149 results about "Eutrophication" patented technology

The invention relates to the technical field of aquaculture, and particularly discloses paracoccus pantotrophus P.p-O8 and application of the paracoccus pantotrophus P.p-O8, the paracoccus pantotrophus P.p-O8 is preserved in the China General Microbiological Culture Collection Center (CGMCC), and the preservation number of the paracoccus pantotrophus P.p-O8 is CGMCC NO.26522. The invention relates to a microbial inoculum prepared from paracoccus pantotrophus P.p-O8. The method has a huge application prospect in improving the quality of aquaculture water and repairing the polluted sediments in the cage culture area, improves the water environment quality and the survival conditions of aquaculture organisms, repairs the eutrophicated polluted ecological environment, and has high environmental protection value and economic benefit.

The invention relates to the technical field of water treatment filter materials, in particular to an intelligent clean gradient composite water purification filter element and a preparation method thereof. The filter element adopts an integrated design of'natural gradient base material + ZIF-67 function enhancement + fluorescence-ultrasonic intelligent regeneration ': modified vegetable sponge is used as a porous support layer, a silica gel / ZIF-67 composite gradient layer is constructed on the porous support layer to realize adsorption and antibacterial dual functions, and dopamine-aluminum ions are used for composite surface modification to enhance hydrophilicity and interlayer binding force; a matched automatic system senses pollution in real time through the fluorescence monitoring module and triggers the ultrasonic regeneration module to complete self-cleaning, and the flux recovery rate is larger than or equal to 97.5%; the interception rate of the filtering element to anabaena under the operation pressure of 0.1-0.3 MPa is larger than or equal to 99.2%, the filtering flux is increased by 6-8 times compared with that of a commercial element, the filtering element can tolerate complex water quality in the coexistence of drugs and personal care products, natural vegetable sponge serves as a base material, and the filtering element has the advantages of biocompatibility and low cost and is suitable for drinking water purification and eutrophication water body treatment.

The invention relates to the technical field of forest fertilization, in particular to a forest precise fertilization decision-making method and system based on soil nutrient profit and loss, and the method comprises the steps: obtaining basic information of a target forest land, and dividing forest growth stages based on the basic information; the method comprises the following steps: collecting an undisturbed soil sample and a mixed soil sample of a 0-40cm soil layer of a target forest land by adopting an S-shaped point distribution method, separating the mixed soil sample, and respectively measuring the soil nutrient content, the bioavailability, the soil enzyme activity and the microbial functional gene. According to the method, by measuring the dimension indexes, constructing a five-dimensional profit and loss evaluation index system for determining the reference value and dynamically adjusting the weight according to the forest land data, calculating the comprehensive profit and loss index, judging the nutrient state and generating the personalized fertilization scheme, the defects that an existing fertilization scheme is single in basis index and lacks an effective dynamic adjustment link are effectively overcome; the requirements of multi-generation continuous planting forest land are met, and the environmental risks such as fertilizer waste, soil acidification and water eutrophication are effectively reduced.

The invention discloses a method for determining a toughness and catastrophe threshold value of a functional group of a water ecosystem, and relates to the technical field of water environment ecological engineering.The method comprises the steps that the state of a target water ecosystem is determined according to the total nitrogen content, the total phosphorus content and the chlorophyll content of a water body in the target water ecosystem, the state of the target water ecosystem is eutrophication or non-eutrophication; determining the biomass of phytoplankton based on the target water ecosystem state; utilizing an Ecopath model to construct a static food network relation model of the target water ecosystem; based on the target water ecosystem state, the biomass of the phytoplankton and the static food network relation model, determining a toughness threshold value and a catastrophe threshold value of the biomass of each functional group; each functional group is a plurality of groups for dividing species in the target water ecosystem. According to the method, the water ecosystem functional group toughness threshold value and the catastrophe threshold value which are simple to operate and high in accuracy can be provided.

