CN103270868A - Method for improving salt tolerance of festuca ovina by hybrid seed soaking liquid of sludge and rare earth - Google Patents
Method for improving salt tolerance of festuca ovina by hybrid seed soaking liquid of sludge and rare earth Download PDFInfo
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Abstract
The invention discloses a method for improving the salt tolerance of festuca ovina by hybrid seed soaking liquid of sludge and rare earth. The hybrid seed soaking liquid of the sludge and the rare earth is composed of a sludge leaching solution and a rare earth solution with the ratio of the weight part of the sludge leaching solution to the weight part of the rare earth solution as 1:1. The sludge leaching solution is formed by the facts that the ratio of the weight part of the sludge to the weight part of distilled water is 1:2, the sludge and the distilled water are mixed, then placed for 24 hours and filtered to obtain the needed sludge leaching solution. The rare earth solution is the water solution of Ce (NO3) 3.6 H2O or La (NO3) 3.6 H20 with the concentration of 100-300mg. L-1. Experiment results show that the hybrid seed soaking liquid of the sludge and the rare earth has a certain stabilizing effect on malonaldehyde and praline of the festuca arundinacea under salt stress and on relative electrical conductivity.
Description
Technical field
The invention belongs to environmental protection technical field, relate to urban afforestation, particularly a kind of method that adopts mud rare earth mixing seed-soaking liquid to improve the Festuca Arundinacea salt resistance.
Background technology
Rare earth can promote on the one hand the growth of root system, can promote on the other hand the generation of adventive root, to the very important effect that is formed with of the division of cell and root system.It can make chlorophyll content of plant improve, and the leaf look is deepened, and can the value of making thing respiratory intensity improve, thereby accelerates Substance Transformation and Conversion of Energy.Can promote the growth of achievements in forest-tree seedling, promote Nutrient Absorption and accumulation, thereby can obtain high-quality nursery stock and can improve the survival rate that behind garden.Promote the growth of plant leaf blade and leaf area, promote tillering and branch of plant.Rare earth has the promotion effect to the growth of plant root nodule bacterium, strengthen the control ability of plant plasma membrane serves to Electrolyte Leakage, thereby it is different with requirement to the susceptibility of rare earth to the different types of crop of unfavorable growing environment resistance to improve plant, the different growing stage of same crop is also different to susceptibility and the demand of rare earth, vegetative growth phase is generally to the reaction sensitivity of rare earth, the amount of spraying is corresponding minimizing, and reproductive stage is larger to the demand of rare earth, and amount of application suitably increases.
Along with the industrialized propelling of China, the annual production of China's municipal sludge increases day by day, its enormous amount, rapid development, and a large amount of organic matter, heavy metal and pathogens etc. in mud, do not add and process any discharge meeting environment is caused to serious pollution.Developed into a kind of new source of environmental pollution, as organic element, nitrogen, phosphorus etc., in the face of this novel pollution source, people recognize gradually, recycling is only optimized Treatment of Sludge way, especially recycling sludge is used in forestry, nursery, afforestation.Meet like this requirement of sustainable development, less to eco-environmental impact.Sewage mud is rich in organic and the useful source of nutrition of plant such as N, P, K.It can substitute fertilizer and improve crop yield.The growth of using in right amount plant has facilitation preferably, promotes economic benefit, increases economic benefit.According to reports indicate that, the sewage mud of China nearly 45% is as agricultural use.The key property of mud is that moisture content is high, and content of organics is high, and mud is the solid organic matter obtained in sewage disposal process, and can special as fertilizer sources usually and other materials be used in conjunction with.
