55 results about "Nitrogen cycle" patented technology

The invention provides acinetobacter for culturing prawns in saline-alkali water and application of the acinetobacter. The preservation number of the provided acinetobacter is CGMCC (China General Microbiological Culture Collection Center) No.36066. The acinetobacter soilis strain provided by the invention has remarkable comprehensive application advantages, can still keep higher growth activity and metabolic capability in a low-temperature environment, and continuously plays a water body purification function. Ammonia nitrogen and nitrite nitrogen in a water body can be efficiently degraded, the environment of the aquatic water body is remarkably improved by promoting the nitrogen circulation process, and harm caused by nitrogen pollution is reduced. In addition, the strain can effectively inhibit and prevent reproduction of pathogenic vibrios and reduce the occurrence risk of bacterial diseases of aquatic animals. The strain is high in safety, does not cause poison or stress reaction to bred animals even under the condition of high-concentration use, and has good ecological safety and environmental friendliness.

The invention discloses a soybean planting pollution reduction and carbon reduction measure effect prediction method based on machine learning scenario simulation, and belongs to the field of pollution reduction and carbon reduction, and the method comprises the steps: firstly collecting root system and microorganism data of a soybean planting area, and quantifying the interaction intensity through a random forest algorithm; the nitrogen circulation state is judged, and the acceleration degree is determined; predicting the carbon storage change in combination with a support vector machine model; further extracting ecological influence variables, and evaluating the environmental benefit optimization potential through cross-planting condition comparison; performing simulation adjustment on the measure combination with high potential to generate a combined index of nitrogen cycle and carbon storage change; determining a correction coefficient through clustering analysis trend data; and finally, multi-source simulation results are fused to generate a precise ecological influence assessment report. According to the method, the problems of insufficient root-microorganism interaction quantification, weak nitrogen-carbon process coupling analysis and large dynamic prediction deviation in the prior art are solved.

The invention discloses an earthworm compost upgrading method based on a bacillus velezensis BV-1 aerobic compost product. Comprising the following steps: by taking an aerobic compost rotten product pretreated by bacillus velezensis BV-1 as a substrate, adjusting the moisture content of the substrate to a proper value without additionally adding a conditioner, inoculating eisenia foetida, performing earthworm composting in a dark environment, slightly turning piles every 4-5 days during the period to prevent anaerobism, and maintaining the moisture content of the substrate to be stable. The quality of the earthworm cast is remarkably improved through'matrix advantage + microorganism continuation effect 'of a BV-1 aerobic composting product, and the total nitrogen content of the earthworm cast reaches 18.29 g / kg and is improved by 12.6% compared with that of a control group; the conductivity is reduced to 1.84 mS / cm and is reduced by 8.91% compared with that of a control group; meanwhile, a nitrogen cycle functional gene (the relative expression quantity of the nosZ gene is increased by 15 times compared with that of a control group) is activated, organic matter degrading bacteria Arenibacter (the relative abundance is 8.37%) are enriched, and unification of high nitrogen, low salt and high biological activity of earthworm compost products is achieved.

The invention discloses a biochar rice field water carbon and nitrogen cycle process simulation method based on a DNDC model, which comprises the following steps: firstly obtaining basic data of rice growth and test monitoring data of a rice ecosystem under biochar treatment, and then constructing a biochar organic fertilizer module to improve the DNDC model; the method comprises the following steps: establishing a Biochar-DNDC model according to basic data of rice growth and test monitoring data, then calibrating and verifying the Biochar-DNDC model by adopting the test monitoring data, and finally simulating the water carbon and nitrogen cycle process of the biochar rice field by adopting the verified Biochar-DNDC model to obtain the water carbon and nitrogen cycle process of a rice field ecosystem under the condition that biochar is applied to a target area. The simulation accuracy of the DNDC model on the charcoal rice field water carbon nitrogen cycle process is improved, and the simulation result of the charcoal rice ecosystem carbon sequestration emission reduction synergy potential is more real and accurate.