The invention relates to the technical field of environment management, in particular to an intelligent aquatic plant community optimization system which comprises a community recognition module, an adaptive screening module, a spacing adjustment module, a growth monitoring module and a response regulation and control module. According to the invention, through dynamic monitoring of plant growth states and optimization treatment of spatial configuration, accurate management of aquatic plant communities is realized, the matching degree of plant species and environmental conditions is enhanced, spacing and density configuration of plant planting are improved, resource competition among plants is effectively dealt with, and the yield of aquatic plants is improved. Through multi-dimensional plant growth state feedback and nutrition state monitoring, the plant configuration is adjusted in real time, so that the dynamic management of the community is more flexible, the singleness of the community structure is avoided, and effective intervention is performed aiming at the water eutrophication problem. The adaptability and growth quality of the plants are improved, overgrowth or decline of the plants in an unsuitable environment is avoided, and ecological restoration and water health are promoted.

The invention relates to the technical field of simulation laboratories, and discloses a multifunctional laboratory capable of simulating different marine environments based on ship body carrying, which comprises a ship body capable of simulating different marine environments and manufacturing various controllable flow fields from laminar flow to turbulent flow in an experiment cabin through a controllable flow field generation unit; through the controllable wave generation unit, waves with specified wave heights and periods can be generated in the experiment module; the water body temperature and salinity regulation and control unit is used for quickly and accurately regulating the temperature and salinity of the water body in the experiment module; water bodies with different turbidity and eutrophication levels are simulated through the environmental biological simulation unit; through an outside-in test mode, a sealing door at the bottom of the experiment module is opened, the underwater robot and other equipment are allowed to freely enter and exit, the dynamic response and control algorithm of the underwater robot when entering a complex environment (external real ocean) from a calm environment (in the experiment module) can be tested, and in-situ storage of a sampled sample can be realized.

The invention relates to the technical field of environment monitoring and remote sensing information processing, and discloses a remote sensing data coupled culture area nutritive salt concentration prediction method and system. The method comprises the following steps: constructing a physically constrained ecological hydrodynamic model to generate synthetic remote sensing-nutritive salt pairing data; fusing multi-source remote sensing and actual measurement data to form a high-dimensional feature tensor; separating breeding sensitive features from environment interference features through an attention-guided domain invariant feature decoupling network; migrating priori knowledge of a source domain large-scale culture area by using a dynamic weight cross-domain knowledge distillation architecture; and finally, real-time high-precision nutritive salt concentration distribution is smoothly output through a lightweight regression head and a time sequence. The system comprises corresponding functional units. According to the method, the prediction precision and stability in a small sample scene are improved, negative migration is inhibited, and support is provided for precise cultivation and eutrophication early warning.

The invention relates to the technical field of water quality monitoring, in particular to a digital twin water quality automatic monitoring and intelligent early warning method. The method comprises the following steps: arranging a multi-parameter sensor array in an entity water area, collecting real-time data of various water quality parameters, and recording the starting moment of each parameter deviating from a baseline value to form a parameter response time difference sequence; matching the parameter response time difference sequence with a preset pollution source time difference feature library to determine a pollution source type, and calculating a pollution feature coefficient according to the deviation degree; nighttime dissolved oxygen monitoring data in the real-time data are extracted, a dissolved oxygen forward change accumulated value is calculated to serve as a nighttime oscillation index, and when the nighttime oscillation index exceeds a preset oscillation threshold value, the water eutrophication risk is judged in combination with the pollution characteristic coefficient. Through parameter response time difference characteristic comparison and pollution characteristic coefficient calculation, the pollution source type and the pollution event stage can be automatically identified, and uncertainty is reduced.

Processes and systems for providing a CO2 enriched stream from an air stream, by: selectively adsorbing, in a first separation zone, CO2 and H2O in an air stream and providing a CO2 and H2O depleted gas stream; separating, in a second separation zone, the CO2 and H2O depleted gas stream and providing an N2 enriched stream, an O2 enriched stream, and an N2 enriched regeneration stream; heating the N2 enriched regeneration stream to provide a heated N2 enriched regeneration stream; selectively desorbing, in the first separation zone, the CO2 and H2O using the heated N2 enriched regeneration stream and providing a spent regeneration gas stream; drying the spent regeneration gas stream to remove H2O and providing a dried spent regeneration gas stream; and separating, in a third separation zone, the CO2 from the dried spent regeneration gas stream to provide a CO2 enriched stream.

