83results about How to "Improve habitat" patented technology

The invention discloses a composite type artificial algal reef comprising a mature algal reef and a seedling reef. The mature algal reef comprises a solid base. The upper surface of the solid base is embedded with a metal frame, wherein the shape of the metal frame is identical to that of the upper surface of the solid base and the size of the metal frame is identical to that of the upper surface of the solid base. A conch net bag is arranged in the metal frame. The center of the upper surface is embedded with a metal stand column. A steel ring is welded to the upper end of the stand column. A plurality of seedling ropes are fixed between the metal frame and the steel ring. The seedling reef is fixed to the side face of the solid base of the mature algal reef, and algal seedlings are attached to the seedling reef. By the adoption of the composite type artificial algal reef, the attaching effect of alga is guaranteed, the repair period of an algae field is shortened, the success rate of repair and reconstruction of the algae field is improved, the adhesive rate of the seedlings is increased, and the seedling reef is firm, durable, small in size, light, and convenient to carry; the net bag made of waste conches is placed in the metal frame, and a biophile reef can be composed through diffusion and attachment of spores of fronds on the seedling ropes; resource utilization of the waste conches is achieved, and composite type artificial algal reef has the advantages of being economical and easy and convenient to use.

The invention relates to a bypass offline river purifying method and a bypass offline river purifying system. According to the invention, a branch of a polluted river is adopted as a basis; a drainage channel is constructed, such that a bypass is formed; polluted river water is introduced into the bypass from the branch, such that the retention time of the polluted river water in the bypass is increased; in the bypass, pollutants are removed with offline and online ecological engineering technology and environmental engineering technology; and purified water flows into a main stream, such that river water quality is improved, and river ecosystem is restored. The invention also discloses a purifying system used for realizing the bypass offline river purifying method. According to the invention, main stream river channel original status is not changed, main stream flood protection is not influenced, and water quality purification and ecological restoration effects are good. The method and the system are suitable for ecological management and ecological restoration of polluted river with rich branches, dense drainage irrigation channels, or developed ponds.

The invention discloses a multifunctional bio-organic fertilizer and a preparation method thereof, and relates to the technical field of agricultural fertilizers. The multifunctional bio-organic fertilizer is prepared from the following raw materials in parts by weight: 40-60 parts of forestry and agricultural residues, 10-16 parts of active humic acid, 5-15 parts of degreased tea-seed pancake, 0.5-1.5 parts of expanded vermiculite, 0.2-0.8 part of abscisic acid, 0.2-0.8 part of zymophyte, 0.2-0.8 part of beneficial bacterium, 0.2-0.8 part of degrading bacteria, 5-9 parts of urea, 8-12 parts of calcium magnesium phosphate fertilizer, 4-8 parts of potassium sulfate, and 0.5-1.5 parts of medium and trace element. The multifunctional bio-organic fertilizer has the characteristics that the nutritional elements for plant growing are contained; the organic substances are rich; in addition, the contaminated oil can be remediated; the soil structure can be activated; the multifunctional bio-organic fertilizer is applicable to the planting of crops such as rice of southern China, vegetables, watermelon, tobacco, fresh ginger, rape and tea, fruits such as naval orange, grapefruit and pear, garden nursery stock and flowers.

