CN103321194B - A kind of nonirrigated farmland ecological intercepting irrigation canals and ditches and construction process thereof adopting slope protecting technique - Google Patents
A kind of nonirrigated farmland ecological intercepting irrigation canals and ditches and construction process thereof adopting slope protecting technique Download PDFInfo
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Abstract
A kind of nonirrigated farmland ecological intercepting irrigation canals and ditches and construction process thereof adopting slope protecting technique.This irrigation canals and ditches cross section is inverted trapezoidal, and furrow bank is close to the compacting soil body and is covered with three-dimensional plant net, and plant lays wet soil on the net, wet soil is laid the turf of root system of plant prosperity; The perennial water plant of the staggered plantation of bottom of trench " S " type.The construction process of irrigation canals and ditches comprises: furrow bank, on the basis that the soil body is tamped, is close to the compacting soil body and is laid one deck three-dimensional plant net, and overlay one deck wet soil to can't see plant net, after lay the turf of root system of plant prosperity immediately.The application of the present invention by three-dimensional plant net slope protecting technique and the Reasonable Arrangement of furrow bank both sides and bottom of trench plant, the anchorage effect of root system and plant net is utilized to strengthen its structural stability, the purer Earthen ditches of its ditch body strength of stability can improve 4-5 doubly, and application life extends greatly.Construction costs of the present invention and maintenance cost is low, pollutant interception result is good, Stability Analysis of Structures, landscape effect are good, is suitable for large scale application.
Description
Technical field
The invention belongs to widespread pollution from the overuse of fertilizers and pesticides in rural area control technology field, be specifically related to a kind of the nonirrigated farmland ecological intercepting irrigation canals and ditches and the construction process thereof that adopt slope protecting technique.
Background technology
In recent years, along with nonirrigated farmland plantation modernization and intensive high speed developments such as woods fruit, outdoor vegetables, for the high yield that covets, excessive and the unreasonable service condition of chemical fertilizer application day by day highlights, soil compaction and degree of salinity increase the weight of, and the nitrogen and phosphorus loss that storm runoff causes is serious, is the major reason causing region body eutrophication, particularly granular absorption state N and P losses occupies larger specific gravity, accounts for 40% and about 60% of loss total amount respectively.
For nonirrigated farmland Runoff contaminants loss feature, take the technology such as covered ground, deep application of fertilizer, rational application of fertilizers all can cut down a part of nitrogen and phosphorus loss on source, and Be very effective.But cost of production increase causes such Technique Popularizing application difficulty to strengthen on the one hand, after adopting Sources controlling method, still has major part pollutant to enter surrounding body by runoff draining simultaneously.Therefore, domestic and international experts and scholars have carried out the Study and appliance work of ecological canal, and the research especially for the supporting ecological intercepting irrigation canals and ditches of rice terrace is applied, and the research of Farmland Flow Pollution thing Interception Technology achieves remarkable achievement.But Dry Farmland irrigation canals and ditches service function has its particularity, drainage efficiency requires higher, and General Requirements 1 ~ 3d rainfall 1 ~ 3d drains into face, field without ponding, therefore the escape canal cross dimension of nonirrigated farmland coupling is general larger.Existing nonirrigated farmland whole concrete irrigation canals and ditches engineering cost is high, pollutant interception result is poor, although and traditional Earthen ditches good purification, but owing to affecting larger by horizontal and vertical sluicing, the problems such as easy generation furrow bank caves in, bottom of trench siltation, and then affect draining and the purification function of irrigation canals and ditches itself.
Summary of the invention
The object of the invention is to: provide one can effectively block nonirrigated farmland pollution of area source, integrate farmland prevention waterlogging and tackle with Runoff contaminants, adopt nonirrigated farmland ecological intercepting irrigation canals and ditches and the construction process thereof of slope protecting technique.
Design of the present invention: in conjunction with China's current nonirrigated farmland escape canal construction situation, three-dimensional plant net slope protecting technique is applied in the construction of ecological intercepting irrigation canals and ditches, and according to irrigation canals and ditches drainage system hydraulics and engineering mechanics feature, corresponding water plant is planted in furrow bank both sides and bottom of trench, utilize the anchorage effect of root system and three-dimensional plant net to reach trench architectures to stablize, when low cost drops into, give full play to its ecological purification function.
