三峡库区柑橘园土壤环境质量研究

Assessment of the Soil Environmental Quality of the Citrus Orchards in Three Gorges Reservoir Region

对三峡库区4个区(县)柑橘生产果园土壤环境质量分析评价的结果表明,研究区域柑橘产地的土壤环境质量符合NY/T391-2000《绿色食品产地环境技术条件》标准要求,适宜发展绿色果品生产。0～30cm土层全镉、有效态镉的含量显著高于30～60cm土层,说明该区域柑橘园的土壤已受到镉污染;柑橘园0～30cm和30～60cm土壤重金属含量总体无显著性差异,从而说明该区域柑橘园土壤中的重金属源于成土母岩。柑橘园紫色土中有效态镉占全量的百分率高达30.39%,黄壤中有效态镉占全量的百分率仅为2.30%。

The soil environmental quality of citrus orchards in 4 counties of Three Gorges reservoir region was assessed through the soil analysis. According to the standard of NY/T 391-2000 《Environmental technical terms for green food production area》, it is suitable to grow high quality fruit in the area. Analysis indicated that the content of Cd in 0～30 cm soil layer was obvious higher than that in 30～60 cm soil layer; which proved the soil had been polluted by Cd. By multi-factor variant analysis, the heavy metal content was not significantly different between 0～30 cm and 30～60 cm soil layers in citrus orchards. It showed the heavy metal of the citrus soil in the Three Gorges Reservoir Region comes from the rock. The proportion of available content to total content of Cd in the purple soil in the citrus orchards was 30.39%. The proportion of the available content to the total content of Cd in the yellow soil in the citrus orchards was 2.30%.