The whole world approximately 20% arable land and almost irrigateing land of half be subject to saliferous impact, according to estimates, the saline land in the whole world is just with every year 1 * 10
6-1.5 * 10
6hm
2speed increase.Also there are 4,000 ten thousand hm in salination and the secondary salinization soil of China
2above, salination has seriously affected the development with agricultural production of giving full play to of soil capabilities, and along with the deterioration of ecotope with develop unreasonably, still in further expansion.The soil alkaline problems affect agricultural production and ecotope.Therefore, the Mechanisms of Salt Resistance of research lawn plant and searching improve the effective ways of its salt resistance, can be all significant in theory and practice.Due to the soil alkaline problem, a lot of plants are difficult to adapt to its habitat conditions, the absorption meeting of high salt concentration ion to plant produce osmotic stress, ion is coerced and oxidative stress.So in former flora, having urban afforestation, to beautify the Tree Species Resources of value quite poor, becomes the bottleneck of these regional modern urbanization ecological afforestation System Constructions of restriction.Along with social development, do urban afforestation well, improve the human settlement, promote the sustainable development of the city and become the direction of current urban development.
Along with urban afforestation is carried out in all parts of the country, the Lawn Industry of China is flourish, prevention soil and water loss, and the demand on planting campaign and Deng，Dui lawn, rest and entertainment place increases day by day.But, under the adverse environmental factors such as many salinization soils, turf establishment encounters difficulties, the growth of lawn plant is suppressed, and turf quality and function are affected, and has limited further applying of lawn plant.With mud and rare earth mixed liquor, tall fescue seed is done to seed soaking, by growing state and the measurement physiology indexes of resistance stress of observing Festuca Arundinacea, inquire into the impact on Festuca Arundinacea under salt stress of mud and rare earth mixed liquor, for optimizing the application of mud on turf establishment and improving its salt-resistance, provide technical support.
Summary of the invention
The invention discloses a kind of mud rare earth seed-soaking liquid, it is characterized in that mud leaching liquor and earth solution that it is 1:1 by parts by weight form; Wherein said mud leaching liquor refers to mud: the ratio of weight and number of distilled water is to place 24h after 1:2 mixes to filter, and obtains required mud leaching liquor; It is 200-300 mg.L that earth solution refers to concentration
-1ce (NO
3)
36H
2o or La (NO
3)
36H
2o solution.
Mud rare earth seed-soaking liquid of the present invention, wherein Ce (NO
3)
36H
2the concentration of O earth solution is 200-400 mg.L
-1.La (NO
3)
36H
2the concentration of O earth solution is 100-300 mg.L
-1.
The present invention further discloses mud rare earth seed-soaking liquid and improve the application in salt stress Festuca Arundinacea malonaldehyde, proline and relative conductivity in preparation.
The present invention further discloses the method that adopts mud rare earth mixing seed-soaking liquid to improve the Festuca Arundinacea salt resistance, it is characterized in that being undertaken by following step:
(1) by the mud of fetching, air-dry under field conditions (factors), with 2-4 mm sieve sieve, go the bulk particle standby;
(2) then mud be take after parts by weight are loaded on as 1:2 in container and place 24h in distilled water, filter, obtain required mud leaching liquor;
(3) respectively with distilled water by Ce (NO
3)
36H
2o, La (NO
3)
36H
2o dissolves, and then makes respectively concentration 200-400 mg.L
-1earth solution standby;
Saline-alkali soil is taken from seashore, Huanghua City, Hebei province, and it is 7.84 that salt content is respectively 0.5%, pH, and unit weight is 1.04(g/ml), electrical conductivity is 1.49 * 10
3(μ S/cm); Water-holding capacity is 1.04(ml/g); Total porosity is 64.52(%);
(4) earth solution of above-mentioned mud leaching liquor and variable concentrations is mixed with the ratio of 1:1, obtain mud and rare earth seed-soaking liquid;
(5) get full seed, even tall fescue seed, be put in culture dish, solution seed soaking 24 h by above-mentioned different disposal, spread 100g saline-alkali soil in culture dish, then the tall fescue seed after 0.4g seed soaking is broadcast therein, experimental period 40d, between culture period, laboratory temperature is 24 ~ 30 ℃, relative moisture is 45 ~ 56%, and intensity of illumination is 460 ~ 720 μ mol.m
-2s
-1;
(6) after plant is cultivated 40 d, the neat root of Festuca Arundinacea is cradled, acrial part is clean with distilled water flushing, and blotting paper blots surperficial moisture content, puts into baking oven, and 1 h that completes under 105 ℃ is dried to constant weight for 80 ℃, measures its acrial part dry weight, is considered as biomass.