Technical scheme of the present invention is as follows:
A kind of nonirrigated farmland ecological intercepting irrigation canals and ditches adopting slope protecting technique, its ditch body cross section is inverted trapezoidal, and its furrow bank, on the basis that the soil body is tamped, is close to the compacting soil body and is equipped with one deck three-dimensional plant net, three-dimensional plant is equipped with one deck wet soil on the net, wet soil is equipped with the turf of root system of plant prosperity; The water inlet end of irrigation canals and ditches is provided with coarse rack, and water side is provided with controlled emptying gate.
The ditch body cross dimension of above-mentioned irrigation canals and ditches is preferred: upper wide 1.7m; Lower wide 0.5m; Ditch depth 1.2m; Superelevation (i.e. the gallery at irrigation canals and ditches top bear down on one exceed the height in face, field, farmland) is 0.2m preferably.EM2 model is selected in three-dimensional plant network optimization.The length of irrigation canals and ditches and the supporting facility such as water inlet, grid are arranged depending on farmland layout situation.
The furrow bank of above-mentioned irrigation canals and ditches is equipped with bermudagrass grass skin, or kind is implanted with the tuber of dwarf lilyturf or sedge; Bottom of trench kind has the perennial water plant of the plantation in " S " type interlace mode, as wild rice stem, mullet grass etc.; Spacing in the rows between above-mentioned water plant is 250-300mm.
The construction process of the nonirrigated farmland ecological intercepting irrigation canals and ditches of above-mentioned employing slope protecting technique is as follows:
First, probe is carried out to the dry farmland layout, filling drainage system present situation, soil soil mechanics feature, periphery hydraulic condition of river situation etc. intending building ecological intercepting irrigation canals and ditches, and the widespread pollution from the overuse of fertilizers and pesticides in rural area feature that the farmland planting of grasp coupling comprehensively pattern produces; Then, on aforementioned base, pass through site inspection, determine to plan to build ecological intercepting irrigation canals and ditches position, length, cross dimension etc., selected aquatic plant species and implantation methods, establishment engineering atlas and budget, grasp weather information, winter-spring season successive cloudy days gas (large rainfall can not be had to occur) is selected to carry out on-the-spot civil engineering, and strict construction management;
Wherein, the on-the-spot civil engineering method of above-mentioned nonirrigated farmland ecological intercepting irrigation canals and ditches is as follows:
Trimming or body of newly ditching, ditch body cross section is inverted trapezoidal; Furrow bank, on the basis that the soil body is tamped, is close to the compacting soil body and is laid one deck three-dimensional plant net, and overlay one deck wet soil to can't see plant net, after lay the turf of root system of plant prosperity immediately; In bottom of trench planting aquatic plants; Arrange coarse rack at the water inlet end of irrigation canals and ditches, water side arranges controlled emptying gate.
The concrete operation step of the on-the-spot civil engineering of above-mentioned nonirrigated farmland ecological intercepting irrigation canals and ditches is as follows:
(1) trimming or body of newly ditching, ditch body cross dimension is preferred: upper wide 1.7m, lower wide 0.5m, ditch depth 1.2; The preferred 0.2m of superelevation; According to irrigation canals and ditches length and the furrow bank both sides gross area, calculate and three-dimensional plant net needed for buying, three-dimensional plant net type number preferred EM2;
(2) on the basis of furrow bank soil body compacting, furrow bank both sides are close to the compacting soil body and are laid one deck three-dimensional plant net, and three-dimensional plant net two ends are all pressed into about 100mm in the soil body (general 90-110mm), and overlay one deck wet soil to plant net is invisible;
(3) Bermuda grass turf is cut cut into strip grass block, careless block size 1200mm × 300mm, after (2) step completes, should vertically lay immediately on furrow bank; The ditch ridge about 100mm (general 90-110mm) " is put up " on turf top, the bending of other parts is adjacent to furrow bank, and suitably water after compaction, turf paving is about the general 350-450mm of 400mm(to lower end at the bottom of canal), between each careless block, spacing is set to 100-200mm; If select the furrow bank such as the tuber of dwarf lilyturf, sedge plant, then adopt sprigging mode, 3 rows are respectively planted in furrow bank both sides, spacing in the rows 100-120mm;
(4) after above step completes, in bottom of trench planting aquatic plants; Select local perennial water plant, require that phytomass is large, the kind that nitrogen phosphorus nutrient demand is high, as wild rice stem, mullet grass etc., adopt the plantation of " S " type interlace mode, different according to crop varieties, control spacing in the rows is 250-300mm;
(5) control suitable agricultural drain mouth quantity, general 3-5 mu arranges an outfall; Board plug type coarse rack is set at the water inlet end of agricultural drain mouth and irrigation canals and ditches, the preferred 500mm × 900mm of size, to filter large suspension, weeds rhizome etc.; The emptying gate of multiple height is set in the water side of irrigation canals and ditches, according to farmland drainage features in season Artificial Control.
