CN102144492A

CN102144492A - Method for improving coastal saline soil by using solidago canadensis

Info

Publication number: CN102144492A
Application number: CN 201110057998
Authority: CN
Inventors: 有祥亮; 夏檑; 沈烈英; 王洪
Original assignee: SHANGHAI INST OF GARDEN SCIENCE
Current assignee: Shanghai Academy of Landscape Architecture Science and Planning
Priority date: 2011-03-11
Filing date: 2011-03-11
Publication date: 2011-08-10
Anticipated expiration: 2031-03-11
Also published as: CN102144492B

Abstract

The invention relates to a method for improving coastal saline soil by using solidago canadensis, in particular to a saline soil improvement project for improving the saline soil by using invasive plants, belonging to the technical field of soil improvement. The method comprises the following steps of: marking out a land parcel to be improved; removing a surface soil layer above the ground water level in parallel to form a flat pit; uniformly covering the flat pit with an isolating material to form an isolating layer, and filling soil on the isolating layer for flattening, wherein the isolating material is solidago canadensis, and the isolating layer is made from 1.5-2 m of collected solidago canadensis or dry solidago canadensis branches with nearly equal length; binding the solidago canadensis or dry solidago canadensis branches into bundles with about 40 cm in thickness, spreading the bundles in the pit and compacting the pit; and backfilling the surface soil. The method has the advantage of changing the waste solidago canadensis litters into the valuable for improving coastal saline soil, not only can a great amount of solidago canadensis litters be consumed, but also saline soil can be improved. Through the massive application of the method provided by the invention, the wide spreading of solidago canadensis can be relieved and weakened. The method is simple and convenient to operate, has low cost and is applicable to large-scale popularization and application.

Description

A kind of method with Solidago Canadensis improvement beach salty soil

Technical field

Belonging to the soil melioration technical field, exactly relate to salt-affected soil improvement engineering, is about utilizing the method for instruction plant deadwood as underground isolated material improvement beach salty soil.

Background technology

Solidago Canadensis originates in American-European countries, and last century, the seventies was introduced China as flower plant.Because of its powerful fertility with to the damage capability of indigenous plant, make and overflow in the Yangtze River Delta Area in decades.Also there is not effective extinction method at present.Annual autumn and winter season produces a large amount of withered stem branches of goldenrod.Beach salty soil is the main soil types of Deposits in Eastern Coastal China beach, and the east coastal be one of economic most developed area of China, there is distribution big and medium-sized cities such as Shanghai, Tianjin, Yancheng, Ningbo more, coastal economy technological development zone builds in the ascendant, among corresponding supporting afforestation construction being is also is being designed and constructed.Build the engineering improving technology of needed beach salty soil as afforestation, more than subterranean water level, do separation layer, obtained using comparatively widely with vegetable material such as agricultural crop straw or non-biological material such as slag, stone etc.But utilize the deadwood of instruction plant Solidago Canadensis to do isolated material, and obtain improved effect preferably.This does not see the open report or the mandate that patents at home and abroad as yet.

Summary of the invention

The present invention will implement to become the useless treasured for the improvement beach salty soil of goldenrod litter, the goldenrod litter of not only can dissolving in a large number, and can improve a kind of method that improves beach salty soil with Solidago Canadensis of saline soil.

The technical solution used in the present invention is:

Method with Solidago Canadensis improvement beach salty soil comprises following steps: mark the improvement plot on the ground at coastal saline-alkali; Descend height of water level definitely; Above subterranean water level, wait level, the parallel topsoil of removing to become flat hole; Flat hole is gone up the even isolated material that covers and is constituted separation layer, and it is smooth to banket on separation layer, and its scheme is: isolated material is a Solidago Canadensis; Described separation layer is that the 1.5-2m that collects is close to isometric goldenrod or goldenrod deadwood, and colligation is tiled in the hole compacting into about thick the tying up of 40cm by tying up longitudinal and transverse direction; Backfill table soil.

Good effect of the present invention is:

Realized becoming the useless treasured of goldenrod litter into the improvement beach salty soil, the goldenrod litter of not only can dissolving in a large number, and can improve saline soil; The extensive application of this invention will slow down and weaken spreading unchecked of goldenrod.The present invention is easy and simple to handle, cost is low, is suitable for large application scope.

Description of drawings

Fig. 1, for cross-sectional view of the present invention,

Embodiment

Now the invention will be further described in conjunction with the accompanying drawings

A kind of method with Solidago Canadensis improvement beach salty soil comprises following steps: mark the improvement plot on the ground at coastal saline-alkali; Descend height of water level definitely; Above subterranean water level, wait level, the parallel topsoil of removing to become flat hole 1; Flat hole is gone up and is evenly covered isolated material and constitute separation layer 2, and on separation layer, banket, smooth, its formation is: isolated material is a Solidago Canadensis; Described separation layer is that the 1.5-2m that collects is close to isometric goldenrod deadwood, and colligation 4 is into about thick the tying up of 40cm, in, horizontal 6 directions vertical 5 by tying up are tiled in and cheat, and compacting; Backfill table soil 3.