The invention discloses a bioreactor for efficiently and economically synchronously removing nitrate nitrogen and ammonia nitrogen. A water distribution area, from bottom to top, is sequentially provided with a sludge discharge pipe and a water return-inlet pipe, a transverse partition plate is respectively arranged between the upper end of a short-range denitrification area and the bottom of an anaerobic ammonia oxidation area and between the upper end of the anaerobic ammonia oxidation area and the bottom of a separation area, the upper end of the short-range denitrification area and the bottom of the anaerobic ammonia oxidation area, as well as the upper end of the anaerobic ammonia oxidation area and the bottom of the separation area, are respectively connected through a flange, the two transverse partition plates are respectively provided with a sludge guide pipe and a liquid guide pipe, the upper part of the short-range denitrification area and the upper part of the anaerobic ammonia oxidation part are respectively provided with a gas pulse tube, the short-range denitrification area and the anaerobic ammonia oxidation area are respectively filled with a ball packing layer, the side wall of the separation area, from bottom to top, is sequentially provided with a sludge discharge outlet, an overflow tank and a water outlet, the center of the separation area is provided with a double-effect three-phase separator, the side wall of the middle part of the double-effect three-phase separator is provided with a return pipe, and the upper part of the double-effect three-phase separator is provided with a gas collecting connecting pipe and a gas exhaust pipe. According to the invention, an effect of simultaneous denitrification and carbon removal is achieved without aeration; due to the adoption of pulse exhaust, the floating loss of sludge is controlled; because the double-effect three-phase separator is provided, gas, liquid and solid phases are effectively separated.

The invention discloses a method for culturing South African sugpo prawns by a higher-place pond, high salinity and high density, and belongs to the technical field of marine culture. The method includes South African sugpo prawn seed workshop temporary culture, higher-place pond culture management, scallop cage throwing in the higher-place pond and fishing by stages. By combination of factory-like workshop culture modes, the South African sugpo prawns are salinized and temporarily cultured, microecological bacteria are reasonably used in the culture process, waste scallop cages are thrown into the higher-place pond, the sugpo prawns are fished by stages at a late culture stage, the South African sugpo prawns can adapt to high-salinity water, water quality can be ensured at the late high-density culture stage, and the method is of great significance for increase of survival rate at an earlier stage, guarantee of culture water quality and yield improvement.

The invention relates to a stepped weir for a straight river channel. The stepped weir is characterized by comprising a trapezoidal weir and / or a W-shaped weir arranged between a first river bank and a second river bank, wherein the trapezoidal weir and the W-shaped weir are in an isosceles trapezoid and in a W shape, respectively, along the water flow direction in a river channel between the first river bank and the second river bank; symmetry planes of the trapezoidal weir and the W-shaped weir are both overlapped with the central plane of a river width; heights of the trapezoidal weir and the W-shaped weir are both lower than or equal to planes on which the top parts of the first river bank and the second river bank are located; elevations of main body parts of the trapezoidal weir and the W-shaped weir gradually increase along the water flow direction; and at least one recirculation zone is formed in the downstream direction of the water flow. The stepped weir provided by the invention is capable of weakening energy, maintaining the stability of the river channel, increasing a habitat for aquatic organisms and favorably increasing biodiversity of the river channel, and can be widely applied to river channel regulation works.

The invention discloses a preparation for promoting fibroblasts to secrete extracellular matrix components, and a preparation method and application thereof. The preparation comprises the components of A) the egg white of eggs, B) egg white lysozyme, and C) pyruvic acid or pyruvate, can also comprise ovotransferrin and / or glucose, and is obtained by mixing the components uniformly. The preparationcan serve as an externally used paste for skin in application, and can obviously stimulate the secretion of collagen and hyaluronic acid synthase in the fibroblasts of the skin and improve the resiliency and the moisture content of the skin. The preparation is derived from a biologic extractive technique, has no harmful substance residues, safe and high-efficiency use, and is different from the prior method for promoting the secretion of a single fibroblast ECM component; besides, the preparation has multiple effects, wide application range and extensive application prospect, and can be applied in the fields of the preparation of skin substitutes, the preparation of anti-aging skin care products, cosmetics, medical treatment and the like.

The invention discloses desertification control land and a control method thereof. The control method is characterized in that positions of patches (1) and corridors (2) are selected, and the patches (1) are connected together through the corridors (2) to form a matrix (3); the patch-corridor-matrix is a whole which is in continuous connection and development in space, and is used for breaking up the large-area desertification land into parts when being applied to the desertification control land, so as to achieve the control mode of letting one unit guide a whole area, and the distance between every two patches is determined via the size, expansion rate and control cost of the desertification land; a plurality of grooves (4) and (5) are respectively formed in each patch (1) and each corridor (2) and are filled with a mixture (6) of soil and cow manure; grass seeds (8) are sowed in the grooves, and tree seeds (9) are in root cutting or planted in the grooves, and then sand (7) is spread and laid on the surfaces of the grooves sowed with the grass seeds; the arrangement direction of the grooves is required to be vertical to the direction of the dominant wind in winter and spring, which is more conducive to the control effect.

