区域化探扫面资料在农业及环境中的应用

本文采用了分析对比的方法将河北省1:20万青龙幅和山海关幅的区域地球化学资料应用于农业及环境问题的研究。通过对研究区岩石、土壤、水系沉积物中元素分布特征的比较,表明该区水系沉积物中元素含量能够在区域上反映土壤中元素含量的变化趋势。将历年来农作物产量及疾病死亡率分布与地球化学元素分布进行对比,发现有一定的关系。并发现该区大面积缺锌、钼、铜元素,影响了某些农作物产量的增长。还发现了环境中钼元素的分布对食道癌的影响,铬元素的分布对高血压、糖尿病的影响。文中还提出了潘家口水库上游的铬、砷、铅异常的潜在威胁。根据上述结果,初步确定了各元素在该区的正常、过量及缺乏限,并尝试性地编制了标有“缺乏区”“潜在缺乏区”“潜在过剩区”的锌、铜、钴、钼、铬元素的环境地球化学图。

THE APPUCATION OF 1:200,000 REGIONAL GEOCHEMICAL RECONNAISSANCE DATA TO AGRICULTURAL AND ENVIRONMENTAL FIEL DS

This paper deals with the application of 1:200,000 regional geochemicar reconnaissance data to agriculture and environment. Specifically, the study tries regionally to solve the problems of crop yields and endemic deseases.Our research work was carried out in Qinglong and (Sanhaignan sheets of Hebei Province. Acomparison of the distribution Pattern between elements in rocks, soils and stream sediments can regionally represent or reflect the fluctuation of elements in soils of the stream catchment. Investigation into the relation of crop yield and death rate in recent years to geochemical distribution of elements reveals that:(1) deficiency of Zn, Mo and Co in large areas of the sheets has to some extent exerted adverse effects on the increase in output of certain crops; (2) the low concentration of Mo in the environment coincides with the distribution of esophagus cancer, and the low concentration of Cr with hypertension and diabetes. Last but not least, it is pointed out that the potential threat of Cd, As and Pb anomalies in the upper reaches of Panjiakou reservoir which supplies drinking water for Tianjin City should be taken into account.According to the comparison and investigation, the normal range as well as the deficiency and excess limits of the elements in these sheets are preliminarily determined, and the environmental geochemical maps of Zn, Cu, Co, Mo and Cr are tentatively compiled.