Study On Soil And Water Quality And Wetland Plant Landscape In First Phase Of Haizhu Wetland

Taking the first phase of Haizhu National Wetland Park as the research object,field investigation,laboratory analysis and indoor simulation test were carried out in this paper.Wetland plant landscapes were systematically analyzed by combining with the wetland plant landscape design principles.Aimed at some deficiencies,optimization suggestions were made and putted forward to provide scientific basis for future urban wetland plant landscape design.Conclusions were as follows:?1?There were 22 species,44 genera,and 22 species of vascular plants in the survey area of the First Phase of the Haizhu Wetland.Among them,there were 19families,41 genera and 43 species of seed plants,3 families,3 genera and 3 species of ferns,and 2 species of invasive plants?Pistia stratiotes,Eichhornia crassipes?.The dominant families were Araceae,Marantaceae,Cannaceae,Zingiberaceae;the dominant species were Thalia geniculata,Thalia dealbata,Hedychium coronarium,Canna indica.?2?By monitoring the water quality of Haizhu wetland,results found that there were some differences in the quality of water under different communities with time and space.The water temperature,pH and the concentration of DO had little changes.The concentration of TP,TN,NH₄⁺-N and COD were lower in the communities of Thalia dealbata+Cannaindica-Vallisneria natans,Canna indica+Acorus calamus-Vallisneria natans,Thalia dealbata+Cyperus alternifolius-Vallisneria natans,Arundo donax var.versicolor+Hydrocotyle vulgaris-Vallisneria natans,so the water quality was better.?3?The soil in Haizhu wetland belonged to the fine soil.In the same depth,soil pH,soil organic,total nitrogen,total phosphorus,total potassium,available nitrogen,available phosphorus and available potassium contents varied at different place.Canna indica+Acorus calamus-Vallisneria natansand,Thalia dealbata+Cyperus alternifolius-Vallisneria natans had a great influence on soil fertility.The content of trace elements in soil was relatively high.The content of total amount Cu,Zn,Cd,Cr,Pb,Ni and Hg were different in each sample point.Arundo donax var.versicolor+Hydrocotyle vulgaris-Vallisneria natans,it was value of each index was lower,which had better purification effect on soil.?4?The indoor simulation test was carried out with Haizhu wetland soil and water conditions.The test investigated ten plant communities.TP,TN,NH₄⁺-N and COD concentration dued to the soil and plant nutrient element releasing,the concentration of 7 days was large.With the work of plants purification,the concentration of these four indicators in water decreased gradually.Until the end of the experiment,Thalia dealbata,Canna indica,Hedychium coronarium,Myriphyllum verticillatum and Pistia stratiotes growed well;Pistia stratiotes,Hydrocotyle vulgaris,Myriphyllum verticillatum and Vallisneria natans increased.This was in accordance with the results of the field water and soil quality survey.?5?According to the investigation of Haizhu wetland of a plant landscape showed:rich wetland plant species,charateristic of Lingnan culture,rich plant configurations,but there had some in lackes,such as the common species is too concentrated,invasive plant overgrowth,excessive vegetative growth,poor maintenance and management.In order to solve these problems,this paper puts forward some optimized suggestions.