2501 results about "Alkali soil" patented technology

The invention discloses a microbial compound bacterial fertilizer for improving saline alkali soil and increasing the acting yield. A preparation method of the microbial compound bacterial fertilizer comprises the following steps: preparing a microbial agent containing phosphate-solubilizing bacteria, potassium-solubilizing bacteria, nitrogen-fixing bacteria, bacillus subtilis and actinomycetes; the preparation method comprises the following steps: preparing a sodium alginate solution, adding nano-hydroxyapatite and a microbial agent, uniformly mixing, dropwise adding a calcium chloride solution, and embedding an inner layer to obtain microbial embedded particles; uniformly mixing biochar, humic acid and attapulgite, taking a 2-3% HPMC solution as a binder, and carrying out middle-layer coating, so as to obtain prefabricated microbial fertilizer particles; and coating the chitosan-sodium alginate-nano ZnO outer layer to obtain the microbial compound bacterial fertilizer. The microbial compound bacterial fertilizer disclosed by the invention adopts a multi-layer and multifunctional collaborative design concept, realizes efficient protection and slow release of functional microorganisms in a saline-alkali environment, remarkably improves the physicochemical properties of soil and promotes the growth of crops.

The invention provides a saline-alkali soil improvement method and system based on Internet of Things big data analysis, and the method comprises the steps: collecting a target saline-alkali soil sample, and obtaining an improvement target and a preset improvement scheme through sample analysis and a knowledge base; randomly selecting a plurality of different types of areas, and setting sensor nodes for layered sampling; monitoring the change of the salt content and the PH value of the soil and the crop growth condition through a monitoring system; dynamically adjusting a sampling time interval; a comprehensive evaluation model is established, an improvement scheme is adjusted according to the soil salt content change value, the PH value change value and the change value of the evaluation model, and the system comprises a sampling node setting module, a sampling module and a model establishment and improvement scheme adjustment module; through the method and the system, the data volume is reduced as much as possible and the monitoring efficiency is improved on the premise of accurately setting the sampling nodes, accurately sampling and accurately and comprehensively monitoring the condition of the saline-alkali soil, and meanwhile, a monitoring model is provided to comprehensively evaluate the evaluation and improvement effect.

The invention relates to the technical field of saline-alkali soil improvement, in particular to an intelligent irrigation and soil conditioning system for saline-alkali soil improvement, which comprises a climate prediction module, a soil detection module, an electrochemical salt migration prediction module, a data analysis module, an irrigation execution module and a data feedback module, the climate prediction module predicts future climate conditions; the soil detection module monitors soil parameters of the saline-alkali land in real time; the electrochemical salt migration prediction module is used for predicting the migration behavior of salt in soil; the data analysis module formulates irrigation and soil conditioning strategies; the irrigation execution module controls operation of irrigation equipment; and the data feedback module feeds back the irrigation execution result and the actual soil improvement effect, and continuously optimizes irrigation and soil conditioning strategies. According to the method, efficient utilization of resources is achieved, and the accuracy and scientificity of saline-alkali soil improvement are ensured.

The invention discloses a saline-alkali soil dynamic precise irrigation method based on a water-salt-carbon flux coupling model, and relates to the technical field of saline-alkali soil improvement and precise irrigation, and the method comprises the following steps: dividing soil into a surface layer, a middle layer and a deep layer, building the coupling model based on a Darcy law, a convection-dispersion equation and a first-order dynamic model, and simulating a water-salt-carbon flux dynamic state; collecting data such as soil water content, conductivity and organic carbon content through a layered sensor network, and inputting the data into the model after cleaning and fusing; the irrigation time, the irrigation amount and the water quality are optimized through a genetic algorithm in combination with the crop growth period requirements; irrigation is executed through an intelligent valve and a variable frequency water pump, and model parameters are adjusted based on real-time monitoring feedback. According to the method, multi-element cooperative regulation and control of saline-alkali soil irrigation are achieved, the soil ecological process can be accurately simulated, the water resource utilization efficiency is improved, the soil environment is improved, and crop yield increase is promoted.

