A three-dimensional structure of rapid desalination and improvement of soil profile in saline-alkali land in tidal flat reclamation area

Abstract

The invention provides a sectional three-dimensional structure for the fast desalting and soil improvement of saline-alkali soil of a new tidal marsh reclamation area. According to the sectional three-dimensional structure, a soil layer of the saline-alkali soil to be desalted is subjected to ditching at the depth of 90-100 cm, and underground pipes are buried in a manner that the burying spacing is 20-30 m and the inclination angle is 1-3 DEG, so as to form an underground-pipe drainage layer; soil of a sectional surface layer of the soil layer is grooved at the depth of 40-45 cm and is stacked in an open space aside, and straws are laid uniformly after the surface of soil is leveled, so as to form a straw isolating layer with the thickness of 5-8 cm; and chopped straws and desulfation gypsum are added into the soil of the surface layer, which is stacked aside, the chopped straws, the desulfation gypsum and the soil of the surface layer are mixed uniformly, composite soil with the thickness of 10-15 cm is laid on the straw isolating layer, infiltrating irrigation capillaries are laid in the spacing of 0.8-2 m, and rest composite soil is then laid and is leveled, so as to form a straw and gypsum mixed cultivation layer. The sectional three-dimensional structure has the advantages that the sectional three-dimensional structure is organically combined into a whole up and down, the effects on the fast desalting and soil improvement and effective salinization process inhibition of the new tidal marsh reclamation area are remarkable, and the improvement cycle for the saline-alkali soil of the new reclamation area can be shortened effectively.

Description

technical field

[0001] The invention belongs to the technical field of saline-alkali land improvement engineering, and in particular relates to a three-dimensional structure for fast desalination and soil improvement of saline-alkali land in a new sea reclamation area. Background technique

[0002] The tidal flats in the coastal areas are rich in resources, which are rare land reserve resources in our country. The implementation of scientific reclamation and development of tidal flats plays an irreplaceable role in supplementing the shortage of cultivated land resources in my country, ensuring national food security, and expanding coastal development space. However, the newly reclamation area of ​​the tidal flat has the characteristics of high salt content, shallow groundwater depth, high mineralization, poor soil texture and structure, and low natural fertility level of the soil due to the short time of soaking away from seawater and soil formation. These barrier factors h...

Examples

Embodiment 1

[0022] Such as figure 1 As shown, the present invention is applied to the saline-alkali land in the new reclamation area of ​​the tidal flat. First, the hidden pipe is buried in the saline-alkali soil layer 3 section to be desalted at a depth of 90 cm to form a hidden pipe drainage layer 4. The inclination angle of the dark pipe to the water outlet direction is 2°. The embedding distance is 20m; dig out the 45cm soil of the surface layer of the soil layer 3 section, and pile it up in the open space next to it. Add 5cm long crushed straw to the surface soil on the side, the addition amount is 20t / hm 2 , add desulfurization gypsum at the same time, the addition amount is 10t / hm 2 , mixed evenly to form straw + gypsum mixed soil; spread 15cm thick mixed soil on the straw isolation layer, level it, and then lay infiltration capillary at 1.2m intervals (buried as deep as 30cm above the ground), and then spread the remaining mixed soil The soil is leveled to form a straw-gypsum m...

Embodiment 2

[0025] The present invention is applied to the saline-alkali land in the new reclamation area of ​​the tidal flat. First, the hidden pipe is buried in the saline-alkali soil layer 3 section to be desalinated at a depth of 100 cm to form a drainage layer 4 of the hidden pipe. 30m; dig out the 40cm soil of the surface layer of the soil layer 3 section, and pile it up in the open space beside it. Add 8cm long crushed straw to the soil, the addition amount is 30t / hm 2 , while adding desulfurization gypsum, the addition amount is 20t / hm 2 , mixed evenly to form straw + gypsum mixed soil; spread 10cm thick mixed soil on the straw isolation layer, level it, and then lay infiltration capillary at 2m intervals (buried as deep as 30cm above the ground), and then spread the remaining mixed soil And leveled to form straw gypsum mixed tillage layer (seepage irrigation layer).

technical field

[0001] The invention belongs to the technical field of saline-alkali land improvement engineering, and in particular relates to a three-dimensional structure for fast desalination and soil improvement of saline-alkali land in a new sea reclamation area. Background technique

[0002] The tidal flats in the coastal areas are rich in resources, which are rare land reserve resources in our country. The implementation of scientific reclamation and development of tidal flats plays an irreplaceable role in supplementing the shortage of cultivated land resources in my country, ensuring national food security, and expanding coastal development space. However, the newly reclamation area of ​​the tidal flat has the characteristics of high salt content, shallow groundwater depth, high mineralization, poor soil texture and structure, and low natural fertility level of the soil due to the short time of soaking away from seawater and soil formation. These barrier factors h...

Examples

Embodiment 1

[0022] Such as figure 1 As shown, the present invention is applied to the saline-alkali land in the new reclamation area of ​​the tidal flat. First, the hidden pipe is buried in the saline-alkali soil layer 3 section to be desalted at a depth of 90 cm to form a hidden pipe drainage layer 4. The inclination angle of the dark pipe to the water outlet direction is 2°. The embedding distance is 20m; dig out the 45cm soil of the surface layer of the soil layer 3 section, and pile it up in the open space next to it. Add 5cm long crushed straw to the surface soil on the side, the addition amount is 20t / hm 2 , add desulfurization gypsum at the same time, the addition amount is 10t / hm 2 , mixed evenly to form straw + gypsum mixed soil; spread 15cm thick mixed soil on the straw isolation layer, level it, and then lay infiltration capillary at 1.2m intervals (buried as deep as 30cm above the ground), and then spread the remaining mixed soil The soil is leveled to form a straw-gypsum m...

Embodiment 2

[0025] The present invention is applied to the saline-alkali land in the new reclamation area of ​​the tidal flat. First, the hidden pipe is buried in the saline-alkali soil layer 3 section to be desalinated at a depth of 100 cm to form a drainage layer 4 of the hidden pipe. 30m; dig out the 40cm soil of the surface layer of the soil layer 3 section, and pile it up in the open space beside it. Add 8cm long crushed straw to the soil, the addition amount is 30t / hm 2 , while adding desulfurization gypsum, the addition amount is 20t / hm 2 , mixed evenly to form straw + gypsum mixed soil; spread 10cm thick mixed soil on the straw isolation layer, level it, and then lay infiltration capillary at 2m intervals (buried as deep as 30cm above the ground), and then spread the remaining mixed soil And leveled to form straw gypsum mixed tillage layer (seepage irrigation layer).

Images