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通过对陕西南部大巴山地区的基岩、土壤、作物、泉水及地表水中含碘量和分布规律的研究 ,发现本区环境中碘的分布很不均衡 ,变化较大 ,包括从极低碘到高碘的多种情况 .本区主要分布的早古生代地层均富碘 ,岩石的含碘量为 0 .7～ 1 .9mg/kg .在山坡坡度较缓的基性火成岩分布区的基岩、土壤、作物均富碘 ,一般为 1 .4～ 0 .9mg/kg .土壤的含碘量为 0 .2～ 2 .2mg/kg ;土豆的含碘量为 8～ 1 80 μg/kg .由于长期的风化剥蚀 ,大巴山区大多数地区的土壤和作物缺碘 ,特别是碳酸盐岩分布区以及高大山头上部的土壤和作物均缺碘 .土壤和作物中含碘量与其分布区的基岩的岩性和含碘量以及地理环境密切相关 ,同时本区克汀病的分布和发病率与环境中碘的含量和分布也密切相关 .
Based on the study of iodine content and distribution in bedrock, soil, crop, spring water and surface water in the Dabashan area of southern Shaanxi Province, it was found that iodine distribution in the area was uneven and varied greatly, ranging from extremely low iodine to High iodine in many cases.The pre-Paleozoic strata mainly distributed in this area are rich in iodine, the iodine content of rock is between 0.7 ~ 1.9mg / kg. In the bedrock of the basic igneous rock distribution with gentle slope, Soil iodine, crops are generally 1 4 ~ 0 .9mg / kg. Soil iodine content of 0.2 ~ 2.2mg / kg; iodine in potatoes is 8 ~ 1 80μg / kg. Due to Long-term weathering and erosion, the lack of iodine in soils and crops in most parts of the Daba Mountains, especially the carbonate distribution areas and soils and crops in the upper part of the high mountains are iodine deficiency. The bedrock of iodine content and its distribution in soil and crops Lithology and iodine content as well as the geographical environment is closely related to the area cretinism distribution and incidence and the environment is closely related to the content and distribution of iodine.