云南省者竜—嘎洒地区Cr、Ni地球化学特征及土壤污染风险防控建议

依据云南省者奄—嘎洒地区土地质量地球化学调查数据,研究了表层土壤中Cr、Ni地球化学特征及主要影响因素,分析了农产品Cr、Ni含量特征.结果 表明,研究区表层土壤中Cr、Ni含量受控于地质背景,光山—和平丫口岩体(σ)发育的土壤中Cr、Ni含量明显高于其他地层发育的土壤;不同类型土壤中Cr、Ni含量差异较大,且土地利用...

Cr and Ni geochemistry and some suggestions on soil pollution risk prevention control in the Zhelong-Gasa area,Yunnan Province

Based on the land quality geochemical survey data obtained in the Zhelong-Gasa area,Yunnan Province,the authors studied geochemical characteristics and main influencing factors of Cr and Ni in surface soil and analyzed Cr and Ni content characteristics of agricultural products.The results show that the content of Cr and Ni in the surface soil is mainly controlled by the geological background.The content of Cr and Ni in the soil developed in the Guangshan-Pingyakou rock mass(σ)of the study area is significantly higher than that in other strata.The medium values of Cr and Ni in different types of soils are quite different,and land use also affects the content of Cr and Ni in the soil.The Cr and Ni values of agricultural products such as corn,citrus,tea,sugarcane,bananas,and walnuts in the study area do not exceed the food safety standards.Only the values of 11 rice Cr samples exceed the Cr content standards set by national standards,accounting for 11.3%of the total rice samples.The overall evaluation of agricultural products in this area shows safety.The area of agricultural land such as paddy field,dry land,garden land and grassland in this area is 554.73km²,of which,the area of safety area is 408.61km²,accounting for 73.66%,the area of risk area is 112.96km²,accounting for 20.36%,and the area of control area is 33.16km²,accounting for 5.98%.For some areas with soil Cr and Ni pollution risk,measures are proposed such as soil and water conservation,fertilization adjustment,and water-dry rotation to prevent and control pollution risks.