CN107258136A

CN107258136A - A kind of arid area heavy salinized ground modification method

Info

Publication number: CN107258136A
Application number: CN201710412808.4A
Authority: CN
Inventors: 杨超; 李从文; 程智鹏; 孙潜; 谢云军; 周文君; 邱林清; 王业春; 汪祥静; 谯晓君
Original assignee: Shenzhen Wenke Landscape Co Ltd
Current assignee: Shenzhen Wenke Landscape Co Ltd
Priority date: 2017-06-05
Filing date: 2017-06-05
Publication date: 2017-10-20

Abstract

The present invention relates to a kind of arid area heavy salinized ground modification method, the feature of this method includes following process step：A. soil salt infiltrates；B. top layer salinity floats；C. top layer salinity is removed；D. topsoil is removed；E. insulating course is placed；F. fertilizer layer is placed；G. topsoil is put back to；H. salt discharging pipe is laid.The brining step of the present invention effectively can quickly reduce upper soll layer salinity, rubble+geotextiles interlayer has blocked the passage that salinity is delivered up, upper strata salinity can be discharged into underground, prevent moisture conveying of the lower floor to upper strata, so as to prevent the salinity excluded from returning upper ground surface again, be conducive to the lasting holding low salt level of topsoil, and the fertilizer and soil conditioner of addition can provide certain nutrient to soil and accelerate the salt discharge speed of soil, can be with effectively save water consumption using micro- profit pipe salt discharge, this method has preferable effect for the improvement on the heavy salinized ground in arid area.

Description

A kind of arid area heavy salinized ground modification method

【Technical field】

The present invention relates to soil remediation field, more particularly to a kind of arid area heavy salinized ground modification method.

【Background technology】

Saline-alkali soil refers to soil of the salt content more than 2 ‰, and the salinization of soil does not only result in the reduction of soil productivity, and And trigger many ecological environment problems.Xinjiang, the Inner Mongol, Qinghai are three maximum provinces of China's saline alkali land area, according to statistics It is about 40% that its saline alkali land area, which accounts for national saline alkali land area ratio,；Wherein heavy salinized ground area has accounted for saline alkali land area More than half.Therefore, saline Land, has become the Northwest's agricultural development and ecological environment especially heavy salinizedly Improved great restrictive condition and restraining factors.

The Northwest's salinization soil has its own salient feature, on the one hand, this area's evaporation capacity is big, and rainfall is few, steams Drop ratio can averagely reach 1500-2000, locally can cause the Northwest especially Xinjiang region water resource pole more than 3000 Degree is deficient；On the other hand, irrigate and afforest and all use underground water with water base, level of ground water is reduced year by year, some ground of Xinjiang Area's level of ground water is in below 100m；Because level of ground water is low, the long-term anthropogenic soil accumulation of salt in the surface soil in this area is exactly mainly by irrigating Caused, salt is walked with water, and how to block water transport channel is the key for preventing the soil accumulation of salt in the surface soil, and the present invention can be very good solution, and this is asked Topic.

【The content of the invention】

A kind of arid area heavy salinized ground modification method, it is characterised in that：A. soil salt infiltrates, to wanting anthropogenic soil Top layer is sprinkled water, and infiltrates topsoil；B. top layer salinity floats, under conditions of strong illumination and evaporation, and moistening soil passes through 7 It or so is all parched, and top layer emerges a large amount of salinities；C. top layer salinity is removed, the saline and alkaline soil layer that top layer is enriched with is pushed on one side, Soil-shifting thickness is 2-3cm；D. topsoil (2) is removed, top layer 30-50cm soil is dug up；E. insulating course is placed, point two layers of paving Spread, it is original soil layer (7) that level is laid on below lower section, little particle graded broken stone with little particle graded broken stone (6), and level is matched somebody with somebody into bulky grain Graded broken stone (4) is laid on top, and places one layer of geotextiles (5) between the two layers；F. fertilizer layer (3) is placed, in bulky grain level With one layer of composting fertilizer of spreading above rubble (4)；G. fertilizer is covered in after the topsoil removed in d being mixed into soil conditioner disastrously On layer；H. laying salt discharging pipe (1), micro- profit pipe is embedded in upper layer of soil, lasting salt discharge is oozed by micro-；