The invention discloses a method for combining straw returning to field, pond fish culture and rice, fish and soft-shelled turtle / shrimp comprehensive planting and breeding, and belongs to the technical field of rice, soft-shelled turtle, fish and shrimp comprehensive planting and breeding. After rice in the rice field is harvested, straw is smashed and returned to the field, a hidden survival place is provided for crayfish seedlings, rotten straw and derived zooplankter provide bait for crayfish and fish, and the straw decomposition rate is increased by eating; after water in the rice field module becomes serious along with straw rotting, the water is discharged into the culture pond through tail water treatment engineering treatment, and the water fertility of the pond is increased; meanwhile, after eutrophication of the water body in the culture pond, the water body is discharged into the rice field after being treated by a tail water treatment project and flows into the culture pond again after being further purified by the rice field. According to the constructed mode, the straw is converted into the organic fertilizer through the crayfish and the fish, and the paddy field is adopted for purifying pond culture tail water. No breeding wastewater is discharged in the mode. The investment of aquatic product baits and rice field fertilizers is reduced, and the income and quality of rice and fishes are increased.

This invention discloses a method and system for monitoring and assessing the marine aquaculture environment using IoT big data. The method includes: collecting multi-dimensional environmental parameters such as dissolved oxygen, nitrogen and phosphorus nutrients, and pH value through IoT sensing devices; performing parallel reception and status verification through a high-concurrency marine environmental data processing platform; using a multi-dimensional time-series data adaptive clustering algorithm to perform time-series segmentation and similarity clustering of the parameters; quantitatively assessing water quality status based on the clustering results using a eutrophication assessment model; and then dynamically predicting stress intensity and duration using an environmental stress response prediction model, combined with parameters adapted to the growth cycle of aquaculture organisms. The platform integrates the assessment and prediction results to generate a structured report including parameter change trajectories, level indicators, and predicted trend curves, achieving precise monitoring and assessment of the marine aquaculture environment throughout the entire process, providing reliable technical support for aquaculture environment regulation.

The invention belongs to the technical field of marine environment monitoring and artificial intelligence, and discloses a method for intelligently monitoring coastal water eutrophication. The method comprises the following steps: acquiring and matching spectrum, space and time parameters of a remote sensing image and actually measured data; constructing a multi-modal feature data set; a hybrid prediction model formed by cascading a Transform network and a support vector regression model is constructed and trained, and the Transform network performs unified modeling and deeply fuses multi-source features such as spectrum, space and time through a self-attention mechanism of the Transform network, so that deep intelligent fusion of the multi-source features is realized; performing water quality index prediction and eutrophication state evaluation by using the trained model; and finally, carrying out uncertainty quantization on a prediction result by adopting a Monte Carlo random inactivation technology. According to the invention, the problems of low precision and weak generalization caused by spatial heterogeneity and complex optical characteristics in coastal water monitoring are effectively solved.

The application relates to the technical field of fuel preparation, in particular to a device for preparing hydrogen-ammonia fuel from eutrophication water bodies, which comprises a pretreatment assembly, a heating assembly, a stripping assembly and a hydrogen-oxygen preparation assembly. The stripping assembly comprises a first box body, a second box body and a collecting box. A stripping cavity and a collecting cavity are arranged in the first box body and are in gas communication. A gas pump is arranged outside the stripping cavity. An ammonia gas storage tank is arranged on the separating box. The hydrogen-oxygen preparation assembly comprises a cathode electrolytic cell and an anode electrolytic cell. The cathode electrolytic cell is in communication with the stripping cavity, and a hydrogen gas storage tank is arranged on the cathode electrolytic cell. The water body with adjusted PH value and heated enters the stripping cavity. The ammonia gas is blown out by the gas pump, enriched through the collecting box, and then extracted and purified through the separating box. The water body after stripping enters the cathode electrolytic cell for electrolysis and obtains pure hydrogen gas. Therefore, the hydrogen-ammonia fuel is prepared from the eutrophication water body, the production cost is low, and the device has high economic benefits.

