CN103828506A

CN103828506A - Method for improving dredger fill into greening soil

Info

Publication number: CN103828506A
Application number: CN201210487921.6A
Authority: CN
Inventors: 刘立民; 尚军; 于靖; 张建唐; 王素君; 李春光; 张莉莉; 李媛
Original assignee: Tianjing Port Environment Protection Health Administration Center Tianjin North Garden Ecological Te
Current assignee: TIANJIN PORT HAIWAN GARDEN GREENING CO., LTD.
Priority date: 2012-11-27
Filing date: 2012-11-27
Publication date: 2014-06-04

Abstract

The invention provides a method for improving dredger fill into greening soil, and belongs to methods for improving poor soil sources. The method comprises the technical approaches that after coastal dredger fill settles and is solidified, chemical and biological improvement is conducted on the dredger fill, the improving method comprises the steps that a salt elimination device and an eluvial horizon are laid in a reverse dug groove, the reverse dug groove is refilled with soil and then leveled, ameliorants are stirred in the surface layer with the thickness being 0 cm-60 cm and mixed evenly, irrigation drip washing is conducted, sesbania is planted, harvested within one growing period and turned into the soil, and greening seedlings are planted commonly. The method can effectively improve physical and chemical properties of the dredger fill and rapidly reduce the content of salt in the dredger fill, is obvious in improving effect, and makes effective use of coastal soil resources difficult to use.

Description

A kind of barged-in fill improvement is the native method of greening

Technical field

The invention belongs to soil melioration field, the one that relates in particular to coastal Tu Yuan improvement is utilized method.

Background technology

The soil that after the mud land reclamation of bay, fixed drainage forms, is referred to as barged-in fill in the engineering of bay, possesses some fundamental propertys of soil, as colloidal nature, adsorptivity, replacement etc., mechanical composition mostly is powder (sand) grain and clay, soil structurelessness, hard when dry, muddy when wet.Solvable salt content is high, and generally, more than 1.5%, sodium, chlorion account for the absolute predominance of total ion concentration.Ventilation infiltration ability extreme difference, directly uses water wash, and salinity is difficult to wash off.In a word, due to the severe physicochemical character of barged-in fill, can not directly be used as planting technique soil, the greening in barged-in fill district adopts the method for soil removal and replacement to carry out conventionally.Forbidden by country but buy the behavior of mold, therefore, the barged-in fill method that directly improvement is used as planting technique soil is applied extremely urgent.

At present, various countries are mainly reflected in following technology to the ameliorative measure of saline-alkali soil: water conservancy improvement, physically improved, chemical modifying and biological modification, and all application to some extent in actual production of different mode of ameliorating, but all can not get a desired effect.Not to invest too highly, be subject to exactly condition restriction.The object of this invention is to provide a kind of soil and directly improve the effective way native for greening, it has overcome the shortcoming of prior art, and chemical modifying and biological modification are organically combined, and improves the physical behavior of barged-in fill simultaneously, reduce too high salinity, be finally able to plant greening seedling.

PORT OF TIANJIN planning hydraulic reclamation area 200km ², now become land 70km ², the 30km of shaping ², to the year two thousand twenty, the afforestation coverage rate of PORT OF TIANJIN will reach 25%, the main region that these land resourcess of hydraulic reclamation are afforested after being all, and therefore, it is that greening soil is the effective way of accelerating at present Urban Greening that barged-in fill is directly improved.

Summary of the invention

The present invention, by chemical modifying and biological modification are organically combined, utilizes the improving effect of chemical improvement agent by barged-in fill quick desalination, the greening soil that is the garden seedling tree of can directly planting by barged-in fill improvement rapidly.Main contents of the present invention are: the hydraulic reclamation soil of coastal hydraulic reclamation through sedimentation, fixed after, carry out chemical-biological improvement, first anti-channeling is laid salt discharge facility and is drenched layer, and blind pipe spacing 2m～6m is double blinding pipe or single blind pipe in anti-channeling, specifically according to soil salt content, drench layer and lay 15cm～20cm, drench layer and complete rear backfill barged-in fill, ground grading, soil salt tiling modifying agent is pressed on top layer, and amount of application is for being 8kg～16kg/m ², 0～60cm mixes with top layer, and mechanical bond is manually puddled modifying agent and barged-in fill evenly, irrigation leaching.On barged-in fill after drip washing, according to the amount sowing sesbania of 4～10,000 grams/acre, after one season of growth, gather in, machinery is ploughed deeply in the following soil body of 20cm, the greening seedling of planting.

