Application Research On Aquatic Plants Restoring Ueban Landscape Water Body

Urban landscape water bodies mainly refer to the waterscapes of parks,residential areas and public places.With the acceleration of urbanization,people have higher and higher requirements for the quality of urban landscape water bodies.However,for urban landscape water bodies,whether formed naturally,It is also constructed artificially,and generally has problems such as closed waters,no water in and out,no flow of water,easy breeding of mosquitoes and flies,easy to cause eutrophication of water,and even black odor,and its water body is increasingly urgent to repair.According to the requirements of"Ground Surface Water Environmental Quality Standard GB3838-2002",the general landscape waters should meet Category V water quality,namely chemical oxygen demand?COD??40mg/L,ammonia nitrogen?NH4+-N??2mg/L,total phosphorus?TP??0.2mg/L,total nitrogen?TN??2mg/L.This article is aimed at shallow-water urban landscape waters,taking the removal of COD,TN,TP,NH4+-N as the evaluation criteria,and combining single-factor analysis of variance,multi-factor analysis of variance and other evaluation methods.Aquatic plants+floating plants+aquatic animals)and the combination of microorganisms selected by the members of the research team for joint repair,combining laboratory tests and field tests,and conducting aquatic plants screening experiments,density orthogonal optimization experiments and field tests The restoration test finally achieved the purpose of reducing the content of nitrogen,phosphorus and other pollutants in the urban landscape water body.Research indicates:?1?Four submerged plants?Ceratophyllum demersum L.,Myriophyllum verticillatum L,Elodea canadensis Michx.,Hydrilla verticillata?Linn.f.?Royle?,Ceratophyllum demersum L.has the best repair effect;4 floating plants?Nymphoides indica?L.?O.Kuntze,Hydrocharis dubia?Bl.?Backer,Pistia stratiotes L.,and locust among the leaves of Salvinia natans?Linn.?All.?,Nymphoides indica?L.?O.Kuntze has the best repairing effect;among four species of aquatic animals?goldfish Carassius auratus Linnaeus,koi Cyprinus carpio haematopterus,Chinese round snail Cipanopaludina chinensis Gray,and river ling Corbicula fluminea?,Tianluo repair effect is the best.?2?The difference of submerged plant species on NH₄⁺-N is significantly different?p<0.05?,the difference on TP is extremely significant?p<0.01?,and there is no significant effect on COD,TN,DO?p>0.05?;Floating plant species have extremely significant effects on TP,NH₄⁺-N,and pH?p<0.01?,significant differences in COD changes?p<0.05?,and no significant differences in TN and DO?p>0.05?;There was a significant difference in TP change?p<0.05?,and a significant difference in COD change?p<0.01?.?3?In goldfish algae?2.5g/L,5g/L,7.5g/L?,one leaf lotus?0.75g/L,1.5g/L,3g/L?,field snail?0.5g/L,1g/L,1.5g/L?.In the orthogonal optimization of the density after matching,the density of the three aquatic plants and plants has an interactive effect on COD,TN,NH₄⁺-N?p<0.05?,and affects TP No interaction?p>0.05?;the combination of 2.5g/L goldfish algae+3g/L a leaf lotus+0.5g/L field snail has the best effect on the restoration of the urban landscape water body,its COD,TN,TP,NH₄⁺-N The removal rates were:55.6%,57.8%,49.5%,51.3%??4?The combination of 2.5g/L goldfish algae+3g/L one leaf lotus+0.5g/L field snails is used in the on-site restoration of the urban landscape water body,and the restoration effect is better.COD,TN,TP,The removal rates of NH₄⁺-N were73.15%,24.79%,84.01%,and72.72%,respectively.