The invention provides a soil conditioner for repairing polluted soil. The soil conditioner is prepared by mixing the following raw materials in percentage by weight: 1-2.5% of a compound microorganism agent, 60-75% of an organic matter, 25-45% of a medium trace element soil conditioner and 5-20% of a macromolecular organic compound, wherein the macromolecular organic compound consists of poly gamma-glutamic acid and humic acid; and humic acid comes from high-quality lignite. The soil conditioner provided by the invention has the effects of improving soil, degrading soil pesticides and residual fertilizers, passivating and fixing farmland heavy metals, reducing adsorption of plants to heavy metals and improving the crop yield and quality, is used for repairing and controlling farmland pollution, and has such remarkable functions of fertilizer supply, soil improvement, soil-ripening progress acceleration, and crop yield and quality improvement.

A three-dimensional ecological floating bed and its water-cleaning method, which is the water cleaning technology in environmental engineering; the said three-dimensional ecological floating bed comprises upper, middle and lower three layers, the upper layer is aquatic plant unit(21), the middle of the central hollow pipe in the upper layer is equipped with overflow water inlet pipe(11), the upper of the hollow pipe is equipped with air inlet pore(2), the top is equipped with drop-down map(9), the lower of the hollow pipe is equipped with water inlet pore(10), shampoo spray is installed in the upper part of the drop-down cap; the middle layer is aquatic animal unit(22), aquatic animal cage(14) is equipped in this layer, perforated board(19) and intermediate water intake loop are equipped in the lower part, sampling pipe(6) is connected with intermediate water intake loop(20); the lower layer is the artificial dielectric unit(23), the artificial dielectric(13) is suspended in the suspending support(12), a bottom support(17) and a bottom water intake loop(18) are equipped in the bottom; a floating bottle(3) is equipped in the peripheral of the ecological floating bed.

The invention relates to a porous rotating spherical polygonal suspension filler which comprises an outer sphere and an inner core.The inner core can rotate in the outer sphere, the outer sphere is formed by connecting two hemisphere frames in a butt-joint mode, each hemisphere frame is composed of three circular ring sheets and multiple sets of support sheets which intersect with the circular ring sheets vertically and horizontally, and the inner core is composed of two soft circular rings, multiple sets of support rods which connect the soft circular rings and soft fiber bundles fixed to the support rods; the circular ring sheets intersect with the support sheets vertically and horizontally to form a fishing net-shaped hollow structure, the circular ring sheets sequentially comprise the first circular ring sheets, the second circular ring sheets and the third circular ring sheets from small to large, each third circular ring sheet on the hemisphere frames comprises an upper circular ring sheet body and a lower circular ring sheet body, and the upper circular ring sheet bodies are connected with the lower circular ring sheet bodies through bolt plugs and bolt plug holes.The hollow filler has the advantages of being large in specific surface area, large in quantity of contained microbial strains, capable of achieving material biodegradation resistance, extremely little in excess sludge, low in preparation cost, convenient to assemble and disassemble and long in service life.

The invention relates to a method for large-quantity propylea japonica indoor raising. Wheat aphids, melanaphis sacchari and corn leaf aphids are used as aphids for feeding propylea japonica, and through specific technical measures such as host young aphid cultivating, aphid expanding propagation and propylea japonica artificial feeding, a large quantity of field-preventing and indoor-theory-study propylea japonica is obtained by expanding propagation. According to the method, wheat aphid feeding is carried out at a larval phase, and wheat aphid, melanaphis sacchari and corn leaf aphid feeding is carried out at an adult spawning period. The nutritional requirements of propylea japonica are improved, and the fecundity of propylea japonica is greatly improved. During raising, corn seedlings are placed, the habitat of propylea japonica is enlarged, space complexity is improved, propylea japonica autotomy and competition are lowered, and raising density can be greatly improved. The method is summarized according to the habit of propylea japonica and is easy to operate, economical and practical. Propylea japonica obtained by expanding propagation is high in survival rate and high in fecundity, and large-scale artificial breeding of propylea japonica can be achieved.