According to the coastal saline-alkali land underground water level adjusting system based on real-time monitoring and intelligent regulation and control, the system integrates the soil salinity sensor, the underground water level sensor and the central processing unit, future trend prediction is carried out by monitoring key parameters such as soil salinity and underground water level in real time in combination with a deep learning model, and the real-time monitoring and intelligent regulation and control are achieved. And precise intelligent regulation and control are realized. The system can effectively reduce soil salinization, prevent seawater from flowing backwards, improve the utilization efficiency of water resources and reduce the labor management cost at the same time. The method is characterized in that the application of multi-parameter comprehensive monitoring, a deep learning prediction model and a self-adaptive intelligent regulation and control algorithm provides a new technical solution for coastal saline-alkali land treatment.

The invention discloses an integrated measurement method and system for hydrological elements in a high-salinity and high-sand environment, and relates to the technical field of hydrological monitoring, and the method comprises the steps: correcting the theoretical signal receiving strength of each sonar through an established sound attenuation model, and then calculating an effective signal-to-noise ratio, thereby achieving the measurement of the underwater topography in the high-salinity and high-sand environment. According to the method, a dynamic weight fusion algorithm is adopted to perform data fusion on the water depth data of each sonar to obtain fused water depth data, and an inversion method based on residual error minimization is adopted to perform iterative optimization on model parameters, so that the accuracy is relatively high. When the water velocity and the flow rate are measured in the high-salt and high-sand environment, iterative decoupling is carried out based on the sediment particle motion comprehensive model to obtain the sediment particle velocity, then the water velocity is updated based on the measured apparent velocity and the difference value, and after the updated water velocity is converged, the flow rate is calculated. And the accurate water flow rate can be calculated by combining the flow cross section area. The measurement precision of the unmanned ship on the hydrological elements in the saline-alkali area can be improved.

The invention discloses a layered alternate fertilization method suitable for saline-alkali soil improvement. The method comprises the following steps: determining the soil salinization degree and the main salt ion type of target saline-alkali soil; the method comprises the following steps: designing a layered fertilization scheme according to the soil salinization degree, the main salt ion type and the growth demand and salt tolerance of a target crop, and determining the fertilization types, fertilization amounts and fertilization depths of different soil layers; formulating an alternate fertilization strategy, and determining fertilization periods and the sequence and interval time of fertilization of different soil layers in each period; fertilization operation is carried out on the target saline-alkali soil according to a layered fertilization scheme and an alternate fertilization strategy, the dynamic change of soil salinity and the growth condition of target crops are monitored in the fertilization process, and the follow-up fertilization scheme and strategy are adjusted in time according to the monitoring result. Soil conditions are determined, a layered fertilization scheme is designed, an alternate fertilization strategy is formulated, fertilization operation is adjusted according to monitoring results, and the purposes of improving saline-alkali soil and meeting the growth requirements of target crops are achieved.

The invention discloses bacillus cereus and application thereof, and belongs to the technical field of microorganisms. The bacillus cereus SNF7 is separated from a saline-alkali soil sample, has the functions of resisting salt, fixing nitrogen and promoting growth, has an obvious inhibition effect on some common soil-borne diseases in agriculture, such as pathogenic bacteria of peanut fruit rot, tomato root rot and the like, has multiple functions of resisting salt, fixing nitrogen, biologically preventing and controlling and the like, and has a wide application prospect. The method can be widely applied to crop planting in large saline-alkali soil in China.

The invention discloses a planting optimization method and system based on crop yield estimation in a saline-alkali land area, and relates to the field of crop yield prediction and planting optimization, and the method comprises the steps: data collection and fusion processing; performing dynamic prediction on soil water and salt migration, and realizing water and salt space-time distribution prediction by adopting a space-time cubic modeling self-adaptive model combined with physical correction; crop salt tolerance modeling: establishing a multi-interval salt tolerance model based on physiological response fitting and threshold segmentation, and introducing covariable correction; carrying out migration salt tolerance coupling modeling, introducing a salinity memory factor and a stage sensitivity regulation factor, and dynamically simulating growth response of crops under salinity stress; and crop yield estimation and planting optimization: generating a regional yield prediction and sowing configuration scheme based on coupling model output, and forming an optimization strategy in combination with measures such as irrigation and fertilization. According to the method, model-driven integrated optimization from yield estimation to planting decision of crops in the saline-alkali region is realized, and the method has high precision and wide applicability.