Embodiment

The east side, road of bordering on the sea at Tianjin Dong Jianggang adopts the method to carry out barged-in fill improvement, demonstration ground area 1000 square meters, the average salt content of soil is 1.5%, pH8.3, carry out at the scene anti-channeling salt discharge engineering in April, 2011, blind pipe spacing 4m, lays double blinding pipe in anti-channeling, drench layer and adopt clean stone nitre, laying depth is 20cm.Drench layer and complete the thick barged-in fill of rear backfill 1.2m, after scene is smooth, execute modifying agent, modifying agent consists of 10 parts of desulfurated plasters, 65 parts of cow dungs, 8 parts of superphosphate, 17 parts of humic acid fertilizers, every square meter consumption is 12kg, after soil surface tiling, excavator mixes 3 times back and forth, mixing the degree of depth is 60cm, manually puddles afterwards leveling again.

Mix the rear washing salinity by irrigation of carrying out in time, desalinization of soil by flooding or leaching water consumption 1.0m ³/ m ², point carry out the desalinization of soil by flooding or leaching for 5 times to pour water.After the desalinization of soil by flooding or leaching completes, sow Sesbania seed according to the amount of 10,000 grams/acre May, gather in sesbania autumn by the end of October, rotovator is ploughed deeply sesbania below soil layer 20cm, carrying out the winter plants, plant Chinese scholar tree, Amur honeysuckle, Chinese wax and midget crabapple, survival rate is all more than 89%, and the coming year, nursery stock germinateed early, growth is normal, does not occur salt damage.

Claims

1. a barged-in fill improvement is the native method of greening, it is characterized in that the soil of coastal hydraulic reclamation is after sedimentation, reinforcing, carry out chemistry, biological modification, concrete ameliorative measure is: anti-channeling is laid salt discharge facility and drenched layer, smooth after reclaimed soil, top layer 0-60cm mixes modifying agent, puddle evenly irrigation leaching, plantation sesbania, in the vegetative period, harvesting is ploughed under in soil, general planting greening seedling;

2. method according to claim 1, anti-channeling is wherein laid salt discharge facility and is drenched layer, embodiment is: according to the total salt content of soil, formulate the Lay interval of salt discharge blind pipe, barged-in fill district is generally 2m～6m, in an anti-channeling, can be also single blind pipe for double blinding pipe, specifically according to soil salt content, drenching layer laying depth be 15cm～20cm;

3. according to the method described in claim 1, its mesexine 0～60cm mixes modifying agent, the main component of modifying agent is desulfurated plaster, cow dung or thick fertilizer, superphosphate and humic acid fertilizer, its proportion is: 5～10: 55～70: 5～10: 15～25, every square meter consumption is 8kg～16kg, and excavator is puddled in conjunction with artificial thin whole mixing;

4. according to the method described in claim 1, wherein said irrigation leaching water consumption is calculated according to the salt content of barged-in fill; Empirical equation is as follows: M=(C1-C2) ShD/K

In formula: M---rinse institute's water requirement, unit is m ³(every m ²irrigation quantity)

C1---the soil salt content before flushing

C2---the soil salt content that after rinsing, requirement reaches

S---site area (m ²)

H---desalination layer thickness (m)

D---the bulk density of soil (10 ³kg/m ³)

K---salt discharge coefficient (kg/m ³water, i.e. every cubic metre of salt amount that washing is gone), K value is 8～12kg/m ³water;

5. according to the method described in claim 1, plantation sesbania is the amount trench sowing according to 4～10,000 grams/acre on barged-in fill, after one season of growth, gathers in, and machinery is ploughed deeply in the following soil body of 20cm.