The invention relates to a multi-layer waterweed planting device special for lobster aquaculture. The multi-layer waterweed planting device includes a square basic frame, four support feet are symmetrically welded onto the lower end of the square basic frame; four bases are symmetrically welded onto the upper end of the square basic frame; the four basic bases are welded onto four installation columns; an inner walls of the four installation columns are provided with four linear slide rails; four linear slide columns are arranged on the four linear slide rails; a planting box is welded among the four linear slide columns; first water holes are evenly formed in the center of the planting box; two lifting driving mechanisms are arranged on two sides of the lower end of the planting box; and four side surface planting branch chains are arranged on four end surfaces outside the square basic frame. The multi-layer waterweed planting device can achieve multi-layer waterweed supplying and high yield cultivation in lobster aquaculture, can automatically feed lobsters, is low in lobster aquaculture cost, is high in output value of the lobsters, is good in aquaculture effect, and is high in economic benefits.

The invention provides a lakeside zone ecological improvement technology capable of eliminating waves and promoting sediment deposition. Based on the synthesis of existing related technologies for lakeside zone ecological restoration, in terms of the characteristics of a lakeside zone, a bottom material is improved, the flow rate of a water flow is reduced, and the basic environment conditions of growing and breeding large-scale aquatic higher plants are enlarged; main components used for ecological improvement comprise an underwater sand blocking bank arranged on the lakeside zone and a bamboo raft floating bed arranged at the head region of the lakeside zone; the underwater sand blocking bank is mainly used for blocking a bed load sediment flowing in a lakebed to reduce the flow rate of the bed load sediment and realize quicker settling of the sediment; the bamboo raft floating bed is mainly used for playing roles in eliminating waves, promoting siltation and protecting the sand blocking bank. By designing the combination of the underwater sand blocking bank and the bamboo raft floating bed of the underwater sank blocking bank, the flow rate of the water flow can be reduced, the sediment deposition is promoted, the aquatic higher plants can favorably root for survival, a physical environment which is beneficial for sediment deposition and algae capture and enables nutrient elements such as nitrogen and phosphorus to be accumulated and purified is established, and thus a lakeside zone ecological system is better stabilized to realize the purpose of water quality improvement.

The invention relates to a bio-floating bed and an on-site three-dimensional bio-remediation method for a micro-polluted water body. The bio-floating bed relating in the invention comprises a floating bed body, and a combined biological stuffing is arranged on the floating bed body. Also, plants can be grown on the floating bed body. Efficient microflora obtained by enriching and domesticating bottom sediment of a to-be-treated water body is suspended on the used combined biological stuffing, and has the advantages of being high in biological activity, strong in adaptability and good in treatment effect. The invention further relates to an on-site three-dimensional bio-remediation method for the micro-polluted water body. The method comprises the steps of: covering the bottom sediment of the micro-polluted water body with about 1-2cm coal ash, then spraying the film-suspended biological stuffing on the coal ash by about 1-2cm; then covering the water surface of the micro-polluted water body with the bio-floating bed, wherein the coverage area takes up 10%-20% of the water surface area of the micro-polluted water body. Through the remediation method, the micro-polluted water body can be continuously purified for three to four months.