The invention relates to the technical field of data twinning, in particular to a saline-alkali soil water-salt motion simulation method based on big data analysis. The method comprises the following steps: collecting saline-alkali soil multi-source monitoring data; based on the saline-alkali soil multi-source monitoring data, salt soil layer correlation feature analysis and water-salt driving factor coupling feature analysis are carried out, and salt soil layer correlation feature data and water-salt driving factor coupling feature data are obtained; simulation relation model design of saline-alkali soil water-salt movement is carried out through the saline-alkali soil level correlation feature data and the water-salt driving factor coupling feature data, and a saline-alkali soil water-salt movement simulation model is generated; based on the saline-alkali soil water-salt motion simulation model, designing saline-alkali soil farmland irrigation simulation parameters; and carrying out water-salt motion simulation prediction and feedback of the saline-alkali soil farmland irrigation on the saline-alkali soil farmland irrigation simulation parameters. According to the saline-alkali soil water-salt motion simulation analysis method, multi-driving-factor fusion and accurate spatial heterogeneity description are achieved.

The invention discloses a soil water and salt dynamic monitoring and quality evaluation method based on multispectral remote sensing, and relates to the field of geological monitoring, and the method comprises the steps: carrying out the scattering deviation correction and roughness correction of an observation spectrum through a satellite remote sensing image, an unmanned aerial vehicle multispectral image, a ground sample and meteorological driving data; the soil intrinsic reflectivity, the vegetation coverage component and the salt crusting component are obtained; a water-salt inversion model is established by combining thermal infrared and red edge wave band information, and multi-temporal soil volumetric moisture content and surface salinity index are inverted; by introducing meteorological conditions and vegetation dynamic characteristics, a water-salt coupling partial differential equation and a graph space-time constraint model are constructed, and continuous space-time distribution of soil water content and salinity is obtained; extracting salinity, moisture, vegetation response and soil health indexes, establishing a soil quality comprehensive evaluation model, and outputting high-risk plaques and a treatment priority sequence. The method realizes dynamic monitoring and quality grading evaluation of soil water and salt, and is suitable for saline-alkali soil treatment and ecological restoration.

The invention relates to the technical field of saline-alkali soil improvement. The invention provides an extremely severe saline-alkali soil improvement method which comprises the following steps: (1) ploughing soil to be improved, ditching, and spreading a material A into ditches; (2) irrigation is carried out after crops are sown in the ditches, and field management is carried out in the crop growth period; (3) after crops are harvested, crop straw is smashed and subjected to rotary tillage into soil; and (4) repeating the steps (1)-(3), and carrying out continuous soil improvement treatment. According to the technical scheme, the soil structure and the microbial environment are improved through soil preparation and fertilization before sowing, the salt content of soil of a plough layer is reduced through a salt reducing measure, soil osmotic pressure is reduced, and the salt content of the soil is continuously reduced through a crop planting measure. According to the scheme, the soil saline-alkali improvement effect is good, a good soil environment is created for seed budding and seedling emergence stages, and the seed emergence rate is increased.

The invention provides a monitoring data optimization method for saline-alkali soil improvement equipment, and the method comprises the following steps: S1, collecting salinity concentration data through the saline-alkali soil improvement equipment, setting an advancing path and data collection frequency of the saline-alkali soil improvement equipment, carrying out the saline-alkali soil salinity data collection once every advancing preset distance, the position information and the time information of the data and the monitoring data of the salinity concentration sensor are recorded; s2, performing anomaly detection optimization on the collected salinity concentration data; and S3, storing and uploading the screened effective data. The invention relates to the technical field of data processing, solves the problem of misjudgment of a traditional COF algorithm in a saline-alkali land junction area through fusion of spatial junction evaluation and historical trend analysis, remarkably improves data anomaly detection precision, and provides efficient and reliable technical support for accurate improvement of saline-alkali land.

