| In recent years,Xiayu Park,Sakura Park,Fumin Park,Chunhui Park,Baiyun Park and other community parks in Ningbo have problems such as prominent eutrophication of landscape water bodies and poor application effects of aquatic plants,which restrict the sustainable development of human settlements.It is urgent to repair its water environment.Purifying water bodies with aquatic plants is an ecological and beautiful solution.This study selected 9 kinds of aquatic plants including Canna glauca,Acorus calamus calamus,Pontederia cordata,Lythrum salicaria,Cyperus alternifolius,Arundo donax var.versicolor,Nymphoides peltatum,Hydrocotyle vulgaris,Pistia stratiotes.They are configured with different ornamental characteristics such as ornamental foliage,flowers,and both ornamental foliage and flowers,which can purify different concentration gradients.Quantitative experiments with different plant configurations were carried out in the eutrophic water body（low concentration:COD 50.00 mg/L,NH4+-N 2.50 mg/L,TP 1.00 mg/L;medium concentration:COD 80.00 mg/L,NH4+-N 4.00 mg/L,TP 2.50 mg/L;high concentration:COD 160.00 mg/L,NH4+-N 7.00 mg/L,TP 4.50 mg/L）,summarize the optimization of aquatic plants with good purification effects Configure and upgrade the design of the water plant landscape of the Ningbo community park in order to provide a scientific basis for the practical application of the water plant in the community park landscape.The research conclusions are as follows:1.The water purification effect of plant combination shows that each aquatic plant combination has an obvious intervention effect on the removal of COD,NH4+-N and TP.Each group has a positive effect on COD removal in water.Acorus calamus+Pistia stratiotes,Arundo donax var.versicolor+Nymphoides peltatum,Pontederia cordata+Nymphoides peltatum combination respectively with low,medium,high 3 concentration gradient of NH4+-N in water purification effect is best,The removal rate reached 92.51%,91.87%and 88.31%,respectively.Pontederia cordata+Arundo donax var.versicolor,Pontederia cordata+Arundo donax var.versicolor+Nymphoides peltatum,Lythrum salicaria+Hydrocotyle vulgaris combination respectively in low,medium and high concentration gradient of the 3 TP in water purification effect is best,removal rate reached 97.03%,79.76%and86.95%respectively.According to membership function comprehensive analysis,Pontederia cordata+Arundo donax var.versicolor,Pontederia cordata+Arundo donax var.versicolor+Nymphoides peltatum,Lythrum salicaria+Hydrocotyle vulgaris combination respectively in low,medium and low nutrition,water purification works best as a whole.2.According to the experimental results and the current problems of water quality and landscape in community parks,some Suggestions for optimizing the landscape configuration of water plants were put forward.Among them,Xiayu Park can be arranged as follows:Pontederia cordata+Nymphoides peltatum,Acorus calamus+Cyperus alternifolius,etc.;Sakura park can be arranged as follows:Lythrum salicaria+Canna glauca+Hydrocotyle vulgaris,Acorus calamus+Pistia stratiotes,etc.;Fumin Park can be arranged as follows:Lythrum salicaria+Canna glauca+Hydrocotyle vulgaris、Acorus calamus+Cyperus alternifolius+Pistia stratiotes,etc.;Chunhui park can be arranged as follows:Arundo donax var.versicolor+Nymphoides peltatum、Cyperus alternifolius+Pistia stratiotes,etc.;Baiyun Park can be arranged as follows:Acorus calamus+Cyperus alternifolius+Pistia stratiotes;Lythrum salicaria+Hydrocotyle vulgaris,calamus+Cyperus alternifolius;Baiyun Park can be arranged as follows:Cyperus alternifolius+Acorus calamus+Pistia stratiotes、Lythrum salicaria+Hydrocotyle vulgaris,etc.. |