The pollution of area source rule that the present invention produces according to nonirrigated farmland farming operation, for Earthen ditches structure and water erosion feature, utilize three-dimensional plant net slope protecting technique, be integrated with and a kind ofly integrate the nonirrigated farmland ecological intercepting irrigation canals and ditches and construction process thereof that farmland prevention waterlogging tackles with Runoff contaminants.
The present invention is on the basis of original simple and easy draining Tu Gou, carries out engineered accordingly, makes it have draining and ecological functions concurrently.By the application of three-dimensional plant net slope protecting technique and the reasonable setting of furrow bank both sides slope-protecting plant, utilize the anchorage effect of root system and plant net to strengthen its structural stability, the purer Earthen ditches of ditch body strength of stability can improve 4-5 doubly.The local perennial water plant of bottom of trench plantation, what root can be formed good secretes oxygen system, strengthens microbial activities, and then acts on by interception, absorption, absorption etc. pollutants such as making in runoff nitrogen phosphorus and removed.
Bottom of trench water plant adopts the plantation of " S " type interlace mode, after reaching the maturity period, by plant blocking function, flow velocity can be slowed down, increase the hydraulic detention time of runoff draining in channel, promote particle sedimentation, effectively coordinate plant root to secrete the absorption of oxygen system, absorption, aerobic-anaerobic effect.In addition, rational furrow bank, the configuration of bottom of trench water plant, can also form good ecoscape, and can produce corresponding economic well-being of workers and staff according to kind difference.
Beneficial effect of the present invention:
The ecological intercepting irrigation canals and ditches of employing slope protecting technique provided by the invention, Stability Analysis of Structures, integrate the anti-stagnant function of farmland water drainage and Runoff contaminants interception function.Apply ecological intercepting irrigation canals and ditches provided by the invention, ditch body structure strength of stability can improve 4-5 doubly, and application life extends greatly, effectively can tackle suspension, nitrogen phosphorus etc. in agricultural drain simultaneously.The advantages such as the present invention has construction costs and maintenance cost is low, pollutant interception result is good, Stability Analysis of Structures, landscape effect are good, have good application value.
The nonirrigated farmland ecological intercepting irrigation canals and ditches of employing slope protecting technique provided by the invention, there is following features: one is when low cost drops into, its structural soundness is improved greatly, the ability resisting rain drop erosion and irrigation canals and ditches bottom water erosion strengthens, and then greatly reduce later maintenance overhead cost, extend its application life; Two is can play effective interception function to nonirrigated farmland runoff drainage pollutes thing, and the interception rate of nitrogen is about 50-60%, and the interception rate of phosphorus is 55-70%, especially can reach more than 95% to the interception rate of particle in water (SS); Three is because this invention is transformed based on original farmland ditch, reaches the object do not occupied cultivated land, and engineering cost is low, it is simple and easy to operate, and is particluarly suitable for Taihu Lake basin and even the large scale application of east China river network in plain areas.
Accompanying drawing explanation
Fig. 1 is the schematic cross-sectional view that the present invention adopts the nonirrigated farmland ecological intercepting irrigation canals and ditches of slope protecting technique;
Fig. 2 is the controlled flashboard of water outlet that the present invention adopts the nonirrigated farmland ecological intercepting irrigation canals and ditches of slope protecting technique;
Fig. 3 is the section design sketch that the present invention adopts the nonirrigated farmland ecological intercepting irrigation canals and ditches of slope protecting technique.
In figure: 1, three-dimensional plant net 2, emptying gate 3, farmland soil 4, compacting soil
Detailed description of the invention
Embodiment 1
This application test engineering is positioned at blueberry planting base, Modern Agricultural Park, Qingpu district (E 121.010 °, N30.969 °), coupling farmland is blueberry field, original escape canal is simple and easy Tu Gou, due to reasons such as rain drop erosiones, the outstanding problems such as furrow bank caves in, impeded drainage, often need drop into a large amount of manpower and materials reparation every year.Thus, based on the requirement of Upper Reaches of Huangpu River blue or green western regional nonirrigated farmland water drainage prevention against water-logging, the technical data provided according to the design is transform as the ecological intercepting irrigation canals and ditches having the prevention waterlogging stagnant function of row and ecological intercepting function concurrently.
