Soil Heavy Metal Pollution Assessment And Warning Study Of Tea Products Area In Karst Mountainous Region

With the rapid development of economy in all parts of the country,and the effect of the industry and agriculture and urbanization development rate of tea producing areas in the remote mountainous areaof Karst has been greatly improved.At the same time,the pollution problems brought about by industrial activities and urbanization are also accompanied by the development and progress.The most prominent is the soil.And because heavy metal pollution are in various forms in the environment of tea producing areas,their environment is polluted.As an important province of tea production in China,Guizhou province is a famous tea producing area.The quality of tea is still good,and the quality of tea depends on the quality of the soil environmental quality in the tea producing area.Therefore,it is of great value for the local society,economy and part management to research the pollution of heavy metals in the soil and carry out comprehensive evaluation and risk early warning research in the environment of tea producing areas.The results of the research are on the prevention and control of heavy metal pollution in the soil,the scientific management of the tea production and the industrialization of tea industry.It is great significance to continue the development.Taking Duyun City as the research object,this paper selects mercury,arsenic,cadmium,lead and chromium as evaluation factors,using GIS spatial analysis technology,using PPC model,entropy weight TOPSIS model,Nemero comprehensive evaluation method,potential ecological hazard assessment method to tea.The pollution status and risk degree of soil heavy metals in the soil of leaf area were evaluated,and the change of heavy metal content and the risk of pollution in the soil of 20 years later were predicted and studied by the scenario prediction model.And some results can be shown that:(1)From the average content,the content of Hg in the soil exceeds the GB II level.The mean values of As,Cd,Pb and Cr are all lower than those of GB II.From the results of correlation analysis and principal component analysis,there was a significant correlation between Hg and As,Pb,Cr,which also reflected the similarity between the two sources in pollution sources,Cd and Hg,As,and no correlation between Pb,indicating that their accumulation and origin in the soil were not relation?(2)In the analysis of semi variance function,Hg,Cd and Cr are exponential models.As and Pb are the best spherical models.In the spatial distribution map,the content of Hg decreased gradually from the east to the surrounding area,and the content of As was low in the East and low in the West;the content of Cd was low in the north of the South;the content of Pb decreased from the northeast to the southwest,and the content of Cr showed a decreasing trend in the east to the West.(3)The PPC model,fuzzy comprehensive evaluation model,entropy weight-TOPSIS model,inner Melo comprehensive evaluation method and potential ecological hazard assessment method are evaluated respectively.The results show that Hg,As and Pb are the most important pollution elements,and the contribution of Hg pollution is the most significant.In the distribution map of comprehensive pollution evaluation under different evaluation methods,it is found that the most serious area of heavy metal pollution is in Yun Dong Town and GUI LAN Shui nationality town ship.So,in the process of soil pollution control,Yun Dong Town and GUI LAN Shui nationality town ship are the key pollution control areas.(4)The situation prediction model was used to study the soil heavy metal content change and pollution risk in the future 20 of the study area.Under the optimistic scenario,the soil environmental quality in the area was better in 2035,and the content of each index element was lower than the national standard II level,and the distribution area above 90% was no alarm.Under the situation of no mutation,the soil Hg pollution in the area in 2035 is more serious,the content is lower than the national standard II standard value,and the large part of the study area is divided.The field is the light police and the police.