It is preferred that, described soil wetted part water consumption is the water for applying 0.3-0.5m3 on every square metre of soil, Soil layer wettable layer thickness is 30-50cm；

It is preferred that, described waterpower insulating course is three-decker, includes 0.5-1cm little particle graded broken stone (6), 2- The thick geotextiles (5) of 3cm bulky grain graded broken stone (4) and 0.2-0.3cm, little particle graded broken stone (6), can be with lower section Play a part of blocking water transfer passage, middle non-woven fabrics (5) can retain portion of water and nutrient, the bulky grain on upper strata Graded broken stone 4 can be penetrated into due to soil and fertilizer from space, so playing a part of supporting plant root growth；

It is preferred that, described composting fertilizer is that the mixing after fermentation such as sheep manure, cow dung and microbial bacterial agent is become thoroughly decomposed and is made, Three kinds of compositions are according to 4：5：After 1 ratio mixing, ferment 150-200 days, throwing 2-3 times is turned over therebetween, fertilizer 3 thickness of layer are 2-3cm；

It is preferred that, described insulating course upper strata earthing, overburden layer thickness is 30-50cm, and modifying agent composition is every 100 parts and covered Humus slag, 50 parts of thermal power plant's land plasters, 30 parts of composting fertilizer and 10 parts of the microbial bacterial agent of 10 parts of addition in soil；

It is preferred that, described micro- profit pipe (1) is the pipeline that there is micropore on surface, internally under the stress of water pressure constantly Outwards ooze out, micro- profit pipe (1) a diameter of 16-20mm, seepage discharge is 1-2L/m/d, and micro- profit pipe (1) level is distributed in below ground 3- 5cm, interval 50-100cm arranges one.

Beneficial effects of the present invention are as follows：

1. the present invention can quickly reduce heavy salinized surface layer soil salt；

2. the insulating course of the present invention can prevent the hydraulic connection of underground and earth's surface, serve prevents the work of the accumulation of salt in the surface soil well With being conducive to the improvement of heavy salinized soil, and contribute to the development of root system of plant；

3. the composting fertilizer and soil conditioner of the present invention serve the effect of the heavy salinized soil of quick improvement；

4. the present invention can effective saving water resource.

【Brief description of the drawings】

Fig. 1 is the cross-sectional view of the method for the invention.

1st, micro- profit pipe；2nd, topsoil；3rd, fertilizer layer；4th, bulky grain graded broken stone；5th, geotextiles；6th, little particle level is with broken Stone；7th, original soil layer；.

【Embodiment】

1 the present invention will be described in detail below in conjunction with the accompanying drawings.

The present embodiment have chosen the regional two pieces of typical arid area salt-soda soils of Hami, labeled as N, M, wherein N Block is 2 mu, is Hami Western district center landscape shaft portion land use for greening；B areas are 3 mu, are typical arid area high salt Alkaline wasteland, saline and alkaline is high, does not there is any plant growth.Soil data N, M such as following table 1. surveyed before experiment

The soil physico-chemical index measured value of table 1

It is as follows that N, M plot carry out improvement specific method using this method：Every square metre of N plot watering 0.3m3, permeates the ground Thickness is 35cm, under conditions of average 27 DEG C of local weather daytime temperature, after evaporation 7 days, with forklift by soil thick top layer 2cm Earth layer shovel falls, and testing soil data N1 is shown in Table 1；Residue 33cm thick soil shovels in top layer are fallen, laying rubble+non-woven fabrics isolation Layer, thickness is 7cm, and its small particles graded broken stone thickness is 3.5cm, and bulky grain graded broken stone thickness is 3.5cm, centre folder one Composting fertilizer thickness 2cm on non-woven fabrics thick layer 3mm, separation layer, then in fertilizer layer overlying conditioned soil, bankets to after 30cm, The micro- profit pipe of salt discharge is laid, is set at intervals of 0.8m, the leakage of micro- profit pipe is 1.2L/m/d, after the completion of laying, then covers remaining 3cm Soil, is improved according to the soil conditioner described in this method to soil, carries out pressure salt to soil using micro- profit pipe daily, point Not Yun Hang salt discharge N2, N3 were measured to soil pH and total salt quantity in 1 month and 3 months, be shown in Table 1.