As shown in Figure 1, irrigation canals and ditches cross section is inverted trapezoidal, and on the basis of furrow bank soil body compacting, paste soil and lay one deck three-dimensional plant net 1, two ends are all pressed into 100mm in soil, and overlay one deck wet soil to can't see plant net, to strengthen ditch body structure stability.Plant is connected with civil engineering furrow bank closely, adopts turf transplanting mode plantation bermudagrass grass, and rye grass of replaying in the winter time.Bottom of trench plantation wild rice stem, it is large that this plant has phytomass, nitrogen P assimilation and utilization efficiency advantages of higher, and " S " type of employing interlocks planting patterns, and spacing in the rows controls as 300mm.The water inlet end of irrigation canals and ditches is provided with board plug type coarse rack, and water side is provided with the emptying gate 2 of the different water level of human controllable.
The specific operation process of the on-the-spot civil engineering of above-mentioned nonirrigated farmland ecological intercepting irrigation canals and ditches is as follows:
(1) ditch body is rebuild, ditch body cross dimension: upper wide 1.7m, lower wide 0.5m, ditch depth 1.2; Superelevation 0.2m; According to irrigation canals and ditches length and the furrow bank both sides gross area, calculate and three-dimensional plant net needed for buying, three-dimensional plant net selects EM2 model;
(2) on the basis of furrow bank soil body compacting, furrow bank both sides are close to the compacting soil body and are laid one deck three-dimensional plant net, and three-dimensional plant net two ends are all pressed into about 100mm in the soil body, and overlay one deck wet soil to plant net is invisible;
(3) Bermuda grass turf is cut cut into strip grass block, careless block size 1200mm × 300mm, after (2) step completes, should vertically lay immediately on furrow bank; The ditch ridge about 100mm " is put up " on turf top, and the bending of other parts is adjacent to furrow bank, and suitably waters after compaction, and turf paving is about 400mm to lower end at the bottom of canal, and between each careless block, spacing is set to 150mm;
(4) after above step completes, at bottom of trench planting aquatic plants wild rice stem, adopt the plantation of " S " type interlace mode, control spacing in the rows is 300mm;
(5) control suitable agricultural drain mouth quantity, every 3 mu arrange an outfall; Board plug type coarse rack is set at the water inlet end of agricultural drain mouth and irrigation canals and ditches, size 500mm × 900mm; The emptying gate of the different water level of human controllable is set in the water side of irrigation canals and ditches, to control the holdup time of different duration of raining agricultural run-off draining in ecological intercepting irrigation canals and ditches.
The effect that the present embodiment application adopts the nonirrigated farmland ecological intercepting irrigation canals and ditches of slope protecting technique to reach: one is stabilized structure, effectively can resist the water erosion that rainfall and irrigation canals and ditches draining cause, and then greatly reduce later maintenance overhead cost; Two is can play effective interception function to runoff drainage pollutes thing, agricultural drain pollutant load has larger difference according to crop growth period difference, the interception rate of nitrogen is 50-60%, and the interception rate of phosphorus is 55-70%, and particle (SS) interception rate can reach more than 95%; Three is transform based on original farmland ditch, reaches the object do not occupied cultivated land, and engineering cost is about 1/5 of the concrete irrigation canals and ditches cost that facility grainfield is built; Operate simple and easy, be convenient to promote.
Embodiment 2
This application test engineering is positioned at Modern Agricultural Park, Qingpu district (E121.027 °, N30.969 °), coupling farmland is fruit-bearing forest field, original escape canal is simple and easy Tu Gou, due to reasons such as rain drop erosiones, the outstanding problems such as furrow bank caves in, impeded drainage, often need drop into a large amount of manpower and materials reparation every year.Thus, based on the requirement of Upper Reaches of Huangpu River blue or green western regional nonirrigated farmland water drainage prevention against water-logging, the technical data provided according to the design is transform as the ecological intercepting irrigation canals and ditches having the prevention waterlogging stagnant function of row and ecological intercepting function concurrently.
