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定西地区主要农业土壤中铜、锌、钼、铁、锰、硼、铅、汞、镉、铬、镍、钴、砷等13种微量元素,既有作物必须的营养元素,又有有毒元素。研究它们在农业土壤中的背景值,对农业环境研究、地方病因的探讨、掌握微量养分贮量有着重要的现实意义和深远的历史价值。本文根据1988～1991年定西地区主要农业土壤中13种元素调查的结果,探讨其分布规律、刍议成土母质、土壤类型、土壤有机质等自然环境对其规律的影响。
There are 13 kinds of trace elements, such as copper, zinc, molybdenum, iron, manganese, boron, lead, mercury, cadmium, chromium, nickel, cobalt and arsenic in the main agricultural soil in Dingxi area, as well as the necessary nutrients and toxic elements in existing crops. Studying their background value in agricultural soils has important practical significance and far-reaching historic value for the study of agricultural environment, the study of local etiology and the storage of trace nutrients. Based on the survey results of 13 elements in main agricultural soils in Dingxi County from 1988 to 1991, the distribution of 13 elements in the main agricultural soils of Dingxi area was discussed, and the influence of the natural environment such as soil parent material, soil type and soil organic matter on its regularity was discussed.