Study On Plant Configuration Design Model For Landscape Ecological Restoration Of Oil-polluted Coastline In Jiaozhou Bay

As the coastal shoreline oil pollution problem has attracted widespread attention at home and abroad,how to repair the damaged coastal shoreline ecological environment has become a hot issue at present.The treatment of oil-polluted coastal shorelines not only needs to consider environmental engineering schemes,but also needs to be supplemented with ecological restoration methods to gradually restore the structure and function of damaged coastal ecosystems,and eventually develop in a virtuous circle.This study attempts to study four typical natural plant communities along the shoreline of the Jiaozhou Bay.Through field survey sampling,laboratory analysis,and classical statistical methods,Study on the diversity pattern of four natural plant communities including Phragmites australis,Suaeda salsa,Setaria viridis,and Typha orientalis?Analyze the characteristics of four types of natural plant communities and the concentration of petroleum pollution in the soil along the shoreline of the Jiaozhou Bay,and summarize the configuration patterns of the resistant natural plant communities that are suitable for the region.In this study,the natural plant communities and soil conditions in the typical oilpolluted coastline area of Jiaozhou Bay were investigated in the first place to determine the sample plot and survey scope and preliminarily grasp the status quo of oil pollution and plant community growth characteristics in the study area.Secondly through actual investigation sample area soil samples from the field to carry out the soil petroleum hydrocarbon(TPH)determination of content and soil salt,PH value of the quantitative analysis of the laboratory experiment,according to the infrared spectrophotometry for determination of the requirements in soil content of the basic operation method,full of sample to measure oil content in the soil and the average content.Again on the basis of oil pollution in the study area of jiaozhou bay coastline actual oil pollution of soil and typical natural plant community growth situation from two aspects of analysis and research,based on the plant community diversity index and make contrast analysis of plant communities under the stress of different grades of oil pollution,the growth of the change,select suitable for jiaozhou bay coastal shoreline environment of petroleum hydrocarbon petroleum contaminated soil resistance type of plant or potential ecological benefits of plant,the design is suitable for the jiaozhou bay coastline oil pollution repair of the ecological landscape plant configuration scheme.Finally,the ecological system of the oil-polluted sites along the jiaozhou Bay coastline can be recycled and purified naturally.It provides basis for the protection of natural plant communities in oilcontaminated areas and the design of plant configuration in site ecological restoration measures.Conclusions as below:(1)A total of 74 species of plants were found by investigating 64 plots of natural plant communities in the oil-polluted areas along the Qingdao coastline.It belongs to 12 families,among which Chenopodiaceae,Gramineae and Asteraceae are dominant families,accounting for 9.09%,20.45% and 38.63% respectively.The Phragmites australis community,Suaeda salsa community,Typha orientalis community,and Setaria viridis community are all herbaceous vegetation,the species composition is relatively simple,and most of them are in the form of single-good community patches.(2)The Shannon-Wiener diversity index,Pielou evenness,and Simpson domi nance index are the largest in the reed community,which are 1.444,0.602,and 0.981,respectively.The Patrick richness index Is Suaeda salsa community>Typha orientalis community>Setaria viridis community>Phragmites australis community,r espectively :0.997,0.911,0.846,0.877,and 0.794.(3)According to the data analysis results,the average total salt content in the petroleum-contaminated area along the coast of Jiaozhou Bay was 0.626%,the average p H was 8.066,and the average petroleum hydrocarbon content was 69.306 mg/kg.Different plant community types showed that the total salt,p H,and petroleum hydrocarbon content in the soil along the shoreline of the Jiaozhou Bay were the main factors affecting the distribution of plant community types in the region(P <0.05).The impact of community type distribution was extremely significant(P <0.01).(4)In the growth conditions of natural plant communities,it is necessary to consider not only the site affected by saline-alkali stress,but also the industrial pollution caused by urban development.Among the four typical natural plant communities in this study,the Phragmites australis community can clearly show the advantages in the site.In the ?-? level of oil pollution environment,the indicators can basically reach the best,followed by the Suaeda salsa community and Typha orientalis community.The Setaria viridis community appears frequently but has the weakest dominance.In the soil environment of Grade ? and Grade ? petroleum pollution,the indicators of Suaeda salsa community and Typha orientalis community are better and more stable,which are more suitable for the environment.As a whole,the tolerance degree of petroleum hydrocarbons is Phragmites australis community > Suaeda salsa community > Typha orientalis community > Setaria viridis community.(5)Based on the plant survey and analysis of plant community diversity indicators in the Jiaozhou Bay petroleum-contaminated coastline research area,suitable plants in different oil pollution levels of the Jiaozhou Bay petroleum-contaminated coastline were screened in accordance with the principles of ecological landscape plant allocation in thisstudy.There are 15 species in total.Combined with the exploration of different types of oil pollution environment to carry out ecological landscape plant configuration design patterns,a total of four types of six types of plant configuration patterns were designed for the environment of four different levels of oil pollution.