As shown in Figure 1, irrigation canals and ditches cross section is inverted trapezoidal, and on the basis of furrow bank soil body compacting, be adjacent to and lay one deck three-dimensional plant net 1, two ends are all pressed into 100mm in soil, and overlay one deck wet soil to can't see plant net, to strengthen ditch body structure stability.Plant is connected with civil engineering furrow bank closely, and one-sided plantation 3 arranges the tuber of dwarf lilyturf, spacing 120mm, rye grass of replaying autumn and winter.Bottom of trench plantation mullet grass, it is large that this plant has phytomass, nitrogen P assimilation and utilization efficiency advantages of higher, and " S " type of employing interlocks planting patterns, and spacing in the rows controls as 250mm.The water inlet end of irrigation canals and ditches is provided with board plug type coarse rack, and water side is provided with the emptying gate 2 of the different water level of human controllable.
The specific operation process of the on-the-spot civil engineering of above-mentioned nonirrigated farmland ecological intercepting irrigation canals and ditches is as follows:
(1) ditch body is rebuild, ditch body cross dimension: upper wide 1.7m, lower wide 0.5m, ditch depth 1.2; Superelevation 0.15m; According to irrigation canals and ditches length and the furrow bank both sides gross area, calculate and three-dimensional plant net needed for buying, three-dimensional plant net selects EM3 model;
(2) on the basis of furrow bank soil body compacting, furrow bank both sides are close to the compacting soil body and are laid one deck three-dimensional plant net, and three-dimensional plant net two ends are all pressed into about 100mm in the soil body, and overlay one deck wet soil to plant net is invisible;
(3) select be furrow bank plant the tuber of dwarf lilyturf, adopt sprigging mode to plant, 3 rows are respectively planted in furrow bank both sides, spacing in the rows 120mm;
(4) at bottom of trench planting aquatic plants wild rice stem, adopt the plantation of " S " type interlace mode, control spacing in the rows is 250mm;
(5) control suitable agricultural drain mouth quantity, every 5 mu arrange an outfall; Board plug type coarse rack is set at the water inlet end of agricultural drain mouth and irrigation canals and ditches, size 500mm × 920mm; The emptying gate of the different water level of human controllable is set in the water side of irrigation canals and ditches, to control the holdup time of different duration of raining agricultural run-off draining in ecological intercepting irrigation canals and ditches.
The effect that the present embodiment application adopts the nonirrigated farmland ecological intercepting irrigation canals and ditches of slope protecting technique to reach: one is stabilized structure, effectively can resist the water erosion that rainfall and irrigation canals and ditches draining cause, and then greatly reduce later maintenance overhead cost; Two is can play effective interception function to runoff drainage pollutes thing, agricultural drain pollutant load has larger difference according to crop growth period difference, the interception rate of nitrogen is 50-60%, and the interception rate of phosphorus is 55-70%, and particle (SS) interception rate can reach more than 95%; Three is transform based on original farmland ditch, reaches the object do not occupied cultivated land, engineering cost be about the concrete irrigation canals and ditches cost of facility grainfield construction 1/5, operate simple and easy.
Claims (9)
1. adopt nonirrigated farmland ecological intercepting irrigation canals and ditches for slope protecting technique, it is characterized in that: it is transformed on the basis of original simple and easy draining Tu Gou, and ditch body cross section is inverted trapezoidal, and ditch body cross dimension is: upper wide 1.7m; Lower wide 0.5m; Ditch depth 1.2m; Its furrow bank is on the basis that the soil body is tamped, and be close to the compacting soil body and be equipped with one deck three-dimensional plant net, three-dimensional plant is equipped with one deck wet soil on the net, wet soil is equipped with the turf of root system of plant prosperity, or plants the furrow bank plant being implanted with root system of plant prosperity; Bottom of trench kind has in the perennial water plant wild rice stem of " S " type staggered arrangement or mullet grass, and the spacing in the rows between perennial water plant is 250-300mm; The water inlet end of irrigation canals and ditches is provided with coarse rack, and water side is provided with controlled emptying gate.
2. the nonirrigated farmland ecological intercepting irrigation canals and ditches adopting slope protecting technique as claimed in claim 1, is characterized in that, described furrow bank is equipped with bermudagrass grass skin, or kind is implanted with the tuber of dwarf lilyturf or sedge.
