区域绿色小杂粮产地土壤质量评价——以山西省长治市为例

长治市13个县(市)的杂粮产地土壤质量监测和评价结果表明:产地92个样点的综合污染指数均小于0 7,污染等级属安全级,污染水平属清洁水平。土壤有机质含量>15g/kg(Ⅰ级)的占52 17%;10～15g/kg(Ⅱ级)的占33 70%;<10g/kg(Ⅲ级)的占14 13%。土壤全氮含量>1 0g/kg(Ⅰ级)的占32 61%;0 8～1 0g/kg(Ⅱ级)的占28 26%;<0 8g/kg(Ⅲ级)的占39 13%。土壤有效磷含量>10mg/kg(Ⅰ级)的占26 09%;5～10mg/kg(Ⅱ级)的占32 61%;<5mg/kg(Ⅲ级)的占41 30%。土壤有效钾含量>120mg/kg(Ⅰ级)的占91 30%;80～120mg/kg(Ⅱ级)的占7 61%;<80mg/kg(Ⅲ级)的占1 09%。土壤质量整体状况良好,适宜发展A级绿色食品。

Soil Quality Evaluation of Mixing Organic Crop Cultivation—A Case Study on Changzhi City of Shanxi Province

The soil quality of food grains other than rice and wheat production base located 13 counties (city) of Changzhi were analyzed and evaluated. The result showed the comprehensive pollution indices of 92 samples from the base of food grains other than rice and wheat, smaller than 0.7, reached the safe grade,soil organic content in the samples > 15 g/kg (Ⅰ grade) accounted for 52.17%; 33.70% of samples were 10～15 g/kg (Ⅱ grade); 14.13% of the samples were < 10 g/kg (Ⅲ grade). The whole nitrogen content in the soil >.0 g/kg (Ⅰ grade) accounted for 32.61%; 28.26% were 0.8～1. 0 g/kg (Ⅱ grade); 39.13% were smaller than 0.8 g/kg (Ⅲ grade).Effective phosphorus content in the soil > 10 mg/kg (Ⅰ grade) accounted for 26.09%;32.61% were 5～10 mg/kg (Ⅱ grade);41.30% were smaller than 5 mg/kg (Ⅲ grade). Effective potassium content > 120 mg/kg (Ⅰ grade) accounted for 91.30%; 7.61% were 80～120 mg/kg (Ⅱ grade); 1.09% were smaller than 80 mg/kg (Ⅲ grade).The soil quality was good, suitable for developing pollution-free food of A grade.