45results about How to "Increase species diversity" patented technology

The invention discloses a method of using native plants to control growth of exotic ageratum conyzoides, which includes: selecting sample plots from abandoned lands suitable for growth of ageratum conyzoides, eradicating various plants in the sample plots, digging planting pits, mixedly planting xanthiumsibiricum, amaranthus paniculatus, polygonum orientale and chenopodium album into the plantingpits, interplanting the ageratum conyzoides among the former plants, and performing the cycle for interplanting. The xanthiumsibiricum, the amaranthus paniculatus, the polygonum orientale and the chenopodium album are all resistant to allopathic stress from the ageratum conyzoides, and can be mixedly planted to inhibit growth of the ageratum conyzoides and resist its invasion. The method has the advantages that the plants used in the method are all native and easy to propagate and grow fast, revegetation is short, exotic weed control is effective, management is easy, no ecological risks occurand the like.

The invention relates to a method for preventing and controlling migration of heavy metal pollutants in uranium tailings by plants. Five plants, namely Rhus chinensis, Trema orientalis, Buddleja officinalis, Melilotus officinalis and Pouzolzia zeylanica which have strong drought resistance and can retain different heavy metals are planted in a matching way, and applied with plant carbon and phosphate fertilizer at the same time so as to establish vegetation in a uranium tailings polluting area in a short time. Through reestablishment of the vegetation, the nitrogen content of the polluted soil is obviously increased, and the contents of the water-soluble heavy metals such as uranium are obviously reduced. The plants selected by the method are all planted locally, so the materials are easily taken, and the plants are easily planted and quickly grown; moreover, the method has the advantages of having good efficiency for controlling pollution, improving the soil, beautifying the environment, and the like. The method can be used for controlling heavy metal pollution and reestablishing vegetation of various mine degraded ecosystems.

The invention discloses a method for arranging a movable wheat sand-protecting barrier on a moving dune. The method for arranging the movable wheat sand-protecting barrier on the moving dune comprises the steps that a ditch is formed in the moving dune in rainy seasons, wherein the ditch is deep enough to reach the wet sand layer; wheat seeds are evenly sown on the wet sand layer; the wheat seeds are covered with sand; the movable wheat sand-protecting barrier is formed after wheat grows. By the adoption of the method for arranging the movable wheat sand-protecting barrier on the moving dune, the sand stabilizing function can be achieved through the movable sand-protecting barrier, environmental friendliness and economical efficiency are achieved, the method is simple, the survival rate is high, and the storage life is long.

The invention provides a biofilm pretreatment device for polluted raw water purification. The reactor main body is provided with a water inlet pipe, an inlet water drainage area, a sediment sedimentation area, a dredge pipe, a separation net, a hung filler area, a suspension filler area, an elastic filler, a combined filler, a suspension filler, a suspended matter blocking screen, a splitter plate, a drainage plate, a treatment unit, a downstream diversion area, an aeration pipe, an elastic filler zone, an overflowing net and a water outlet pipe. Through combination of different types of fillers and distribution methods, a microbial biofilm attachment environment and microbial type diversity are improved. The biofilm pretreatment device is conducive to systematical, economic and effective removal of nitrogen and organic matters in raw water and reduction of turbidity of the raw water, breaks the limit of biological aeration tank carrier density close to that of water, solves the problem that the suspended biofilm carrier is not easily deposited on the bottom of the reactor and cannot fully perform cleaning effects, improves pollutant removal efficiency, effectively reduces an aeration cost and a running cost of the later raw water treatment process, and reduces a potential disinfection by-product generation risk.