The utility model discloses a nitrogen circulating and collecting device. Wherein the nitrous oxide monitoring chamber is hermetically mounted above the plant growth chamber; a space is defined between the nitrous oxide monitoring chamber and the plant growth chamber, a gas inlet and a gas outlet are formed in the nitrous oxide monitoring chamber, and the gas outlet is sequentially connected with a nitrous oxide sensor, a gas pump and the gas inlet through a gas pipeline to form a loop; and the lower end of the nitrous oxide monitoring chamber is integrally and fixedly connected with an annular fitting step. According to the utility model, the interference of man-made disturbance in the acquisition process can be reduced, and the accuracy and reliability of monitoring data are improved.

The invention discloses a device and a method for preparing high-pressure CO through pressurization dehydrogenation and demethanization of a nitrogen throttling expansion CO pump, and belongs to the technical field of chemical cryogenic separation. The specific structure is as follows: purified gas from the upstream is cooled by a first heat exchanger, a stripping tower reboiler and a second heat exchanger in sequence and then enters a hydrogen-rich gas flash tank; a liquid phase at the bottom of the hydrogen-rich gas flash tank enters a stripping tower for continuous separation; a liquid phase at the bottom of the stripping tower enters a demethanizing tower for demethanizing treatment; a gas phase at the top of the demethanization tower is completely condensed by a demethanization tower condenser and then enters a demethanization tower separation tank, a liquid phase at the bottom of the separation tank is pressurized by a CO liquid pump and then is reheated by a second heat exchanger and a first heat exchanger in sequence, and a high-pressure CO product is obtained and discharged out of the cold box. The nitrogen circulation compressor provides nitrogen circulation refrigeration for the cold box, one part of circulation nitrogen provides cold energy for the demethanizer condenser after being pre-cooled and throttled and then flows back to the nitrogen circulation compressor, and the other part of circulation nitrogen is expanded and refrigerated through the nitrogen expansion machine and provides additional cold energy supplement for the cold box.

The invention discloses a wetland nitrogen cycle optimization method and system based on machine learning, and belongs to the technical field of ecological engineering.The method comprises the steps that according to a comprehensive environment data set, a transverse lateral infiltration path and a vertical priority flow path are recognized, spatio-temporal evolution simulation is conducted through a cellular automaton model, and a nitrogen migration path is constructed; analyzing the interaction between the water flow driving flux and the underground water level on the path resistance, and determining the broadening degree of the transverse lateral seepage path; if the widening degree exceeds a preset threshold value, integrating the water body turbulence intensity data and the flow velocity shear effect value, and obtaining a bubble escape rate and a surface sediment disturbance frequency; calculating the nitrogen saturation and the spatial distribution of the sediment particle suspension amount, and obtaining the total re-release flux through flux overlay analysis; and constructing a nitrogen loss flux model in combination with the fluctuation rule, simulating the change of the nitrogen loss proportion, and determining the net nitrogen loss flux. According to the invention, fine monitoring of the dynamic change of wetland nitrogen can be realized.

This invention relates to the field of molten salt energy storage technology and discloses a molten salt energy storage system. The molten salt energy storage system includes: a molten salt tank with an inner cavity and an outlet and inlet communicating with the inner cavity; the inner cavity is capable of storing nitrogen and high-temperature molten salt for energy storage; a nitrogen circulation pipeline connected between the outlet and inlet for exporting nitrogen from the molten salt tank through the outlet and importing it through the inlet; and a flow-dispersing device located in the inner cavity and communicating with the inlet, the flow-dispersing device including a jet nozzle, through which nitrogen introduced from the inlet is exported to agitate the molten salt. This invention places the flow-dispersing device in the inner cavity of the molten salt tank. The nitrogen exported through the jet nozzle of the flow-dispersing device forms an upward flow of bubbles, agitating the molten salt in the tank. This enhances the fluidity of the molten salt within the tank, improves the heat exchange effect between the molten salt and the heating and releasing units within the tank, increases the heat transfer efficiency of the molten salt, and improves the heat exchange effect between the energy release stage and the water in the water pipeline. It also improves the uniformity of nitrogen sealing.