Every square metre of M plot watering 0.5m3, the thickness that permeates the ground is 45cm, average 27 DEG C in local weather daytime temperature Under conditions of, after evaporating 7 days, 3cm thick soil horizon shovels in top layer are fallen with forklift, testing soil data M1 is shown in Table 1；By top layer Soil shovel thick remaining 42cm falls, and lays rubble+non-woven fabrics separation layer, thickness is 10cm, its small particles graded broken stone thickness For 5cm, bulky grain graded broken stone thickness is 5cm, and centre presss from both sides composting fertilizer thickness on the thick non-woven fabrics of one layer of 3mm, separation layer 3cm, then in fertilizer layer overlying conditioned soil, bankets to after 37cm, the micro- profit pipe of laying salt discharge, sets at intervals of 0.6m, micro- profit pipe Leakage be 1.6L/m/d, after the completion of laying, then remaining 5cm soil is covered, according to the soil conditioner described in this method to soil Earth is improved, daily using it is micro- profit pipe to soil carry out pressure salt, be separately operable salt discharge 1 month and 3 months to soil pH with And total salt quantity is measured M2, M3,1. are shown in Table

After the processing of 3 months, two plot are carried out with afforestation cultivation, plantation water wax, red autumnal leaves barberry, purple leaf are short Cherry, connect the local common green plants such as pumila and safflower brocade band, survived, by months of observations, do not given birth to Long abnormal phenomenon.

The foregoing is only one embodiment of the present of invention, be not intended to limit the invention, it is all the present invention spirit and Any modifications, equivalent substitutions and improvements made within principle etc., are all contained within protection scope of the present invention.

Claims

1. a kind of arid area heavy salinized ground modification method, it is characterised in that：A. soil salt infiltrates, to wanting anthropogenic soil table Layer watering, infiltrates topsoil；B. top layer salinity floats, under conditions of strong illumination and evaporation, and moistening soil passes through 7 days Left and right is all parched, and top layer emerges a large amount of salinities；C. top layer salinity is removed, the saline and alkaline soil layer that top layer is enriched with is pushed on one side, to push away Soil thickness is 2-3cm；D. topsoil is removed, top layer 30-50cm soil is dug up；E. insulating course is placed, point two layers of spreading, by level Lower section is laid on little particle rubble, level top is laid on bulky grain rubble, and place one layer of geotextiles between the two layers；F. put Fertilizer layer is put, in level with one layer of composting fertilizer of spreading above bulky grain rubble；G. the topsoil removed in 4 is mixed to soil disastrously to change It is covered in after good dose on fertilizer layer；H. salt discharging pipe is laid, micro- profit pipe is embedded in upper layer of soil, lasting salt discharge is oozed by micro-.

2. a kind of arid area heavy salinized ground modification method according to claim 1, soil layer wettable layer thickness is 30- 50cm。

3. a kind of arid area heavy salinized ground modification method according to claim 1, insulating course includes 0.5-1cm level With the thick geotextiles of rubble, 2-3cm graded broken stone and 0.2-0.3cm.

4. a kind of arid area heavy salinized ground modification method according to claim 1, composting fertilizer be sheep manure, cow dung with And the mixing after fermentation such as microbial bacterial agent is become thoroughly decomposed and is made, fertile thickness of feed layer is 2-3cm.

5. a kind of arid area heavy salinized ground modification method according to claim 1, overburden layer thickness is 30-50cm, Modifying agent composition be every 100 parts of earthing in add 10 parts humus slag, 50 parts of thermal power plant's land plasters, 30 parts of composting fertilizer with And 10 parts of microbial bacterial agent.

6. a kind of arid area heavy salinized ground modification method according to claim 1, micro- profit pipe level be distributed in ground with Lower 3-5cm, interval 50-100cm arranges one.