The more detailed preparation method of the present invention and test situation are as follows:
1 development materials and methods
1.1 experiment material
This is tested mud used and takes from Jizhuangzi Waste Water Treatment Plant, Tianjin, select the common lawn plant of northern China be Festuca Arundinacea (
festuca arundinaceal.).Rare earth element is cerium and lanthanum, adopts triumphant Tonghua, Tianjin to learn the cerous nitrate that reagent Co., Ltd produces, and its molecular formula is: Ce (NO
3)
36H
2the lanthanum nitrate that O and Tianjin, Tianjin fine chemistry industry research institute of section produce, its molecular formula is: La (NO
3)
36H
2o.
Saline-alkali soil is taken from seashore, Huanghua City, Hebei province, and it is 7.84 that salt content is respectively 0.5%, pH, and unit weight is 1.04(g/ml), electrical conductivity is 1.49 * 10
3(μ S/cm); Water-holding capacity is 1.04(ml/g); Total porosity is 64.52(%).
The mud of fetching, air-dry dirt under field conditions (factors), remove the bulk particle with 2 mm sieve sieves.Then with mud: distilled water=1:2.After being loaded in conical flask and placing 24 h, then filter, obtain required mud leaching liquor.With distilled water by Ce (NO
3)
36H
2o and La (NO
3)
36H
2after O dissolves, then the earth solution of above-mentioned mud leaching liquor and variable concentrations is mixed to get to mud and rare earth seed-soaking liquid with the ratio of 1:1.
1.2 experimental design
8 processing are established in experiment altogether, are respectively pure distilled water, pure mud leaching liquor, 200 mg.L
-1cerium+mud leaching liquor, 300 mg.L
-1cerium+mud leaching liquor, 400 mg.L
-1cerium+mud leaching liquor, 200 mg.L
-1lanthanum+mud leaching liquor, 300 mg. L
-1lanthanum+mud leaching liquor, 400 mg.L
-1lanthanum+mud leaching liquor, take distilled water as contrast (CK).Get full seed, even tall fescue seed, be put in culture dish, with solution seed soaking 24 h of above-mentioned different disposal, experiment is to repeat for 3 times.Spread 100g saline-alkali soil in the culture dish that is 9cm at diameter, then the tall fescue seed after 0.4g seed soaking broadcast therein, experimental period 40d, between culture period, laboratory temperature is 24-30 ℃, relative moisture is 45-56%.Intensity of illumination is 460-720 μ mol.m
-2s
-1.
1.3 index determining
1.3.1 the mensuration of plant height and biomass
After plant is cultivated 40 d, the neat root of Festuca Arundinacea is cradled, acrial part is clean with distilled water flushing, and blotting paper blots surperficial moisture content, puts into baking oven, and 1 h that completes under 105 ℃ is dried to constant weight for 80 ℃, measures its acrial part dry weight, is considered as biomass.
1.3.2 the mensuration of chlorophyll content
The mensuration of chlorophyll content adopts acetone-alcohol mixeding liquid method: accurately takes 0.1 g, shreds, put into the little black box of experiment, add acetone-ethanol (1:1) mixed extract 10 mL, and capping plug, at room temperature 24 h are placed in dark place, until material bleaches.Then measure optical density under 663 nm and 645 nm wavelength.According to formula, calculate.
1.3.3 the mensuration of mda content
Take 0.5 g blade, extract constant volume 10 ml, 4000 r.min with 10%TCA
-1centrifugal 10 min, get the 0.6%TBA that liquid 2 ml in upper strata add 2 ml again, 15min in boiling water, and centrifugal 10 min, get supernatant and survey light absorption value under 532 nm and 450 nm.
