A low-cost temporary greening device for coastal dredging and reclamation of heavy saline-alkali urban construction reserved land

Abstract

The invention relates to a low-cost temporary greening device for a coastal reclamation high-saline and alkaline city building reserve land. The device comprises a water supply case, a planting soil case, a supporting column and a water guiding system for connecting a water in the water supply case and a soil layer in the planting soil case; and the planting soil case is positioned in the water supply case, the supporting column is arranged at the bottom of the planting oil case, and a water supply port and a drain port are formed on the side wall of the water supply case. The greening device provided by the invention is simple in structure, convenient to process and manufacture and easy to move and place, can be repeatedly used, and is long in service life cycle which can reach longer than 10 years.

Description

technical field [0001] The invention relates to a temporary greening device, in particular to a low-cost temporary greening device for heavy saline-alkali land, in particular to a low-cost temporary greening device for coastal dredging and filling of heavily saline-alkali (≥20g / kg) urban construction reserved land. Background technique [0002] Coastal dredging is a sedimentary soil formed by dredging the seabed mud from the offshore through hydraulic dredging. Due to the absence of soil formation process and the long-term impact of seawater immersion, the soil salt content is extremely high. The soil salt content can reach more than 80g / kg in the initial stage of dredging filling. As the years of dredging filling increase, the salt content decreases. However, due to the tight texture and poor structure of the dredger fill soil, the natural desalination rate is extremely low, and the desalination cycle is extremely long. It often takes 7 to 10 years for the salinity content ...

AI Technical Summary

Problems solved by technology

Due to the absence of soil formation process and the long-term impact of seawater immersion, the soil salt content is extremely high. The soil salt content can reach more than 80g / kg in the initial stage of dredging filling. As the years of dredging filling increase, the salt content decreases. However, due to the tight texture and poor structure of the dredger fill soil, the natural desalination rate is extremely low, and the desalination cycle is extremely long. It often takes 7 to 10 years for the salinity content of the top soil of the dredger fill soil to drop below 20g / kg. At this time, the pioneer plant Suaeda salsa was able to grow in patches, and as the salinity decreased, other salt-tolerant and halophytic plants began to gradually invade and grow.

Under natural conditions, the saline-alkali land in the early stage of dredging filling is basically in the state of bare land, and conventional salt-tolerant and halophytic plants cannot survive. The improvement of the quality of dredging fill soil depends entirely on the emergence and growth of the pioneer plant Suaeda salsa, but the idle time in the early stage is too long , which cannot meet the current ecological construction speed and landscape construction requirements of land reclamation cities

[0003] The reserved land for coastal reclamation and urban construction is a medium- and short-term urban temporary idle land. Since there is no soil-forming process and it is affected by seawater immersion for a long time, the soil has high salt content (≥20g / kg) and strong alkalinity (pH≥ 8.0), the texture is tight and the structure is poor. Suaeda salsa and Tamarix and other halophytes and strong salt-tolerant plants cannot survive under natural conditions. Ecological planting on the reserved land, but the construction cost is high, the construction period is long, and the maintenance task is heavy, so it is not suitable for the greening construction of the reserved land for urban construction with heavy salinity

The characteristics of reserved land for urban construction determine that its ecological construction requires less investment, quick construction, and easy maintenance. The existing saline-alkali land greening technology is completely unsuitable for greening construction of reserved land for heavy saline-alkali urban construction

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