The invention discloses a light-driven nitrogen cycle pyrolysis-gasification biomass graded utilization system and method, and relates to the technical field of biomass graded utilization, the system comprises a pretreatment unit, a light-driven nitrogen-doped pyrolysis reactor and a photocatalytic nitrogen de-intercalation gasification reactor as core parts, an energy collection unit and a post-treatment unit. The method comprises condensation ammonia-doped pyrolysis and condensation gasification: pretreated biomass is subjected to condensation ammonia-doped pyrolysis in a pyrolysis section to generate high-activity nitrogen-doped coke and hydrogen, then the nitrogen-doped coke enters a gasification section to be subjected to condensation gasification, under the action of high-concentration water vapor, nitrogen elements in the coke are deintercalated, more active sites are released, NH3 is generated at the same time, and the nitrogen-doped coke enters the gasification section to be subjected to condensation gasification; the nitrogen can flow back to the pyrolysis zone for cyclic utilization, and a nitrogen doping-de-intercalation catalytic cycle process is formed. The light-driven nitrogen cycle grading technology is adopted, efficient doping of nitrogen elements at the high temperature is achieved, high-activity nitrogen-doped coke is generated, and production of high-quality synthesis gas and cyclic utilization of nitrogen are achieved.

The utility model belongs to refrigeration technical field, specifically disclose a kind of nitrogen circulation refrigeration system for cryogenic separation device, including fractionating column, nitrogen compressor, plate heat exchanger and intake pipe;Raw gas is connected to fractionating column by intake pipe after passing plate heat exchanger, can carry out preliminary cooling to raw gas;The inside top of fractionating column is equipped with tubular heat exchanger, and the top of fractionating column is connected with first gas outlet pipe, and first gas outlet pipe is connected with second gas outlet pipe after passing plate heat exchanger, reheats and exports process gas;Tubular heat exchanger is connected by first pipeline and is connected to nitrogen compressor again by the internal pipeline of plate heat exchanger, and after passing nitrogen compressor, the high-pressure normal-temperature nitrogen gas generated by it is connected back to plate heat exchanger by third pipeline, and after preliminary cooling by plate heat exchanger, it is connected back to tubular heat exchanger by fourth pipeline to provide cold quantity, can realize the rapid cooling of fractionating column overhead, shorten driving cycle.

A phage and its use in compensating soil nitrogen fixation: Klebsiella pneumoniae phage φYSZKA, wherein the method has solved some problems of conventional azotobacters, such as high cost, interspecific competition and limited range of application. Through phage transplantation, the efficiency of microbial nitrogen fixation in soil can be improved, and thus, more nitrogen sources may be provided for the nitrogen cycle and plant growth in ecosystems. Also, a new solution is provided for the nitrogen sequestration process of soil in saline-alkali lands, tea plantations and pesticide-polluted sites in China.

The invention provides cold-resistant bacillus subtilis for pond culture under a low-temperature condition. The preservation number of the cold-resistant bacillus subtilis is CGMCC (China General Microbiological Culture Collection Center) No.36068. The cold-resistant bacillus subtilis strain provided by the invention has remarkable comprehensive application advantages, can keep higher growth activity and metabolic capability in a low-temperature environment, and continuously plays a water body purification function. Ammonia nitrogen and nitrite nitrogen in a water body can be efficiently degraded, the environment of the aquatic water body is remarkably improved by promoting the nitrogen circulation process, and harm caused by nitrogen pollution is reduced. The strain is high in safety, does not cause poison or stress reaction to bred animals even under the condition of high-concentration use, and has good ecological safety and environmental friendliness.

The invention belongs to the technical field of biological agriculture, and particularly discloses a method for improving soil fertility by intercropping tea champagne and enriching nitrogen circulating microorganisms. The method comprises the following steps of selecting a garden plot, performing soil preparation, and performing line-to-line intercropping on the big-leaf tea and the areca catechu. The invention discloses a method for improving soil fertility by intercropping tea champagne and enriching nitrogen circulating microorganisms, which can significantly improve the diversity of soil microbial communities, improve soil fertility, improve and maintain nitrogen supply by activating the microbial function of soil, and significantly reduce the dependence on chemical nitrogen fertilizer.

