removal efficiency, increases soil fertility, is high in efficiency of reducing soil pH, can restore the soil better and faster, and also has higher economic and ecological benefits.

Description

technical field [0001] The invention relates to the technical field of ecological restoration of saline-alkali land, in particular to an ecological restoration method for flooding agricultural land with seawater in tropical regions. Background technique [0002] Since the 20th century, land salinization has developed rapidly in my country, and the salinization of cultivated land in various parts of China has become increasingly serious. Land salinization is a major cause of the degradation of the agricultural ecological environment. Hainan Island has a tropical monsoon climate, with a large area of ​​farmland distributed along the coastline. Affected by the northeast and southwest monsoons, tropical storms and typhoons are frequent, and seawater backwashing farmland occurs from time to time; especially when it is affected by strong typhoons, The seawater intrusion phenomenon is obvious, the affected farmland area is large, the soil restoration period is long, and the soil sa...

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Problems solved by technology

These methods have played a role to a certain extent, but all have obvious disadvantages: the cost of soil amendments is high, the improvement effect is limited, the salt is solidified but the total amount of salt ions is not reduced, and the fundamental problem cannot be solved. Cause secondary pollution and bring new disturbing factors to the soil; salt-tolerant plants have certain requirements on the salinity range. For soil with high salinity, the salinity exceeds the optimum growth range of salt-tolerant crops, and the crops will not grow well. , the degree of utilization is limited, and its effect on the removal of salt is relatively slow

And due to climate change, the possibility of storm surge is relatively high, so it is not conducive to long-term prevention of the impact of backflow

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