The present application belongs to the technical field of remote sensing image intelligent analysis, and particularly relates to a kind of lake eutrophication remote sensing intelligent monitoring and early warning method and system, method includes: the water quality data of the river lake to be monitored is collected, and pretreated;Based on the water quality data after pretreatment, using space-time matching algorithm, construct water quality parameter inversion sample library;Based on water quality parameter inversion sample library, using dynamic entropy weight method determines the weight of each water quality parameter, obtains comprehensive lake eutrophication index;Based on the physical constraint deep learning fusion model framework, construct lake eutrophication early warning model;Based on comprehensive lake eutrophication index and lake eutrophication early warning model, realize the real-time dynamic early warning to lake eutrophication degree.

The invention discloses a duckweed type eutrophication water body monitoring method based on sentinel No.2 satellite images, and relates to the technical field of water body monitoring, and the method comprises the following steps: carrying out atmospheric correction processing on sentinel No.2 L1 C-level satellite images in a non-duckweed growth season and a duckweed growth season, and then re-sampling all wave bands to the same resolution; performing mean filtering on a blue wave band, a green wave band, a red wave band, a near-infrared wave band and a narrow near-infrared wave band of the multi-wave-band surface reflectance image after re-sampling in the non-duckweed growth season and the duckweed growth season, and then performing wave band synthesis to obtain a non-duckweed growth season wave band synthesis image and a duckweed growth season wave band synthesis image; and calculating the proportion of the duckweed growth range in the water body range by using the non-duckweed growth season waveband synthetic image and the duckweed growth season waveband synthetic image. The duckweed type eutrophication water body can be rapidly monitored in a large range at low cost.

This invention relates to a method for immobilizing Chlorella, in order to... Chlorella Using *Chlorella sp. FACHB-9* as the culture medium, *Chlorella* solution was inoculated into the culture medium and cultured under conditions where light intensity varied with concentration to obtain a high-concentration *Chlorella* solution. Chitosan-modified rope-shaped artificial aquatic plants, used as an immobilization carrier, were added to the high-concentration *Chlorella* solution and fixed in a constant-temperature shaker at 25–35℃ and 120–180 rpm for 20–30 hours. After removal and drainage, immobilized *Chlorella* was obtained. An immobilized *Chlorella* was prepared by the above method. An application of the immobilized *Chlorella* was also described: the immobilized *Chlorella* was used to remove nitrogen and phosphorus from aquaculture wastewater. The beneficial effects included: effective removal of nitrogen and phosphorus pollution from aquaculture wastewater, prevention of eutrophication, reduction of wastewater treatment costs, inhibition of *Microcystis aeruginosa* growth, and creation of additional economic value through the resource utilization of *Chlorella*.

The invention provides a stepped purification circulating device for eutrophication treatment of a black and odorous water body, which belongs to the technical field of purification devices and comprises a top cover, an air floatation bin, a distribution bin and a culture bin, a capturing mechanism is arranged in the air floatation bin; scattering mechanisms are arranged on the side walls of the scattering bins; a culture mechanism is arranged in the culture bin; the capturing mechanism comprises a first motor and a gas conveying pipe; the first motor is connected with the central shaft; a plurality of rotary blades are arranged on the side wall of the central shaft; the side wall of the gas conveying pipe is communicated with a plurality of gas distribution pipes; the outer wall of the gas distribution pipe is communicated with a plurality of capillaries. Microbubbles are generated through the capillary tube array, the microbubbles are adsorbed on the surface of the suspended microalgae, the suspended microalgae are gathered to the water surface by utilizing buoyancy, the capture rate of the suspended microalgae with small particle size in the water body is improved, the microbubbles have larger gas-liquid contact area and are more easily dissolved in water, and the dissolved oxygen concentration of the water body is effectively improved. The invention also relates to a use method of the stepped purification circulating device for eutrophication treatment of the black and odorous water body.