The present application belongs to the field of microbial technology. More particularly, it relates to a salt-tolerant Bradyrhizobium sp. strain RY15 and its application. The Bradyrhizobium sp. strain RY15 provided by the present application has excellent salt tolerance and can significantly promote the growth and development and nodule fixation ability of Desmodium velutinum. The pot experiment results prove that the application of the RY15 strain can significantly increase the fresh weight of the aboveground part, the fresh weight of the underground part and the number of nodules of Desmodium velutinum; in the saline soil field, the yield of the pasture is increased by 68.89% after the inoculation of the RY15 inoculant. The RY15 strain of the present application can be made into a liquid or solid microbial inoculant, which is suitable for seed dressing, root soaking or soil application, and is simple to operate, low in cost and easy to popularize. The RY15 strain of the present application is a natural symbiotic bacterium, is safe and non-toxic, can improve the nitrogen cycle of soil, expand the planting of high-quality leguminous forage in saline-alkali soil, and has good application prospect and application value.

This invention discloses a method for regulating early maturity of citrus fruits based on environmental data processing under plastic film mulching, specifically relating to the fields of agricultural data processing and technology extension services. It addresses the problem that existing early maturity regulation models, due to their singular optimization objective, neglect the microecological changes caused by plastic film mulching, leading to increased pest and disease risks. By acquiring soil temperature and humidity data after plastic film mulching, and based on a pre-established correlation model, the method determines the pathogen inhibition function imbalance index and carbon and nitrogen cycle disturbance intensity, characterizing soil microecological health, and assesses the risk level of pest and disease occurrence. Combined with sensitivity analysis results of the original agricultural operation plan, key agricultural operation parameters are adjusted in a targeted manner. The generated comprehensive regulation plan is serialized into a distributable and executable agricultural technology extension service package and promoted for implementation. This achieves end-to-end data processing from environmental data to microecological risk assessment to customized agronomic plan generation and services, improving the accuracy of agricultural technology extension.

The application provides a carbon sink potential prediction method and device fusing remote sensing and model technology. The carbon sink potential prediction method fusing remote sensing and model technology comprises the following steps: inputting multi-temporal remote sensing data into a vegetation type identification model based on historical remote sensing data and historical vegetation type labels to obtain vegetation structure dynamic distribution data; inputting the vegetation structure dynamic distribution data into a regional carbon-nitrogen cycle model based on historical crop distribution data and vegetation and soil dynamic data to obtain a regional carbon-nitrogen cycle dynamic simulation result; and determining carbon sink data according to the regional carbon-nitrogen cycle dynamic simulation result. The application can break through the bottleneck of insufficient regional scale carbon accounting data and high uncertainty, and realize carbon sink maximization.

The invention relates to a soil nitrogen cycle regulation and control method based on tire wear particles. The method comprises the steps that the tire wear particles are obtained; mixing the tire wear particles with soil, and performing pretreatment; wherein the mass ratio of the tire wear particles to the soil is 0.1%-0.5%; putting the mixed tire wear particles and soil into an illumination incubator, and culturing under a preset culture condition; collecting soil samples for analysis at a plurality of time points set in the culture period; wherein the addition of the tire wear particles affects the expression of nitrogen cycle genes in the microflora. The method has the beneficial effects that the tendency that the TWPs promotes ammonification in the soil is determined, the soil environment condition is changed by adding the TWPs, and particularly, the availability of nitrogen forms and the utilization mode of microorganisms on nitrogen in the forms are influenced.

