Research And Implementation Of Risk Assessment System For Heavy Metal Contaminated Cultivated Land

Soil environment as an important part of the whole environment system, also it is one of the basic elements for the survival of mankind, However, with the development of industrialization and urbanization, the soil environment was affected by activities badly, and the soil environment suffered pollution and destruction seriously, The arable soil is a type of the soil, which was influenced by human activities, in the mining area and the surrounding areas, the pollution that come from mining activity has made the quality of soil environment suffer damage seriously, The arable soil in mining area was contaminated by heavy metals pollution mainly, whose latency, crypticity and difficult to control makes arable soil easy to be polluted, what is more, the heavy metals that was accumulated by crops threated human health through food chain, Therefore, it is important for evaluation and control to arable soil heavy metal pollution in mining area to design the platform about assessment to agricultural utilization risk and control for heavy metal pollution arable soils with the aid of the GIS and professional theory of environmental science.In this paper, we studied the assessment models and methods which were used in the research of the soil heavy metal pollution, and selected the assement models and methods in our platform, which includes single factor index evaluation method, Nemoro comprehensive pollution index evaluation method, the potential ecological risk index method, etc, The paper put forward the comprehensive evaluation of soil heavy metal pollution model based on analytic hierarchy process accord to the properties of arable soil in mining area, and combined the research on the control methods for arable soil heavy metal pollution that were thought as professional theoretical foundation of the platform design, This paper also introduced the GIS technology and the component type of GIS design means, and designed the platform about assessment to agricultural utilization risk and control for heavy metal pollution arable soils with the help of ArcGIS Engine, Visual platform and the evaluation models, professional theory of environment pollution control methods, The platform main features are:the basic function of geographic information system, using the evaluation models and methods to evaluate the soil heavy metal pollution, the soil heavy metal pollution situation regional spatial interpolation prediction, arable soil pollution situation of attribute information and spatial information quering and editing, to come up with the control methods according to the soil situation of heavy metal pollution, etc.