The invention discloses a method for improving the habitat of native tree species in Karst. The method includes the steps of increasing the total amount of soil, conducting soil management method andperforming legume plant interplanting. To increase the total amount of the soil, a retaining wall is built up around dog bone trees to create a microhabitat suitable for the growth of dog bone wood; the soil management method includes the steps of covering the junctions of trunks and roots of the dog bone wood with weeds or litters, burying covering material into the soil every autumn and then covering again with new weeds, opening a ring-shaped, radial trench around the trees, placing a mixture of soil and water retention agent under the ground of the trench, placing decomposed compost, mud or other fertilizer thereon with other ages of trees not needed to be fertilized, and covering the top with weeds or litters; for legume plant interplanting, soybeans and peanut legumes are interplanted with certain line spacing under a dog bone tree forest, and plant nitrogen fixation is used to increase soil nitrogen content. The method for improving the habitat of the native tree species in Karst has the advantages of being strong in operation, significant in effect, broad in application prospects, and generally suitable for Karst vegetation restoration areas with poor local habitat conditions.

The invention provides a synchronous short-cut denitrification-partial nitrosation-anaerobic ammonia oxidation system for sewage. A reactor in the system is divided into the following communicated areas from bottom to top through partition plates: a short-cut denitrification area, a partial nitrosation-anaerobic ammonia oxidation area and a three-phase separation area. Sewage and nitrate nitrogen-containing reflux liquid enter the short-cut denitrification area, nitrate nitrogen is reduced into nitrite nitrogen through short-cut denitrification bacteria, and meanwhile organic matters are removed; water containing ammonia nitrogen and nitrite nitrogen passes through the partial nitrosation-anaerobic ammonia oxidation area, part of ammonia nitrogen is oxidized into nitrite nitrogen through ammonia oxidizing bacteria, meanwhile, the remaining ammonia nitrogen and nitrite nitrogen are denitrified through anaerobic ammonia oxidizing bacteria. A first partition plate is arranged between thepartial nitrosation-anaerobic ammonia oxidation area and the short-cut denitrification area; the three-phase separation area is used for separating a treated product, and a second partition plate is arranged between the three-phase separation area and part of the nitrosation-anaerobic ammonia oxidation area; the three-phase separation area is provided with a three-phase separator, and reflux liquid obtained after three-phase separation is pumped to the short-cut denitrification area through a reflux inlet.

The invention provides a method and system for nitrogen and phosphorus removal via a WTRs-reinforced tidal-flow reactor, which belongs to the field of water treatment. According to the invention, WTRs is used as matrix, and a tidal-flow reactor is filled with WTRs; deposit is added to realize microbial inoculation of the tidal-flow reactor; and then synthesized waste water with high nitrogen-phosphorus content is added into the tidal-flow reactor, and treatment is carried out. The objective of the invention is to simulate eutrophicated river water and to simultaneously and highly-effectively eliminate nitrogen pollution and phosphorus pollution in the eutrophicated river water. The method and system are characterized in that all the matrix in the tidal-flow reactor is air-dried WTRs with a size of 1 to 3 cm, nitrogen in the tidal-flow reactor is removed mainly through microbial action, and phosphorus pollutants are removed mainly through physical and chemical absorption. According to the invention, the system has a simple structure and is easy to use; materials used in the invention have low cost and are environment-friendly; the method is simple to operate; and while WTRs are recycled, nitrogen and phosphorus pollutants in an eutrophicated water body are removed in virtue of the tidal-flow reactor, so the win-win objectives of waste recycling and ecological restoration are achieved.

The invention relates to a method for controlling blue-algae bloom outbreak of urban landscape water. The method comprises the following steps: for revetment and lake bottom hardened urban landscape water, building a hardened planting pool at a river bank, and planting emergent plants; planting submerged plants in a flowerpot, and sinking the flowerpot to the bottom of the water; and planting floating-leaved plants in the flowerpot, and placing on the bottom of the water. By planting the aquatic plants and ensuring the planting area and biomass of the aquatic plants, the excessive growth and breeding of algae in the water are inhibited, and the blue-algae bloom can be inhibited and eliminated. When the blue-algae bloom outbreak is effectively controlled, the clear state of the water can be maintained, the landscape effect of the water is improved, a good living space and habitat can be provided for bottom inhabiting organisms, a high-density zooplankton colony is formed, and the biological diversity is improved. The potted aquatic plants are easy to replace and manage, and the method has the advantages of simplicity in operation and maintenance, low investment and low energy consumption.

