Research On Soil Heavy Metal Pollution Evaluation And Digital Management Based On WebGIS In Dangshan Nature Reserve

Heavy metal pollution in the soil not only damages the ecological environment,affects production and life,but also threatens human health.The timely and scientific evaluation of the soil environment is conducive to the effective development of pollution prevention and control work.The Dangshan Pear Germplasm Resources Provincial Nature Reserve has abundant pear tree germplasm resources,precious ancient and famous trees,a perfect wetland ecosystem of the Yellow River,and diverse biological species.Therefore,the requirements for soil environmental quality in the protected area are very high.However,the traditional management method consumes a lot of time,manpower and material resources,and the effect is not satisfactory.In order to effectively protect the germplasm resources of Dangshan Pear,maintain the integrity of the ecosystem,achieve sustainable use of biodiversity and resources,and improve the efficiency of the economic industry,this paper carried out the research on the evaluation and digital management of soil heavy metal pollution in Dangshan Nature Reserve based on WebGIS.The main contents of this paper are as follows:(1)The evaluation criteria and research methods for soil heavy metals were determined.Taking the risk screening value in the newly issued agricultural land pollution risk control standard as the research standard,the four evaluation methods are comprehensive single factor index method,Nemero comprehensive pollution index method,ground accumulation index evaluation method and potential ecological hazard index method.The evaluation of soil pollution from different levels ensures the scientific,rational and effective evaluation results.(2)The evaluation and analysis of soil heavy metal content in the study area was carried out.The average pH value of the study area was determined to be 7.8,and the content of each heavy metal element did not exceed the national standard.The soil quality of the protected area was not polluted,and the coefficient of variation was between 10%and 100%,which was moderately variable,indicating that the study area was compared by external disturbances.Obviously,attention needs to be paid to the impact of human activities.Through the single factor index method,Nemero comprehensive pollution index method,ground accumulation index evaluation method and potential ecological hazard index method,the four methods of soil heavy metal pollution in the study area were comprehensively analyzed and evaluated,and the evaluation results were all non-polluting grades.The judgement determined that the soil quality in the study area was good and pollution-free,and the ecological environment was stable.(3)Established a WebGIS-based soil heavy metal pollution assessment and digital management system.According to the needs analysis,the system architecture and functional modules are clarified.At the same time,the database is rationally designed,and the digital management subsystem and the soil heavy metal pollution assessment subsystem are established.The digital management subsystem is convenient for daily management of protected areas,supporting single plant identification operations of fruit trees,establishing a map database for precious ancient trees,uploading and modifying data in real time,including map basic operation functions,layer control functions,and measurement.Function,resource management function,spatial query function,chart analysis function and map printing function;the soil heavy metal pollution evaluation subsystem combines ECharts chart visualization function and inverse distance weight space interpolation method to realize the evaluation result display and analysis of each evaluation method.Users bring a good interactive experience,and provide reference for the development of relevant decision-making and measures.In this paper,the soil heavy metal pollution in the protected area is analyzed by various evaluation methods,the pollution level is determined,the decision reference and implementation basis are provided for the prevention and control work,and the soil heavy metal pollution evaluation and digital management system based on WebGIS is constructed.The evaluation result will be evaluated.Combine the chart to visualize on the webpage,realize efficient,accurate and intuitive analysis and evaluation display,and participate in the daily management of the protected area by digital information technology,improve the supervision level of the protected area,enhance the auxiliary decision-making,and protect The prevention and control of heavy metal pollution in the soil of the area is of guiding significance.