Thursday, 13 July 2006
66-3

Soil Quality Evaluation for Green-Food Production Suitability in Beijing Plain Area.

SUN Danfeng, College of Resources and Environmental sciences, China Agricultural Univ, No 2, Yuan Ming Yuan Xi Lu, Beijing, China and Li Hong, Institute of Agricultural Integrated Development, Beijing Academy of Agriculture & Forestry Science, Banjin Rd, Beijing, China.

The demand of human health drives the green-food production, in which the soil quality has an important role. The soil quality evaluation for green-food production should be an integrated assessment of the climate, soil, irrigated water quality and landscape. Taken Beijing plain area as a case, this study established soil quality assessment model for green-food production. The model adopted quality index evaluation method to divide 3 classes from the first class (superior quality for green-food), the second class (medium quality for green-food) to the third class (inferior quality for green-food), and 0 class to indicates the no meaning areas (for example the city areas). The evaluation includes the calculations of climate quality index, soil quality index and water quality index individually and the three indices integration using equal weight sum to measure the quality of soil resource. And then the evaluated class was adjusted to further consider the influences of surrounding landscape. The adjusted was based on the distance from the resident areas and/or industry sites to measure the influences of human activities negative impacts. Considering the data accessibility, the accuracy and extent in Beijing plain areas, the climate quality index mainly calculated the growth length of water-heat, the injurant gases/dust, and soil quality index was integrated on the soil productivity indicator (surface texture, soil profile, soil organic and CEC) and soil environmental indicator (surface pH, Pb, Cd, Cu, Cr, As, Hg, the residual pesticides). The water quality index followed the China national groundwater quality standard (GB/T14848-93) to select 18 attributes to calculate. The index threshold value adopted the China national standard of green-food production base environmental technology conditions (NY/T391-2000). The model was primarily tested in Beijing plain area (6 counties) and has the high operational ability. The first class has only 9.49% Beijing plain area, the second class 26.71% and 63.8% areas which were not suitable for green-food production.

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