Abstract: Human exposure to potential toxic pollutants and the associated health risk is a focus of current environmental and medical studies. However, the transfer and partitioning of the pollutants in the soil crop systems turns to be a key problem for evaluating the food intake of the pollutants. This paper deals with the methodology and the approach of computer modeling of the soil crop partitioning of the pollutants under agricultural systems for human food security and the elaboration of guidelines for soil protection. Two major models, crop ecological model and soil environmental chemical model, are discussed respectively. These models may be valuable for the research of agricultural environment protection and the development of guidelines for soil protection in China.

Key words: Soil crop system, Potentially toxic pollutants, Food security, Soil protection guidelines, Modeling, endangered plant, Acer catalpifolium, shade, provenance, photosynthesis