1.3.4 the mensuration of relative conductivity
Relative conductivity adopts the conductivity meter method to be measured: the deionized water of 10 ml is put into to numbered test tube, measure conductivity value I
0.Each sample takes blade 0.2 g, is cut into 0.5 cm
2fritter be placed in test tube, accurately add deionized water 10 ml, soak 24 h, measure electrical conductivity with DDS-11D direct-reading conductivity gauge and be measured as I
1.After mensuration, test tube is placed on to boiling water bath 0.5 h, kill tissues is surveyed I under room temperature
2.Calculate relative conductivity (%)=(I
1-I
0)/(I
2-I
0) * 100%.
1.3.5 the mensuration of proline content
Take 0.5 g blade, shred, be placed in respectively Boiling tube, then add respectively the sulfosalicylic acid of 10 ml 3%, extracting in boiling water 10 min, cooling rear absorption 2 ml are in another clean test tube with ground stopper, add 2 ml glacial acetic acid and 2 ml acid ninhydrines, in boiling water, heating 30 min, cooling, extract 3000 rmin with 4 ml toluene
-1centrifugal 5 min, get upper strata liquid and survey light absorption value under 520 nm.
1.4 data are processed
Data analysis adopts EXCEL and SPSS17.0 analysis software to be processed.
2 results and analysis
2.1 mud and the seed soaking of the rare earth seed-soaking liquid impact on Festuca Arundinacea biomass under salt stress
Table 1 is the impact of salt stress on the Festuca Arundinacea biomass.As can be seen from the table, the biomass of Festuca Arundinacea with compare, increase to some extent, illustrate that mixed liquor can promote the growth of Festuca Arundinacea to a certain extent.As can be seen from Table 1, mud and rare earth mixed liquor seed soaking, the ground biomass of Festuca Arundinacea is all than the increase to some extent of control group, illustrates that mixed liquor can alleviate the injury of salt stress to Festuca Arundinacea, promotes the increase of its biomass, and then improves its resistance.In fresh weight, for cerium seed soaking, to test during set concentration processes, consumption effect when 200 ceriums+mud leaching liquor is better, than control group, has improved 54.51%.For the lanthanum seed soaking, test in set concentration treatment effect, all than contrast, increase, wherein, in 400 lanthanums+mud leaching liquor best results, than control group, improved 35.76%.
The impact on Festuca Arundinacea ground biomass under salt stress of table 1 mud and rare earth mixed liquor
| Concentration (mgL -1） | Fresh weight (g/ ware) | Dry weight (g/ ware) | Fresh and dried ratio |
| CK | 2.88±0.05b | 0.25±0.02b | 0.09±0.01a |
| Pure mud leaching liquor | 3.20±0.14b | 0.28±0.02ab | 0.09±0.01a |
| 200 ceriums+mud leaching liquor | 4.45±0.18a | 0.37±0.03a | 0.08±0.00a |
| 300 ceriums+mud leaching liquor | 4.34±0.27a | 0.31±0.03ab | 0.07±0.01a |
| 400 ceriums+mud leaching liquor | 4.42±0.29a | 0.33±0.02ab | 0.07±0.01a |
| CK | 2.88±0.05c | 0.25±0.02b | 0.09±0.01ab |
| Pure mud leaching liquor | 3.20±0.14bc | 0.28±0.02ab | 0.09±0.01ab |
| 200 lanthanums+mud leaching liquor | 3.66±0.25ab | 0.27±0.03ab | 0.07±0.01b |
| 300 lanthanums+mud leaching liquor | 3.48±0.15abc | 0.34±0.02a | 0.10±0.01a |
| 400 lanthanums+mud leaching liquor | 3.91±0.33a | 0.33±0.03ab | 0.08±0.00ab |
2.2 mud and the seed soaking of the rare earth seed-soaking liquid impact on Festuca Arundinacea chlorophyll content under salt stress
Chlorophyll content is the important indicator of weighing leaf senile degree and plant photosynthesis organ physiological situation, has reflected to a certain extent the height of photosynthesis of plant intensity.As shown in Table 2, each mud and rare earth seed-soaking liquid seed soaking Festuca Arundinacea chlorophyll a, chlorophyll b, Chlorophyll content all rise, process the green content of inferior lobe for the highest at 300 ceriums+mud leaching liquor and 400 lanthanums+mud leaching liquor, mud and rare earth seed-soaking liquid seed soaking are described, can improve the chlorophyll content of Festuca Arundinacea, promote it to carry out photosynthesis, the accumulation photosynthetic product.