The invention discloses a cold region saline-alkali soil rice growth assessment method and system based on image data fusion, and relates to the technical field of rice growth monitoring. According to the main technical scheme, the method comprises the steps of obtaining multi-source fusion image data, environment monitoring data and actually measured growth indexes corresponding to different growth stages of rice in a cold region saline-alkali soil region in a historical period; performing deep feature extraction on the multi-source fusion image data to obtain key image features; performing deep feature extraction on the environment monitoring data to obtain key environment features; and respectively processing the key image features and the key environment features corresponding to different growth stages in a historical period by using an attention mechanism, and constructing a growth evaluation model corresponding to the rice in the cold region saline-alkali soil region based on the processed key image features, the processed key environment features and actually measured growth indexes. The main purpose is to improve the accuracy of rice growth evaluation of the cold region saline-alkali soil.

The invention relates to the technical field of saline-alkali soil improvement, in particular to a saline-alkali soil treatment and improvement method which comprises the following steps: S1, early-stage investigation and planning; s2, physical improvement; s3, chemical improvement; s4, biological improvement; s5, irrigation improvement; s6, later monitoring and maintenance; according to the saline-alkali soil treatment and improvement method, a traditional single improvement mode is broken through, physical, chemical, biological and engineering technologies are fused, a systematic improvement scheme is formed, and physical improvement effectively improves the soil structure and accelerates salt discharge through land leveling, deep ploughing, upturned soil sunning and concealed pipe laying for drainage; a soil conditioner and an acidic material are precisely applied for chemical improvement, and the soil acidity and alkalinity and ion composition are adjusted; in biological improvement, salt is absorbed by virtue of salt-tolerant plants and microbial agents, and soil microbial communities are improved; a fresh water resource or salt water desalination technology is reasonably utilized for irrigation improvement, and salt leaching and water resource recycling are achieved; through the synergistic effect of multiple means, the salt content of soil can be more efficiently reduced, and the soil structure is improved.

The invention relates to the technical field of soil conditioners, and particularly discloses an intelligent controlled-release core-shell alginate soil conditioner and a preparation method thereof.The conditioner is of a core-shell-layer three-layer structure and comprises a core layer, a middle shell layer and an outer layer, the three layers account for 30%, 40% and 30% of the total weight respectively, and the core layer mainly comprises improved alginate and nutrients; the middle shell layer mainly comprises chitosan and a microbial preparation; and the outer layer mainly comprises modified charcoal and magnetic nano # imgabs0 #. The preparation method comprises the four steps of core layer preparation, middle shell layer coating, outer layer coating and forming post-treatment, and multiple functions of accurate nutrient supply, efficient heavy metal fixation and soil microenvironment regulation and control are achieved through a core-shell-layer three-layer structure design and a pH / temperature / microorganism triple response mechanism by adopting a coaxial electronic injection and layer-by-layer self-assembly technology; the fertilizer has a remarkable improvement effect on sandy soil and saline-alkali soil, and the organic matter increasing rate reaches 40%.

The invention provides a saline-alkali soil distribution remote sensing extraction method and device based on a self-adaptive time window, which are applied to the technical field of remote sensing, and the method comprises the steps: obtaining a preprocessed time sequence remote sensing image of a target crop; extracting a farmland parcel in the time sequence remote sensing image to obtain a field parcel area; in the minimum continuous observation times of the growth cycle of the target crop, when the pixel categories of the field area are all bare soil, determining a time period between the minimum continuous observation times as a saline-alkali soil extraction window period of the field area; extracting a target time sequence remote sensing image of each saline-alkali land in the field area in a window period, and synthesizing based on a remote sensing index value of the target time sequence remote sensing image according to a weighted average method to obtain a self-adaptive bare soil image; determining a salt-alkali comprehensive index of the adaptive bare soil image based on a plurality of remote sensing indexes through a principal component analysis method; through the method, the saline-alkali soil distribution range can be accurately extracted.

