北京主要农业土壤和粮食作物中若干元素的背景值研究

本工作对北京主要农业土壤(褐土和潮土)和粮食作物(小麦、玉米和水稻)中的Hg、Cd、As、Pb、Cr、Ni、Cu、Zn、F九种元素的背景值进行了研究.对北京的环境地理、采样、分析测定、土壤和作物测定的分布类型和区域间的差异性进行了探讨.所有测定值都用DJS-130型电子计算机进行统计处理。土壤和作物的背景值为正态分布时,用算术平均值及其标准差表示;为对数正态分布时,用几何平均值及其标准差表示.

BACKGROUND VALUES OF SOME ELEMENTS OF MAIN AGRICULTURAL SOIL TYPES AND CROPS IN BEIJING

Contents of Hg, Cd, As, Pb, Cr, Ni, Cu, Zn and F of main agricultural soils(drab and chao soil)and cereal crops(wheat, maize, and rice) in Beijing area were determined. The geographic environment, sampling, analytical method, distribution state of all data for different soils and crops, and difference between districts were discussed. All the data have been treated statistically with a DJS-130 electronic cumputer. The background values of the elements in soils and crops are expressed in arithmetic mean and its standard deviation with normal distribution state, or geometric mean and its standard deviation with logarithmic normal state.