The present application relates to a kind of low-carbon local partial circumfluent flow contact wetland system and its water quality purification method, belong to water treatment technical field.The low-carbon local partial circumfluent flow contact wetland system of the present application, including ecological activity recovery unit, nitrogen cycle intensification unit, circumfluent flow contact phosphorus cycle intensification unit and ecological stable unit in series, by the use of plant growth limit ring, frame filler and large leaf floating plant joint construction denitrification habitat, circumfluent flow contact array type filler column distribution, establish filler column adsorption and hold phosphorus cycle path of plant absorption and utilization, inverted horn support steel wire bundle support gramineae method etc.The combination use of technical scheme reaches no power low-carbon, prevent plant succession invasion, circumfluent flow contact anti-clogging, nutrient salt enrichment plant root system convenient recovery, with the beneficial effects such as enhanced denitrification and phosphorus removal, realize a kind of low-carbon local partial circumfluent flow contact wetland system applied to ecological safety buffer zone.

This invention relates to a device and method for dual-cycle refrigeration LNG helium extraction and light hydrocarbon recovery, belonging to the field of cryogenic liquefaction separation and natural gas helium extraction technology. The device integrates a mixed refrigerant refrigeration cycle and a nitrogen refrigeration cycle, and sequentially includes a feed gas pretreatment unit, a light hydrocarbon recovery unit, a denitrification liquefaction unit, and a helium extraction unit. The mixed refrigerant cycle provides cooling capacity for feed gas cooling liquefaction, light hydrocarbon recovery, and natural gas denitrification processes, while the nitrogen cycle provides deep cooling capacity for extracting crude helium from nitrogen-rich gas. In terms of method, the purified feed gas sequentially undergoes pretreatment, light hydrocarbon recovery, denitrification, and helium extraction steps to simultaneously produce LNG, crude helium, LPG, and stabilized light hydrocarbons. This invention has advantages such as high process energy efficiency, high helium and propane recovery rates, high purity of co-produced products, and reliable operation, realizing the high-value comprehensive utilization of natural gas resources.

The present application belongs to the technical field of river ecological restoration and water purification, and particularly relates to a river water ecological regulation and control device, aiming at solving the problems of poor microbial habitat, insufficient carbon source supply, limited purification effect and the like in the existing river water ecological restoration. The device is composed of a four-pyramid frame, a steel wire mesh, a central carbon source slow-release pipe and porous fillers. The four-pyramid frame is formed by welding profile steel, and the bottom and the periphery are welded with the steel wire mesh. The central carbon source slow-release pipe is vertically arranged in the center of the four-pyramid frame, and the pipe is filled with corn cobs. The porous fillers are filled in layers from bottom to top, the bottom layer is a volcanic rock layer, the second layer is a zeolite layer, and the top layer is a mixed layer of volcanic rock and zeolite. The present application provides a stable habitat for microorganisms and benthic animals, continuously releases carbon sources, strengthens the nitrogen cycle function, and has a significant water purification effect. The device has a stable structure, is convenient to maintain, has low cost, causes no secondary pollution, and can be widely applied to various river ecological restoration projects.

The invention discloses a system and a method for preparing LNG (Liquefied Natural Gas) by MRC cyclic compression denitrification of high-nitrogen-content feed gas, and belongs to the field of chemical processes. The system comprises a main heat exchanger, a denitrification tower, a denitrification tower reboiler, a denitrification tower condenser, a denitrification tower separation tank and a refrigerant uniform distribution tank group which are arranged in a cold box, and a mixed refrigerant circulating compression system arranged outside the cold box. According to the system provided by the invention, a conventional nitrogen circulating compression system is canceled, a gas-phase refrigerant from a final-stage separation tank of the mixed refrigerant circulating compression system is divided into light-component refrigerants and heavy-component refrigerants through a refrigerant uniform distribution tank group, and stepped cold energy utilization is carried out in high-temperature and low-temperature sections of a denitrification tower condenser, so that effective separation of a nitrogen component in high-nitrogen-content feed gas is realized, and the nitrogen content of the nitrogen-containing feed gas is improved. And the content of methane in waste nitrogen is controlled to be less than 1%, so that a process system is simplified, the complexity of a compression system and the equipment investment and maintenance cost are remarkably reduced, the compression efficiency of the system is effectively improved, and project deployment and field implementation are accelerated.