The invention relates to the field of saline-alkali soil remediation, and particularly discloses a saline-alkali soil improvement and remediation method which comprises the following steps: step 1, soil pretreatment: performing deep scarification operation on saline-alkali soil at the depth of 40-60cm, and applying desulfurized gypsum particles with the particle size of less than or equal to 5mm at the dosage of 3-5t / ha; step 2, paving a biochar-based composite material: mixing biochar, humic acid and nano-hydroxyapatite according to a mass ratio of 4: 1: 0.5 to form composite particles with the particle size of less than or equal to 2mm, and burying the composite particles into soil in a layered manner according to the dosage of 8-12t / ha; through physical and chemical regulation and control of the biochar-based composite material, biological metabolism activation of the composite microbial agent and dynamic optimization of intelligent water and salt management, a cascade remediation system of material salt resistance-microbial soil improvement-plant salt absorption is constructed, all technical modules are mutually coupled, the salt reduction efficiency is remarkably improved, and the comprehensive utilization rate of the biochar-based composite material is increased. Meanwhile, the soil nutrient circulation capacity is enhanced, and the problems that a traditional single technology is limited in action range and long in remediation period are solved.

The invention relates to the technical field of coal gangue treatment, in particular to a soil conditioner based on coal gangue and application of the soil conditioner. The soil conditioner is prepared by the following steps: putting calcined and modified coal gangue into domestic sewage, adsorbing organic matters, mineral nutrient elements and microorganisms in the sewage into a coal gangue material through domestic sewage reinforcement treatment, and then carrying out standing and aging treatment to change a microbial community structure in the coal gangue, so that the soil conditioner is prepared. The bio-availability of organic matters and mineral nutrient elements in the gangue is improved, and standing and aging are performed for 15-45 days to obtain the soil conditioner. The soil conditioner provided by the invention is rich in nitrogen, phosphorus, potassium, organic matters and abundant microbial communities, the saline-alkali soil quality can be improved by applying the soil conditioner provided by the invention to saline-alkali soil, the crop germination rate and biomass are further improved, and the goal of integrating ecological gradient utilization of coal gangue and saline-alkali soil improvement is achieved.

The invention discloses a system for saline-alkali land farmland soil water and salt detection and drought and flood disaster early warning. According to the method, spectral information is extracted through a remote sensing image or an unmanned aerial vehicle image, and a salinity spectral index and a moisture spectral index are constructed. Meanwhile, the water content and the salt content of the soil at different depths are collected. Key spectrum variables are screened through an RXGBoost model, a salinity-moisture coupling relationship is synchronously calculated through a single model, and an independent calibration link is reduced for a calibration process. According to the method, a comprehensive and modular technical method and a solution are applied for the first time, maximum application of limited information is realized, and the technical requirements of efficient utilization, monitoring and management of irrigation water are met; and difficult points and key points coexist. Through deep coupling of theoretical innovation and system design, the system is realized in the field of saline-alkali soil irrigation: single data monitoring is transited to a multidisciplinary collaborative ecological hydrological theoretical system, a recessive water-salt interaction process is converted into modelable and controllable dominant decision parameters, and a systematic solution is provided for efficient utilization of saline-alkali soil agricultural resources.

The invention discloses a potassium fulvate chelated macroelement water-soluble fertilizer with stress resistance and growth promotion functions, and relates to the technical field of water-soluble fertilizers, the potassium fulvate chelated macroelement water-soluble fertilizer comprises the following raw materials by weight: 167-210 parts of mineral source potassium fulvate, 450-460 parts of potassium nitrate, 300-310 parts of urea, 150-160 parts of potassium dihydrogen phosphate, 30-40 parts of potassium sulfate, 15-25 parts of EDTA-disodium, and 5-15 parts of citric acid. 0.5 to 1.5 parts of brassinolide and 4 to 6 parts of polyaspartic acid; according to the potassium fulvate chelated macroelement water-soluble fertilizer with the stress-resistant and growth-promoting functions, through chelation cooperation of potassium fulvate and nitrogen, phosphorus and potassium, the solubility of the chelated phosphorus element in water is increased, and the chelated phosphorus element can be more uniformly distributed in soil; by adopting an EDTA-disodium and citric acid composite chelating system, volatilization and loss of nitrogen elements are reduced, the problem of precipitation of calcium, magnesium and phosphorus is solved, and the soil conditioner is suitable for hard water areas and especially has outstanding performance in saline-alkali soil and arid areas.