The invention relates to the technical field of aquaculture, in particular to an accurate regulation and control method for micropterus salmoides culture water quality. According to the micropterus salmoides culture water quality regulation and control method, a culture water body meets one or more of the following conditions: (1) adding photosynthetic bacteria into the culture water body every day, and controlling the final concentration of the photosynthetic bacteria in the water body to be 10 < 6 >-10 < 7 > CFU / mL; (2) adjusting the content of dissolved oxygen in the culture water body to 5.5-7.5 mg / L; (3) adjusting the temperature of the culture water to 26 + / -1 DEG C in the daytime and 23 + / -1 DEG C at night. The total nitrogen, total organic carbon and chemical oxygen demand can be obviously reduced through day and night temperature regulation and addition of photosynthetic bacteria, the water change demand is reduced, and the eutrophication risk is reduced; meanwhile, the specific growth rate (SGR) and the weight growth rate (WGH) are improved, the immune and antioxidant indexes are optimized, and the aeration energy consumption is reduced by controlling dissolved oxygen to be 7.0 mg / L.

This invention presents a method for retrieving chlorophyll a concentration in surface water based on satellite remote sensing. The method acquires remote sensing images from a satellite that match the acquisition time of the water quality data. Based on the spectral information extracted from these images, a new grayscale image is generated. A grayscale co-occurrence matrix (HCEM) is calculated from this new image. The HCEM is then used to mine the texture features contained in the remote sensing images, and each texture feature is quantified. This results in a significantly improved model performance compared to models trained solely using spectral information. Furthermore, with the same amount of raw data, this invention achieves higher accuracy, which is beneficial for the precise measurement of surface water eutrophication.

This invention discloses an antifouling membrane made of lanthanum-loaded carbon nanomaterials suitable for phosphorus recovery in wastewater, its preparation method, and its applications. The invention involves loading lanthanum carbonate octahydrate onto the surface of multi-walled carbon nanotubes (MWCNTs) to form lanthanum-loaded carbon nanomaterials (La@MWCNTs), which are then deposited onto the surface of a polyethersulfone-based membrane using vacuum filtration to form a self-supporting membrane. The prepared lanthanum-loaded carbon nanomaterial antifouling membrane possesses both phosphorus removal and recovery capabilities, exhibiting high efficiency in phosphorus removal from water. This facilitates phosphorus elution and recovery, effectively solving the problems of lanthanum-loaded carbon nanomaterial aggregation and recovery, and effectively avoiding the risk of lanthanum-based adsorbent leakage during phosphorus removal. Furthermore, the lanthanum-loaded carbon nanomaterial antifouling membrane operates within a low-pressure range, exhibiting low energy consumption and effectively mitigating membrane fouling caused by humic acid. It shows promising application prospects in wastewater phosphorus recovery and eutrophication control.

The application discloses a kind of based on sentinel-2 satellite image's duckweed type eutrophication water monitoring method, it is related to water monitoring technical field, including the following steps: after the atmospheric correction processing of sentinel-2 L1 C level satellite image of non-duckweed growing season and duckweed growing season, all wavebands are resampled to the same resolution, after mean filtering to the blue band, green band, red band, near infrared band, narrow near infrared band of multi-band surface reflectance image after resampling of non-duckweed growing season and duckweed growing season, then band synthesis is carried out, obtain non-duckweed growing season band synthesis image and duckweed growing season band synthesis image;The proportion of duckweed growing range in water range is calculated using non-duckweed growing season band synthesis image and duckweed growing season band synthesis image.The present application can realize the fast, large-scale, low-cost duckweed type eutrophication water monitoring.