The invention discloses a nitrogen cycle low-temperature supersonic turbulent flow wall breaking device and method, and relates to the technical field of material crushing. The device comprises an air compressor, a feeding device, a display device, a wall breaking device, a fixing frame, a receiving device, a safety filter and an induced draft fan, the display device and the feeding device are both installed on the fixing frame. The air compressor is connected with the wall breaking device through the main fluid pipeline, the main fluid pipeline is provided with a vacuum detection port and an air source main valve, air flows into the main fluid pipeline through the vacuum detection port, and the air source main valve controls the air flow in the main fluid pipeline; materials enter the wall breaking device through the feeding device and the main fluid pipeline, enter the material receiving device through the discharging pipeline after being treated by the wall breaking device and then sequentially enter the safety filter and the induced draft fan through the exhaust pipeline to be flexibly connected with the safety filter, the materials are intercepted by the safety filter, and the induced draft fan is used for discharging redundant compressed air. According to the invention, the effects of high-speed rotational flow crushing and raw material impurity removal can be realized.

This invention provides a method and apparatus for denitrification, relating to the field of wastewater treatment technology. The denitrification apparatus provided by this invention has a reactor 13 divided into an aeration zone and an anoxic zone from top to bottom. In the anoxic zone, wastewater containing ammonia nitrogen utilizes its own COD to convert nitrate nitrogen into nitrite nitrogen, achieving short-cut denitrification. Aeration is supplied to the aeration zone via a membrane module 4, enabling a synergistic reaction of ammonia oxidation and anaerobic ammonia oxidation. Ammonia oxidation converts some ammonia nitrogen into nitrite nitrogen, while anaerobic ammonia oxidation converts the remaining ammonia nitrogen and nitrite nitrogen into nitrogen gas and nitrate nitrogen. The resulting nitrate nitrogen is returned to the anoxic zone via a liquid return path 9, forming a nitrogen cycle. This achieves partitioned coupling of short-cut denitrification and ammonia oxidation-anaerobic ammonia oxidation within the same reactor, eliminating the need for multi-stage equipment series connection, reducing equipment costs, and enabling stable operation of the entire apparatus after a successful initial start-up, with a short start-up cycle.

The invention discloses a device and a method for preparing high-pressure CO through nitrogen throttling expansion CO pump pressurization dehydrogenation, and belongs to the technical field of chemical cryogenic separation. The device comprises a nitrogen circulation compressor, and a first heat exchanger, a second heat exchanger, a stripping tower reboiler, a hydrogen-rich gas flash tank, a stripping tower, a CO liquid pump and a nitrogen expansion machine which are arranged in a cold box. The nitrogen circulation compressor participates in cold box circulation refrigeration, and the nitrogen expansion machine provides cold energy supplement. Purified gas from the upstream is cooled by the first heat exchanger, the stripping tower reboiler and the second heat exchanger in sequence and then enters the hydrogen-rich gas flash tank; a liquid phase at the bottom of the hydrogen-rich gas flash tank enters a stripping tower for continuous separation; a liquid phase at the bottom of the stripping tower is sequentially pressurized by the CO liquid pump and reheated by the first heat exchanger and then is discharged out of the cold box, so that a high-pressure CO product is obtained, and a conventional CO multi-stage circulating compressor is replaced. The system compression efficiency can be improved, the equipment cost is reduced, the equipment complexity is simplified, and the construction period is shortened.

The utility model belongs to the technical field of soil monitoring, and particularly relates to a farmland soil nitrogen circulation monitoring device which comprises a calandria group, a nitrogen circulation monitoring device, a nitrogen circulation monitoring device and a nitrogen circulation monitoring device. The plurality of inserting parts are respectively assembled on each pipe orifice at the step end of the calandria group; the number of the detection assemblies is multiple, and the detection assemblies are assembled in the insertion parts respectively; the assembling component is arranged at the flush end of the calandria group; and the control display is arranged on the assembly component, and is used for solving the problem that related data of soil nitrogen circulation in a whole unit area soil region cannot be obtained due to the fact that soil layers of a plurality of depth level surfaces cannot be monitored after a probe of a soil nitrogen detector is inserted into soil during monitoring of an existing detector.