The invention provides a saline-alkali soil dry sowing pressing sowing yield increasing method, and belongs to the technical field of agricultural planting, and the method comprises the following steps: S1, seed treatment; s2, land consolidation; s3, sowing the seeds; and S4, pressing. According to the dry sowing, pressing and sowing yield increasing method for the saline-alkali soil, all links including seed treatment, land consolidation, sowing, pressing and the like are finely designed and optimally combined, special soil conditions and crop growth requirements of the saline-alkali soil are fully considered, and the germination rate of seeds, the survival rate of seedlings and the yield of crops can be remarkably increased; an efficient and feasible technical scheme is provided for agricultural development and utilization of the saline-alkali soil, and the method has wide application prospects and popularization value.

The invention belongs to the technical field of agriculture, and particularly provides a compound microbial agent and application thereof. The compound microbial agent is prepared from bacillus velezensis RKN1111, bacillus subtilis N-3 and paenibacillus mucilaginosus HX-02, and the compound microbial agent is prepared from bacillus velezensis RKN1111, bacillus subtilis N-3 and paenibacillus mucilaginosus HX-02, and the compound microbial agent is prepared from bacillus velezensis RKN1111, bacillus subtilis N-3 and paenibacillus mucilaginosus HX-02. The compound microbial agent can effectively improve the pH and EC of saline alkali soil, increase the content of alkali-hydrolyzable nitrogen, available phosphorus and quick-acting potassium in the soil, and play a significant role in increasing the plant height, stem diameter, chlorophyll content and aboveground biomass of corn plants in coastal saline-alkali soil.

The invention discloses a saline-alkali soil improver and a use method thereof, and belongs to the technical field of soil improvement. The modifier comprises the following components in parts by mass: 60-80 parts of an organic carrier, 10-20 parts of an inorganic calcium material, 5-9 parts of a compound microbial agent, 10-20 parts of a sustained-release material, 5-10 parts of an acidity regulator and 15-23 parts of a plant growth promoter. The preparation method comprises the following steps: crushing the raw materials, embedding the sustained-release microspheres, loading the microbial inoculum, and granulating and drying. Through cooperation of multiple mechanisms such as calcium and sodium replacement, pH reduction by organic acid and aggregate formation promotion by microorganisms, differential application strategies are designed for light, medium and severe saline-alkali soil, salt-tolerant crop planting is matched, the yield of wheat, alfalfa and the like is increased by 18%-30%, the soil organic matter is increased to 2.1%, and the microbial diversity index is increased by 133%. The method has the advantages of long-acting salt control, ecological restoration and cost, and is suitable for treatment of coastal and inland saline-alkali soil.

The invention discloses an intelligent control method and system for saline-alkali soil slow-release fertilizer application, and the method comprises the steps: analyzing the space-time trend of soil salinity change and pH dynamic change through a convolutional neural network, judging the matching demand of the fertilizer release rate, and generating a target release curve; the method comprises the following steps: extracting a high-activity strain adapting to a high-salt environment from a salt-tolerant microbial library through a high-throughput screening algorithm, and determining optimal release time interval distribution of strain function activation by combining with the release characteristic of a dynamic release coated fertilizer; if the soil salinity change exceeds a preset threshold value, sensor monitoring data and a target release curve are integrated through a closed-loop control system, and an optimized fertilization amount scheme is obtained; a deep learning model is adopted to analyze the relation between the optimized fertilization amount scheme and soil deep salt distribution, the parameter requirement of depth accurate regulation and control is judged, and a layered fertilization depth control strategy is generated. Through real-time feedback and optimization iteration, accurate improvement and sustainable nutrient management of the saline-alkali soil are realized.