Table 2 mud and the rare earth mixed liquor impact (mgg on Festuca Arundinacea chlorophyll content under salt stress
-1fW)
2.3 mud and the seed soaking of the rare earth seed-soaking liquid impact on Festuca Arundinacea malonaldehyde, proline and relative conductivity under salt stress
In Festuca Arundinacea, the content of proline is generally lower, but, in adverse circumstance, under condition of salt stress, in Festuca Arundinacea, the content of Proline significantly increases, and the accumulation of proline can improve the salt resistance of seedling.As shown in table 3, variable concentrations seed soaking is remarkable on the impact of proline content, with the increase of mud leaching liquor concentration, proline content be first increase after reduction trend, the highest during 300 ceriums+mud leaching liquor soaked seeds concentration, illustrate under this concentration and be subject to salt stress to affect minimum.
Under salt stress, the relative conductivity of the processing Festuca Arundinacea of mud and rare earth seed-soaking liquid all descends, and illustrates that mud and rare earth seed soaking seed-soaking liquid have certain stabilization to the cell membrane of Festuca Arundinacea under salt stress.During concentration for the treatment of 300 ceriums+mud leaching liquor, the relative conductivity of Festuca Arundinacea has reduced by 27.48% than contrast.
The impact on Festuca Arundinacea malonaldehyde, proline and relative conductivity under salt stress of table 3. mud and rare earth mixed liquor
3 development conclusions
This research shows, in fresh weight, for the cerium seed soaking, tests during set concentration processes, and consumption effect when 200 ceriums+mud leaching liquor is better, than control group, has improved 54.51%.For the lanthanum seed soaking, test in set concentration treatment effect, all than contrast, increase, wherein, in 400 lanthanums+mud leaching liquor best results, than control group, improved 35.76%.During relative conductivity concentration for the treatment of 300 ceriums+mud leaching liquor, the relative conductivity of Festuca Arundinacea has reduced by 27.48% than contrast.
Embodiment:
Below in conjunction with specific embodiment, the present invention will be further described, and following each embodiment is not only limitation of the present invention for the present invention is described.
Embodiment 1
A kind of mud rare earth seed-soaking liquid, mud leaching liquor and earth solution that it is 1:1 by parts by weight form; Wherein said mud leaching liquor refers to mud: the ratio of weight and number of distilled water is to place 24h after 1:2 mixes to filter, and obtains required mud leaching liquor; Earth solution refers to Ce (NO
3)
36H
2o or La (NO
3)
36H
2the O aqueous solution.
Ce (NO wherein
3)
36H
2the concentration of O earth solution is 200,300,400 mg.L
-1.
La (NO
3)
36H
2the concentration of O earth solution is 200,300,400 mg.L
-1.