The invention relates to a technology for conditioning a lakeside matrix through biochar and dry reed stems conditioning to strengthen nitrogen and phosphorus removal. The dry mass percent of the charcoal, the dry reed high-temperature cracking stems and the lakeside matrix is (1-5):(0.5-2):(93-98.5). The dry reed stems are subjected to high-temperature cracking to prepare the charcoal, then the charcoal and the dry reed stems are mixed into the lakeside matrix, vascular bundle type aquatic plants are planted on the mixed matrix, and effective removal of lakeside nitrogen and phosphorus is achieved through the synergistic effect of the three. The raw materials, namely the dry reed stems, adopted in the method are cheap and easy to obtain, the technical operation is simple and feasible, andthe technology has the advantages of being low in investment cost, low in energy consumption and the like.

The invention discloses a heavy metal solidification stabilizing agent for polluted bottom mud and a preparation method thereof. The heavy metal solidification stabilizing agent is prepared from the following components: 10 to 15 parts of sodium silicate, 10 to 12 parts of magnesium oxide, 6 to 9 parts of hydroxy carboxylic acid metal chelating agent, 8 to 10 parts of Ca2O2, 18 to 25 parts of CaO,14 to 16 parts of Al2(SO4)3, 8 to 12 parts of FeO, 25 to 30 parts of bone meal, 10 to 14 parts of chitosan, 10 to 13 parts of chitin and 16 to 24 parts of lactic acid; a preparation method of the heavy metal solidification stabilizing agent comprises the following steps: 1) preparing materials; 2) preparing solid particles and grinding; drying ground mixed powder; 3) mixing the treated mixed powder, the bone meal and the lactic acid and pelletizing. According to the heavy metal solidification stabilizing agent disclosed by the invention, a soil framework and a pore structure of the polluted bottom mud is ensured, the releasing of endogenous pollution is reduced, the pH (Potential of Hydrogen) value is regulated, an ecological habitat of substrate microorganisms is improved, and a continuous self-purification capability on overlying water and the endogenous pollution is recovered.

Process for the growing of micro-organism in an open and continuous system further being characterized by means for creating within said system a habitat in which natural, diverse and heterogeneous emicrobial communities can autonomously react and adapt to a changing environment

The invention provides a breeding method of native chickens and belongs to the technical field of poultry feeding. The method includes the following steps that 1, fences are arranged around a logging site, and therefore the chickens are prevented from being killed and lost; 2, the chickens are stocked in daytime and enter henhouses at night; 3, mixed feed is fed every day, and an attractant is added into the feed. A preparation method of the attractant includes the steps that other components except for salted duck egg yolk, peanut oil and rice wine are mixed and smashed into powder, a proper amount of water is added into flour, the materials are heated and stirred into paste, the obtained powder, the salted duck egg yolk, the peanut oil and the rice wine are added into the flour paste, the materials are stirred to be uniform, the materials are pelletized, dried and puffed, and then the attractant is obtained. The formula raw material source of the feed is wide and easy to obtain, the cost is low, the food intake is increased after the native chickens eat the feed, the disease resisting capacity is enhanced, the egg yield is increased, and the egg laying period is prolonged. Eggs laid by the chickens fed through the breeding method of the native chickens contain rich amino acid and microelements necessary for the human body, and the eating value is high.

The invention discloses a flue-cured tobacco cultivation method capable of effectively promoting flue-cured tobacco root growth. The method comprises the steps of tobacco seedling culture, tobacco seedling transplanting and field management. The flue-cured tobacco root growth environment can be effectively improved, proper conditions are provided for elongation growth of flue-cured tobacco roots, the flue-cured tobacco root length density and depth indexes are effectively enlarged, the root structure is optimized, and growth and development of overground parts of flue-cured tobacoo are promoted.