The application provides a kind of urban landscape water body eutrophication monitoring and purification equipment, belongs to water purification technical field. Including installation main rod, center is through the through installation mouth and is set in the installation main rod outside installation floating plate, water purification assembly is set on installation floating plate, intelligent monitoring assembly;The water purification assembly of the application carries out processing when the water body to be repaired, utilize light reaction tank, light reaction tank can decompose organic pollutants, algae and other eutrophication related substances in water body by photocatalytic reaction;Drug release mechanism can release chemical reagent pertinently, adjust the acidity and alkalinity of water body, kill harmful microorganism;Submerged plant main body can absorb nitrogen, phosphorus and other nutrient elements in water body, provide habitat for aquatic animals at the same time, improve water ecological environment, this kind of multi-mode combination can solve water body eutrophication problem from multiple angles, make purification effect more thorough.

This utility model relates to a fountain structure for ecological restoration of eutrophication in a landscape lake, including a water inlet tank. A filter screen is installed on the inner wall of the water inlet tank. Multiple water inlets are opened on the outer surface of the water inlet tank, and multiple water inlets are opened on the upper surface of the water inlet tank. A protective box is installed on the upper surface of the water inlet tank, and a first motor is installed on the inner bottom wall of the protective box. This utility model, through a dual composite water inlet structure of water inlets and water inlets, combined with the filter screen installed on the inner wall, can intercept large particles of debris such as aquatic plants and large-diameter organic debris, avoiding the problem of device clogging. The first motor drives the rotating rod and stirring rod to rotate at high speed, and the resulting vortex can disperse algae clusters and fine organic debris in the water inlet tank, preventing them from depositing at the bottom of the water inlet tank to form an anaerobic sediment layer. This design avoids secondary pollution and also prevents deposited debris from being carried into the subsequent biological treatment stage by the water flow, ensuring the stability of the microbial degradation environment.

This utility model provides a three-dimensional sea cucumber farming device, relating to the field of sea cucumber farming technology. It includes a farming box, multiple sea cucumber cages, and multiple algae cages, arranged alternately within the farming box. Each sea cucumber cage includes a first mesh plate and a second mesh plate, slidably connected within the farming box. The first mesh plate has multiple first farming baskets, and the second mesh plate has a cover plate and multiple second farming baskets. The first and second farming baskets are arranged alternately, with the cover plate close to the top of the topmost first farming basket. This utility model allows for the interleaved cultivation of sea cucumbers and algae within the farming box. During their growth, the algae absorb nutrients such as nitrogen and phosphorus from the water, avoiding pollution caused by eutrophication. Simultaneously, the algae increase the amount of plankton and microorganisms in the water, increasing the food source for sea cucumbers, reducing feed costs, and improving the environmental friendliness of industrialized sea cucumber farming.

The method for preparing high-phosphorus Chlamydomonas based on PTB2 overexpression and its application in phosphorus recovery belongs to the fields of bioengineering and environmental science. This method obtains recombinant Chlamydomonas by cloning and overexpressing the PTB2 gene, a sodium-phosphorus-dependent phosphate transporter, from Chlamydomonas reinhardtii. This recombinant Chlamydomonas exhibits a synergistic and significant increase in total phosphorus content and polyphosphate content, while also showing promoted growth. The high-phosphorus recombinant Chlamydomonas of this invention can efficiently remove phosphorus from water bodies and can be used for eutrophication control; simultaneously, its high-phosphorus biomass can serve as a high-quality microalgal fertilizer raw material, providing an efficient and environmentally friendly technical solution for the biological recovery and recycling of phosphorus resources.

The present application relates to the field of eutrophication lake water ecological restoration, and discloses a device and system for improving underwater light conditions of a lake. Natural light on the water surface is introduced into the underwater area near the device through refraction and reflection by using a light path system, effectively improving the underwater light intensity. A wave dissipation system is arranged below the light path system to prevent disturbance of the water body and sediments by small waves, to a certain extent, reducing the influence of sediments and resuspension on water transparency, and further improving the underwater light conditions. The light path system, the wave dissipation system and the underwater fixing system are sequentially fixed and connected from top to bottom, and the height of the light path system and the wave dissipation system is adjusted through the underwater fixing system with the rise and fall of the water surface, improving the applicability of the device. The device has the characteristics of simple structure, convenient operation, good performance, easy installation and recycling, etc. It can effectively reduce the adverse effects of insufficient underwater light of the lake and wave disturbance on the growth of submerged plants.