Method:
(1) by the mud of fetching, air-dry under field conditions (factors), with 4 mm sieve sieves, go the bulk particle standby;
(2) then mud be take after parts by weight are loaded on as 1:2 in container and place 24h in distilled water, filter, obtain required mud leaching liquor;
(3) respectively with distilled water by Ce (NO
3)
36H
2o, La (NO
3)
36H
2o dissolves, and then makes respectively concentration 200-400 mg.L
-1earth solution standby; Saline-alkali soil is taken from seashore, Huanghua City, Hebei province, and it is 7.84 that salt content is respectively 0.5%, pH, and unit weight is 1.04(g/ml), electrical conductivity is 1.49 * 10
3(μ S/cm); Water-holding capacity is 1.04(ml/g); Total porosity is 64.52(%);
(4) earth solution of above-mentioned mud leaching liquor and variable concentrations is mixed with the ratio of 1:1, obtain mud and rare earth seed-soaking liquid;
(5) get full seed, even tall fescue seed, be put in culture dish, with solution seed soaking 24 h of above-mentioned different disposal, experiment is to repeat for 3 times.Spread 100g saline-alkali soil in culture dish, then the tall fescue seed after 0.4g seed soaking broadcast therein, experimental period 40d, between culture period, laboratory temperature is 28 ℃, relative moisture is 45%.Intensity of illumination is 500 μ mol.m
-2s
-1;
(6) after plant is cultivated 40 d, the neat root of Festuca Arundinacea is cradled, acrial part is clean with distilled water flushing, and blotting paper blots surperficial moisture content, puts into baking oven, and 1 h that completes under 105 ℃ is dried to constant weight for 80 ℃, measures its acrial part dry weight, is considered as biomass.
Claims (5)
1. a mud rare earth seed-soaking liquid, is characterized in that mud leaching liquor and earth solution that it is 1:1 by parts by weight form; Wherein said mud leaching liquor refers to mud: the ratio of weight and number of distilled water is to place 24h after 1:2 mixes to filter, and obtains required mud leaching liquor; Earth solution refers to Ce (NO
3)
36H
2o or La (NO
3)
36H
2the O aqueous solution.
2. mud rare earth seed-soaking liquid claimed in claim 1, wherein Ce (NO
3)
36H
2the concentration of O earth solution is 200-400 mg.L
-1.
3. mud rare earth seed-soaking liquid claimed in claim 1, wherein La (NO
3)
36H
2the concentration of O earth solution is 200-400 mg.L
-1.
4. the described mud rare earth of claim 1 seed-soaking liquid improves the application in salt stress Festuca Arundinacea malonaldehyde, proline and relative conductivity in preparation.
5. a method that adopts mud rare earth mixing seed-soaking liquid to improve the Festuca Arundinacea salt resistance is characterized in that being undertaken by following step:
(1) by the mud of fetching, air-dry under field conditions (factors), with 2-4 mm sieve sieve, go the bulk particle standby;
(2) then mud be take after parts by weight are loaded on as 1:2 in container and place 24h in distilled water, filter, obtain required mud leaching liquor;
(3) respectively with distilled water by Ce (NO
3)
36H
2o, La (NO
3)
36H
2o dissolves, and then makes respectively concentration 200-400 mg.L
-1 'searth solution is standby; Saline-alkali soil is taken from seashore, Huanghua City, Hebei province, and it is 7.84 that salt content is respectively 0.5%, pH, and unit weight is 1.04(g/ml), electrical conductivity is 1.49 * 10
3(μ S/cm); Water-holding capacity is 1.04(ml/g); Total porosity is 64.52(%);
(4) earth solution of above-mentioned mud leaching liquor and variable concentrations is mixed with the ratio of 1:1, obtain mud and rare earth seed-soaking liquid;
(5) get full seed, uniform tall fescue seed; be put in culture dish; solution seed soaking 24 h by above-mentioned different disposal; spread 100g saline-alkali soil in culture dish; then the tall fescue seed after the 0.4g seed soaking is broadcast therein; experimental period 40d, between culture period, laboratory temperature is 24 ~ 30 ℃, relative moisture is 45 ~ 56%; Intensity of illumination is 460 ~ 720 μ mol.m
-2s
-1;
(6) after plant is cultivated 40 d, the neat root of Festuca Arundinacea is cradled, acrial part is clean with distilled water flushing, and blotting paper blots surperficial moisture content, puts into baking oven, and 1 h that completes under 105 ℃ is dried to constant weight for 80 ℃, measures its acrial part dry weight, is considered as biomass.
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| CN103270868B (en) | 2015-04-22 |
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