The invention provides a biochar-based organic special fertilizer for watermelons and a production method thereof. The special fertilizer is prepared from the following components in parts by weight:30-40 parts of biochar, 40-60 parts of organic materials, 6-8 parts of nitrogen (N2), 2-4 parts of phosphorus (P2O5), 6-9 parts of potassium (K2O), 10-15 parts of perlite, 1-2 parts of potassium sulfate, 1-2 parts of ammonium sulfate, 0.5-1 part of ammonium nitrate, 0.5-1 part of humic acid, 1.5-2.5 parts of wood vinegar, 1-2 parts of wood tar, 0.05-1 part of a probiotic agent, 0.5-1 part of a fertilizer controlled release agent, and 1-3 parts of a forming aid. The organic matters are solid livestock and poultry manure and decomposed organic plants with the water content of less than or equalto 40%. The preparation method comprises the following steps: carrying out high-temperature pyrolysis on crop straws to prepare biochar, adding the biochar and organic matters into a fermentation tank, carrying out mixed fermentation for 10-20 days, adding an ingredient granulator into the base material, granulating the mixture and finally spraying wood tar onto the granular fertilizer. The special fertilizer contains a large amount of organic nutrient elements, effectively utilizes waste resources, improves sandy soil, is suitable for planting watermelons, and improves taste and yield.

The invention relates to the technical field of ecological management, and provides a reservoir tail hydro-fluctuation belt wetland restoration method based on forest habitat. The method comprises the following steps of S1, selecting saplings: selecting a flooding-resistant large arbor with the height that the tree top can exceed the highest water level by 20-80cm after the tree top is submerged in the highest water level after planting, the large arbor comprises one or more of pond fir, Chinese tipping, taxodium zhongshanha and taxodium falcatum; and S2, planting, wherein planning small-sized trees resistant to water logging along a riparian zone of a reservoir tail hydro-fluctuation belt, and planning the large arbors below small arbors at a certain distance. According to the method, the spatial heterogeneity of the reservoir tail hydro-fluctuation belt is improved, and the original vegetation condition can be quickly and completely recovered after the reservoir tail hydro-fluctuation belt goes through a long-time highest water level environment.

The invention provides a substrate improver for constructing a submerged plant system and a preparation method thereof. The substrate improver is prepared from the following components in percentage by mass: 15 to 30% of a calcium based substance, 10 to 30% of a water purifying agent, 30 to 40% of modified mineral powder, 10 to 20% of diatomite and 10 to 15% of sodium percarbonate. The preparationmethod of the substrate improver comprises the following specific steps: mixing a calcium-based substance, a water purifying agent, modified mineral powder and diatomite according to the formula mentioned above to obtain a first mixture; taking sodium percarbonate taken as a second substance; and putting the packaged first mixture and the second substance into one outer packaging bag to prepare the substrate improver. The substrate improver can decompose pollutants in river and lake substrates, creates a good environment for construction of a submerged plant system, has good effects of purifying a water body and inhibiting blue-green algae outbreak, provides trace elements for growth of submerged plants and can promote rapid construction of a submerged plant system.

The invention provides a high-density soilless loach breeding pond. The high-density soilless loach breeding pond comprises a pond body, wherein a drain hole is formed in the middle of the bottom of the pond body, air stones, filtering plates and a plurality of loach inhabiting box groups are arranged in the pond body, the filtering plates are detachably fixed at the bottom of the pond body, the loach inhabiting box groups are uniformly distributed on the filtering plates, and the air stones are arranged among the plurality of loach inhabiting box groups alternately. The high-density soilless loach breeding pond provided by the invention has the advantages and positive effects that the loach inhabiting boxes can increase loach habitats, the loach breeding density is increased by effectively utilizing a water body space, and loaches are timid in nature, with photophobia, so that the loach inhabiting boxes can provide good habitats for the loaches. As the breeding time goes by, biofilms are attached to the interiors of the inhabiting boxes, so as to provide natural biological bait for the loaches, and purify the water body. The pond is a circulating water breeding pond, and water in the pond can be recycled.