This utility model relates to the field of wastewater treatment and resource recovery technology, specifically disclosing an integrated device for anaerobic fermentation of sludge to produce biogas and recover phosphorus, including: an anaerobic fermentation unit, a phosphorus recovery unit, a sludge treatment unit, a biogas recovery unit, a dosing unit, and a PLC control device. In this integrated device, after the phosphorus-rich supernatant released from the anaerobic fermentation unit enters the sedimentation tank, the PLC control device adjusts the pH to 8.5-9.0 according to data from a pH monitor, using a sodium hydroxide dosing machine, while simultaneously adding magnesium chloride via a magnesium chloride dosing machine. 2+ , prompting PO4 3‑ NH4 + With Mg 2+ The reaction produces struvite, which is then accelerated by adding PAM through a PAM dosing machine. Finally, the struvite is collected and dried through an inclined tube, realizing the targeted recovery and resource utilization of phosphorus in sludge. This avoids eutrophication of water bodies caused by phosphorus discharge with sludge and significantly improves the utilization rate of phosphorus resources.

The invention relates to the technical field of agricultural technologies, and discloses a perlite water and fertilizer retention slow release fertilizer which is prepared from the following components in parts by weight: 10-30 parts of a chemical fertilizer, 5-20 parts of a phosphate fertilizer, 5-20 parts of a potash fertilizer, 20-50 parts of water and 10-40 parts of perlite, according to the preparation method, the porous perlite is used as a fertilizer carrier, the core problem of low fertilizer utilization rate is effectively solved, leaching and runoff loss of soluble nutrients such as nitrogen and potassium in the early stage of crop growth are remarkably reduced, it is ensured that the fertilizer can be fully absorbed in the critical period of fertilizer demand of nursery stocks, the fertilizer utilization rate is greatly increased, and the yield of the nursery stocks is increased. The agricultural production cost is reduced, and the environmental pressure such as water eutrophication caused by nutrient loss is relieved from the source.

The invention discloses a device and method for evaluating influence of human activities on a plateau lake ecosystem, a barrel body is arranged in a semi-buried mode, the input end of an independent pumping system is externally connected with at least one liquid medicine bin, and the output end of the independent pumping system is arranged corresponding to the interior of the barrel body; a test end of the independent ecological monitoring part is arranged corresponding to the interior of the barrel body and is used for monitoring water environment parameters and macroscopic plant states; one end of the common pumping system comprises a plurality of inner end pipelines connected in parallel, and the common ecological monitoring part is arranged at the other end of the common pumping system and used for detecting the microcosmic plant state; according to the device and method for evaluating the influence of human activities on the plateau lake ecosystem, the semi-buried barrel body is combined with the hydrological control module, the plateau lake low-temperature environment and underground heat exchange characteristics are effectively restored, and the influence of human activities on the plateau lake ecosystem is evaluated through cooperative operation of the atmosphere testing part independent ecological monitoring part independent pumping system hydrological control module. The dynamic superposition interference simulation of eutrophication and climate warming is realized, and the limitation of a laboratory microcosmic device is broken through.

This invention discloses an alkaline, phosphorus-free nano-chelating agent, which, by weight percentage, is composed of the following components: 30%–40% sodium hydroxide, 6%–15% polyethylene terephthalate, 5%–10% polyglutamic acid, 1%–5% polysuccinimide, 11%–18% ammonium citrate, 2%–9% nano-silica, 2%–9% nano-alumina, and the balance being water. This phosphorus-free nano-chelating agent contains no phosphorus and will not cause phosphorus pollution during use. Compared to traditional phosphorus-containing chemicals, it is more environmentally friendly and helps reduce phosphorus content in water bodies, thereby mitigating environmental problems such as eutrophication.