3. the nonirrigated farmland ecological intercepting irrigation canals and ditches adopting slope protecting technique as claimed in claim 1 or 2, it is characterized in that, described irrigation canals and ditches water inlet end coarse rack is of a size of 500mm × 900mm; Described three-dimensional plant net type number is EM2.
4. one kind adopts the construction process of the nonirrigated farmland ecological intercepting irrigation canals and ditches of slope protecting technique as claimed in claim 1, it is characterized in that: first, probe is carried out to the dry farmland layout, filling drainage system present situation, soil soil mechanics feature, periphery hydraulic condition of river situation etc. of intending building ecological intercepting irrigation canals and ditches, and the widespread pollution from the overuse of fertilizers and pesticides in rural area feature that the farmland planting of grasp coupling comprehensively pattern produces; Then, on aforementioned base, pass through site inspection, determine to plan to build ecological intercepting irrigation canals and ditches position, length, cross dimension etc., selected aquatic plant species and implantation methods, establishment engineering atlas and budget, grasp weather information, select winter-spring season to connect the cloudy weather not having large rainfall to occur and carry out on-the-spot civil engineering, and strict construction management;
The concrete operation step of the on-the-spot civil engineering of described nonirrigated farmland ecological intercepting irrigation canals and ditches is as follows:
(1) trimming or body of newly ditching, ditch body cross section is inverted trapezoidal, is of a size of: upper wide 1.7m, lower wide 0.5m, ditch depth 1.2m, superelevation 0.2m; According to irrigation canals and ditches length and the furrow bank both sides gross area, calculate and three-dimensional plant net needed for buying;
(2) on the basis of furrow bank soil body compacting, furrow bank both sides are close to the compacting soil body and are laid one deck three-dimensional plant net, and three-dimensional plant net two ends are all pressed into 90-110mm in the soil body, and overlay one deck wet soil to three-dimensional plant net is invisible;
(3) on wet soil, lay the turf of root system of plant prosperity, or the furrow bank plant tuber of dwarf lilyturf of planting plants well developed root system or sedge;
(4) after above step completes, in bottom of trench planting aquatic plants; Select local perennial water plant wild rice stem or mullet grass, adopt the plantation of " S " type interlace mode, control spacing in the rows is 250-300mm;
(5) control suitable agricultural drain mouth quantity, every 3-5 mu arranges an outfall; At the water inlet end of agricultural drain mouth and irrigation canals and ditches, board plug type coarse rack is set; The emptying gate of multiple height is set in the water side of irrigation canals and ditches, according to farmland drainage features in season Artificial Control.
5. the construction process adopting the nonirrigated farmland ecological intercepting irrigation canals and ditches of slope protecting technique as claimed in claim 4, it is characterized in that, (3) step is: cut by Bermuda grass turf and cut as strip grass block, after (2) step completes, vertically lay immediately on furrow bank; Ditch ridge 90-110mm is put up on turf top, and the bending of other parts is adjacent to furrow bank, and suitably waters after compaction, turf paving to lower end at the bottom of canal 350-450mm.
6. the construction process adopting the nonirrigated farmland ecological intercepting irrigation canals and ditches of slope protecting technique as claimed in claim 5, it is characterized in that, in (3) step, Bermuda grass turf is cut the strip grass block cut as being of a size of 1200mm × 300mm, furrow bank is vertically laid, and between each careless block, spacing is set to 100-200mm; Ditch ridge 100mm is put up on turf top, turf paving to lower end at the bottom of canal 400mm.
7. the construction process adopting the nonirrigated farmland ecological intercepting irrigation canals and ditches of slope protecting technique as claimed in claim 4, is characterized in that, in (3) step, select the tuber of dwarf lilyturf or sedge as furrow bank plant, adopt sprigging mode, 3 rows are respectively planted in furrow bank both sides, spacing in the rows 100-120mm.
8. the construction process adopting the nonirrigated farmland ecological intercepting irrigation canals and ditches of slope protecting technique as claimed in claim 4, it is characterized in that, in (2) step, three-dimensional plant net two ends are all pressed into 100mm in the soil body.
9. the construction process of the nonirrigated farmland ecological intercepting irrigation canals and ditches of the employing slope protecting technique as described in claim 4,5,6,7 or 8, is characterized in that, described irrigation canals and ditches water inlet end coarse rack is of a size of 500mm × 900mm; The model of described three-dimensional plant net is EM2.
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| CN103321194A (en) | 2013-09-25 |
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