Embodiment 1

1, position experimental field: East Sea sea wall closes in Shanghai City Bai Longgang waste water treatment plant area;

2, the collection of goldenrod: 1-2 month is waste on the ground with the withered stem of reaping hook subsides face of land harvesting goldenrod, height 1.5～2.0m at East Sea beach.Tie up with straw rope and to be cylindric, rugosity is about 40cm, transports to experimental field standby;

3, experimental field prepare: area is 20m * 20m, i.e. 400m ², being divided into two parts of 10m * 20m, the line of demarcation is an east-west direction.North side 100m ²Be the check plot, promptly do not do separation layer and handle southern side 100m ²Be the separation layer test region;

4, experimental field separation layer is handled: use digging machine at 400m ²Earth excavation in the scope digs dark 2.0m (more than the subterranean water level).Around the earthwork was deposited in, table soil was following, and subsoil is last.At separation layer test region 200m ²In the scope, the withered stem of goldenrod that tiling is tied up has been spread the back and has been used the bucket compacting, and thickness is about 20cm after the compacting.Backfill is cut the earth then, and backfill is table soil behind the first subsoil in proper order, and the only backfill earthwork in order in the scope of check plot is not simultaneously done separation layer and handled;

5, plant planting: late March is planted 5 kinds of garden plantses to early April simultaneously in check plot and test region.

6, the measured result of the underground separation layer of goldenrod

6.1 quarantine measures reduce soil salt content

Owing to take underground quarantine measures, soil accumulation of salt in the surface soil phenomenon disappears, the leaching of precipitation and irrigation in addition, the salt content of the above soil body of separation layer descends to some extent, wherein 0～60cm descends especially remarkable, as July 0-30cm deep soil EC value lay the initial stage (April) than separation layer and descend 33.6%, the 30-60cm degree of depth descends 32.8%.And 60～90cm degree of depth descends and to have only 3%, this explanation after cutting off capillarity and stopping the accumulation of salt in the surface soil, the salinity of preserving in the soil body have 1/3 by top layer, middle level drip washing to lower floor, with the drip washing time lengthening, salt branch of lower floor washes below the separation layer gradually.Meanwhile, do not establish contrast soil body EC value 0～30cm degree of depth decline 1.4%, 30～60cm degree of depth decline 3.5%, 60～90cm degree of depth decline 6.3% of separation layer.As seen contrast lays the underground separation layer of goldenrod deadwood, and in 3 months, salt content descends obviously in 0～60cm degree of depth soil body.Can predict, with the drip washing time lengthening, soil body salt content integral body also can significantly descend on the separation layer.

6.2 quarantine measures promote plant growing

Because the underground separation layer of goldenrod deadwood has reduced the salt content of the soil body on it, especially the salt content of 0～60cm degree of depth soil layer makes the amount of growth of cassia corymbosa, the rose of Sharon of plantation on it, golden gloomy glossy privet, Chinese rose, 5 kinds of undershrubs of cotton rose obviously greater than the same a collection of plant on the contrast soil body of not establishing separation layer.According to statistics, survive the growth beginning to by the end of October from planting the back nursery stock by the end of April, in 6 months, the mean height amount of growth of 5 plant species is above contrast 21%, and average paulin directly surpasses contrast 15%.Wherein, the relatively poor high amount of growth of the rose of Sharon of salt resistance surpasses contrast 28.5%, and paulin directly surpasses contrast 22.5%, and the stronger cotton rose difference of salt resistance is little, and high amount of growth surpasses contrast 9.2%, and paulin directly surpasses contrast 10.8%.As seen, relatively poor plant growing has more obvious facilitation to the underground separation layer of goldenrod to salt resistance.

Claims

1. the method with Solidago Canadensis improvement beach salty soil comprises following steps: mark the improvement plot on the ground at coastal saline-alkali; Descend height of water level definitely; Above subterranean water level, wait level, the parallel topsoil of removing to become flat hole (1); Flat hole is gone up and is evenly covered isolated material and constitute separation layer (2), and on separation layer, banket, smooth, it is characterized in that: isolated material is a Solidago Canadensis; Described separation layer is that the 1.5-2m that collects is close to isometric goldenrod deadwood, and colligation (4) is into about thick the tying up of 40cm, and vertical by tying up (5), horizontal (6) direction are tiled in the hole compacting; Backfill table soil (3).