甘肃省陇东塬区土壤及农作物中微量元素的分布特征

通过测定甘肃省陇东塬区马岭、西峰和华庆油田区土壤以及小麦、苹果、油菜中Cu、Ni、Cd、Pb、Cr、Zn等6种微量金属元素质量分数,研究塬区土壤中微量元素的空间分布特征及其在植物体内的转移、富集能力.结果表明:塬区土壤中w(Zn)明显高于其他5种元素,其平均值达111.64 mg/kg;w(Cd)最小,在1.64～3.38 mg/kg之间;其余4种元素(Cr、Pb、Ni、Cu)质量分数在20～70 mg/kg之间.当地主要农作物对土壤中微量元素的富集系数均小于1,富集能力一般,其中根部的富集能力相对较大,地上部位均较小. 

Distribution Characteristics of Several Trace Elements in Soil and Crops in Longdong Tableland Plateau,Gansu Province

The spatial distribution of six trace elements(Cu,Ni,Cd,Pb,Cr and Zn) in soil,and their transfer and enrichment in crops,were studied by investigating their contents in the Maling,Xifeng and Huaqing oilfields in the Longdong tableland plateau and in wheat,apple and rape crops.The results showed that the mean content of Zn in the soil was 111.64 mg/kg,which was the highest among the six elements in the tableland plateau.The content of Cd in the soil was 1.64-3.38 mg/kg,while those of the other four elements were between 20 and 70 mg/kg.The crop enrichment coefficients of all the trace elements were less than 1,which indicated a normal enrichment ability of these crops.Furthermore,the enrichment ability of the roots was higher than that of the plant part above ground.