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Development of Soil Heavy Metals Information System:a case study on Beijing

CHEN Huang, ZHENG Yuan ming, CHEN Tong bin(Laboratory of Environmental Remediation, Institute of Geographic Sciences and Natural ResourcesResearch, CAS, Beijing 100101, China)  
The progress and advancement in Soil Information System (SIS) are reviewed in the paper. The status of heavy metal contamination in surface soil showed that it was necessary to develop soil databases of heavy metals as a new special kind of SIS. Such SIS was named Soil Heavy Metals Information System (SHMIS). It was composed of Soil Heavy Metal Database (SHMD) and Soil Heavy Metal Management Information System (SHM MIS). The SHMIS could be used to investigate the concentrations of heavy metals in soils, and its spatial distribution and spatio temporal variation. The paper describes the structures and functions of the database. All kinds of useful data were classified into forty two fields in six tables,which were related with a key field named SID (Soil samples ID).And the data integrity can be checked and controlled with DBMS. These data stored information, e.g., basic geographic attributes around sampling areas,concentrations of heavy metals of soil samples,spatial relationships between sampling areas and geographic conditions, the growth status of sampling areas, etc. A kind of MIS named SHM MIS was developed to manage the information. Under the circumstances of SHM MIS, data could be browsed, edited, analyzed, and queried according to the identification of users. Assisted with this database, the sampling procedure would process step by step, i.e. , followed stage of sampling would be directed with spatial analysis based on the data management of database so that the information of sampling could reveal the spatial distribution of heavy metals in soil with proper density of sampling. Furthermore, this database can support many other researches about heavy metals of soil, such as risk evaluation.
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