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通过对海南岛上万名学龄前儿童头发钙含量以及所处地域农耕旱地土壤交换性钙的调查与分析发现：土壤钙与儿童头发钙含量呈极显著正相关；海南岛儿童头发钙均值低于国内其它地方的报道值；土壤环境钙含量的高低，能间接反映人体钙的营养状况。
Through the survey and analysis of calcium content in the hair of thousands of pre-school children in Hainan Island and the exchangeable soil calcium of the dry farmland in the area, the calcium content of soil calcium has a very significant positive correlation with the calcium content in the hair of children in Hainan Island. Reported in other parts of the country; the level of soil calcium content, can indirectly reflect the nutritional status of human calcium.