This invention relates to the field of resource and environmental technology, specifically to a method and application of an algae-bacteria hybrid system for treating high ammonia nitrogen wastewater. By regulating nutrient and operational parameters, a functional community is constructed and maintained, dominated by microalgae and supplemented by bacteria and cyanobacteria, with their relative abundance within a preset optimized range. A clear interspecific interaction network forms within the system: microalgae such as *Nostoc* and *Chlorella* exhibit mutualistic symbiosis, while bacteria such as *Flavobacterium* show antagonistic relationships with these microalgae. Positive and negative feedback mechanisms maintain community balance and system robustness. The three components complement each other: microalgae primarily drive photocatalytic nitrogen and phosphorus removal, cyanobacteria provide nitrogen fixation and stability, and functional bacteria participate in organic matter degradation and nitrogen cycling, achieving synergistic metabolism through material exchange. Microbial ecological analysis confirms that a stable community structure and internal interaction mechanisms are the core of efficient and stable ammonia nitrogen reduction. This technology offers precise regulation, stable operation, and is environmentally friendly and economical, and can be widely applied to the treatment of various types of ammonia nitrogen-polluted water bodies.

The invention discloses an analysis method for rapidly accounting rice production carbon nitrogen footprint, sensitivity and uncertainty, which comprises the following steps of: 1, setting a plurality of straw returning gradients and nitrogen fertilizer application gradients through field trials, a matrix management combination is formed, key management measures of the whole rice growth process and key parameters including soil, crops and weather are recorded, and the matrix management combination is used for driving a dynamic simulation emission DNDC model so as to simulate field emission; 2, counting agricultural material investment and determining a reasonable emission factor range; 3, comprehensively calculating carbon and nitrogen footprints; 4, determining a parameter input range and analyzing the uncertainty and sensitivity of a result; 5, identifying a key driving factor; and 6, determining an optimal management scheme. According to the method, the field carbon and nitrogen cycle process under specific management measures can be dynamically simulated, the evaluation result is more accurate and more targeted than that of a traditional emission factor method, and the scientific level of agricultural environment influence evaluation is improved.

The invention provides application of plant source monoterpene in activating soil nitrogen cycle and promoting plant growth, and relates to the technical field of agricultural biology. Pot experiments prove that the monoterpene Trichodesmic acid can remodel a rhizosphere microbial community structure, significantly enrich proteobacteria and actinomycetes flora, up-regulate expression of nitrogen cycle key functional genes, and push a soil nitrogen metabolism pathway to be converted from a nitrogen fixation dominant mode to a nitrification-assimilation dominant mode, so that the content of total nitrogen and alkali-hydrolyzable nitrogen in soil is significantly increased. The synergistic effect of improving soil nutrients and promoting crop growth is achieved, and a novel plant source substance and an application scheme are provided for improving soil fertility and crop growth.

The invention belongs to the technical field of superconducting cooling cold energy recovery, and particularly discloses a cold energy recovery system suitable for a high-temperature superconducting cable, which is characterized in that a cold box and a liquid nitrogen tank are separately arranged, and a circulating pipeline and a first one-way pipeline are respectively used for circulating backflow liquid nitrogen and supplementing high-temperature liquid nitrogen; in the cold box, the liquid supplementing pipeline, the superconducting terminal and the external cold supply device are sequentially provided with multiple stages of heat exchange parts, and the multiple stages of heat exchange parts are matched with a cold nitrogen inlet located in the cold box and a second one-way pipeline communicated with the cold nitrogen inlet to uniformly lead out low-temperature nitrogen generated by evacuation and decompression, sequentially exchange heat according to the temperature gradient and then discharge the low-temperature nitrogen; the device has the following advantages that low-temperature nitrogen cascade recovery is achieved, backflow and liquid supplementing pre-cooling, dewar heat leakage reduction and external cooling are considered, and the energy efficiency and the operation stability are improved.