The invention relates to a cultivation nutrient medium and a preparation method thereof. According to the nutrient medium, peat is completely abandoned, the coco coir, the straw and the biochar are combined to reduce ecological burden, the nutrient medium is an environment-friendly medium, the biochar fixes carbon and reduces emission, and the soil structure can be improved after long-term use; vermiculite improves the water-holding capacity, perlite and straw form a stable pore structure, and the ventilation porosity reaches 25% or above. Wormcast and a microbial agent synergistically release nitrogen, phosphorus and potassium, and the fertilizer efficiency is lasting. The microbial agent can inhibit soil-borne diseases such as fusarium and reduce the death rate of cultivated seedlings. The biochar adsorbs salt and toxins, and the EC value is stabilized at 1.2-1.8 mS / cm. The cost of the selected raw materials is reduced by 35% compared with that of a traditional substrate, and the substrate is suitable for large-scale production, suitable for vegetable seedling culture, potted flowers, organic farms and soilless culture systems, and especially suitable for saline-alkali soil or continuous cropping obstacle areas.

The invention relates to a soil conditioner for saline-alkali land treatment and a preparation method, and belongs to the technical field of soil conditioners. The soil conditioner for saline-alkali land treatment is prepared from a fermented fertilizer, biomass charcoal II, corn straw powder, attapulgite powder, humic acid and a compound microbial agent. The soil conditioner disclosed by the invention can be used for reducing the pH value of soil, reducing salinity, promoting the recovery of organic matters and improving the fertility of the soil, and is beneficial to improving the yield of crops.

The invention provides a salt-tolerant plant constructed wetland system for treating eutrophicated mariculture wastewater, which specifically comprises a lower filler formed by mineral materials, and a middle filler formed by modified zeolite, sodium alginate coated vermiculite, rice husk charcoal, oyster shell, coral sand and diatomite, the surface filler is composed of intertidal zone bottom mud, intertidal zone raw water, coastal saline-alkali soil and composite algae powder, and the three fillers are combined with salt-tolerant plant breeding, bow-shaped water flow optimization and layered collaborative design; the core problems of poor salt tolerance, low adsorption efficiency, easiness in blockage, high maintenance cost and the like of the traditional constructed wetland during treatment of the mariculture wastewater are systematically solved.

The invention provides a material for removing sodium ions in saline-alkali soil and a preparation method, and relates to the field of sodium ion adsorbents, the preparation method comprises the following steps: (1) lignin modification: under a water bath condition, dissolving sulfate lignin in a mixed solution of analytically pure acetic acid and 30% hydrogen peroxide, then adding ferric chloride, reacting for 1.5-2.5 hours, diluting with distilled water by 7-8 times, centrifuging and washing to obtain modified lignin; drying to obtain oxidized lignin; (2) hydrogel synthesis: mixing and stirring the oxidized lignin and analytically pure acrylic acid, adding a cross-linking agent and an initiator, and reacting in a drying oven at 65-75 DEG C for 1.5-2.5 hours to form a sodium ion adsorption material with a porous interpenetrating network structure; by modifying the lignin, particularly introducing more hydroxyl and carboxyl groups, the performance of the lignin in the application of adsorbing ions, preparing hydrogel and the like can be improved.

The invention belongs to the technical field of rhizosphere microorganisms, and provides a strain of saline-alkali tolerant rhizosphere growth promoting serratia marcescens and application of the strain of saline-alkali tolerant rhizosphere growth promoting serratia marcescens in growth promoting and repairing of saline-alkali soil. The strain not only grows fast, but also has growth promoting functions such as nitrogen fixation, phosphorus solubilization and potassium solubilization. The strain is preserved in the China General Microbiological Culture Collection Center on March 11, 2025, called CGMCC for short, the address is No.3, Yard 1, Beichen West Road, Chaoyang District, Beijing, and the biological preservation number of the strain is CGMCC NO.33793. The SP-38 strain has multiple growth promoting functions, and through salt stress water culture tests and in-situ saline-alkali soil pot tests of corn, the strain has good effects in the aspects of improving the crop yield and repairing saline-alkali soil.