A low-cost greening method for seaside dredging and reclamation of heavy saline-alkali bare land

Abstract

The invention relates to a low-cost greening method for a coastal hydraulic reclamation high-saline-and-alkaline exposed field. Tamarix chinensis plants are made to be in the growth mode of 'activation growth-low salinity adaptation-high salinity dormancy-low salinity fast growth' under domestication and induction by regulating the gradient arrangement of the salinity environment reasonably, so that the salt tolerance of tamarix chinensis is improved and establishment of a coastal hydraulic reclamation high-saline-and-alkaline exposed field ecology landscape is achieved. By achieving quick establishment of the hydraulic reclamation high-saline-and-alkaline exposed field ecology landscape through reasonable regulation of the gradient arrangement of the plantlet environment, salt elimination is not needed, soil condition improvement is not needed, and compared with the existing saline-alkali soil greening technique characterized in soil condition improvement and salt elimination, the method has the advantages that engineering load is reduced greatly, maintenance investment is not needed, cost is low, and construction cost is only 5-10% that of the existing saline-alkali soil greening technique.

Description

technical field [0001] The invention relates to a technical method for low-cost greening of heavy saline-alkali bare land in the coastal area, in particular to a technical method for low-cost greening of coastal heavy-saline-alkali bare land. Background technique [0002] Coastal dredging is a sedimentary soil formed by dredging the seabed mud from the offshore through hydraulic dredging. Affected by the seawater environment, the dredger fill soil has a tight texture, high salt content, and strong alkalinity, making it difficult for plants to survive, especially when the soil salt content is ≥ 25g / kg (heavily saline-alkali land). Suaeda salsa and other strong salt-tolerant and halophytic plants cannot grow at all, and the new land reclamation is in a state of bare land. The existing greening technology mainly based on "soil improvement" and "salt drainage project" can realize the new land reclamation However, the cost is high and the amount of engineering is large, and the ...

AI Technical Summary

Problems solved by technology

Affected by the seawater environment, the dredger fill soil has a tight texture, high salt content, and strong alkalinity, making it difficult for plants to survive, especially when the soil salt content is ≥ 25g / kg (heavily saline-alkali land). Suaeda salsa and other strong salt-tolerant and halophytic plants cannot grow at all, and the new land reclamation is in a state of bare land. The existing greening technology mainly based on "soil improvement" and "salt drainage project" can realize the new land reclamation However, the cost is high and the amount of engineering is large, and the bare land of coastal dredging and reclamation is mostly idle land for temporary construction. The existing greening technology is not suitable for the ecological management of dredging and reclamation of bare land, so a low-cost method is urgently needed , fast and effective greening method of heavy saline-alkali dredging and filling bare land in the coastal area