关键词: 褐化, 褐化

Abstract: In order to comprehend soil environmental quality of vegetable base in Beijing, This paper study the sampling survey on heavy metals including arsenide, mercury, lead, cadmium and chromium in soils of 43 vegetable bases. Through combination method of single factor containment index and Nemerow pollution index, the environmental quality condition of heavy metals of vegetable base in Beijing were evaluated. The results showed that, the average metal heavy content of soils investigated in this study was below the limit value in GB/T 18407.1-2001 safety and quality for agricultural product-environmental requirements for origin of non-environmental pollution vegetable, single contamination index of soil heavy metal was below 1, comprehensive contamination index was 0.257, soil was not contaminated with the soil environment quality standard class 1 at clean level, so the soil was suitable for green vegetable. At the same time, heavy metal content in most monitoring sites was higher than Beijing soil environmental background value. This showed that heavy metals were accumulated in these monitoring sites and chromium content in some vegetable base had come to vigilance level.