【摘要】 从化学元素生物学和地球化学分类的角度，分析了大量营养元素、必需微量元素、可能必需元素、非必需元素和有毒元素在岳桦（Ｂｅｔｕｌａｅｒｍａｎｉ）体内的含量特征和变化规律。结果表明：大量营养元素在岳桦体内的含量高于其它几类元素的含量；在新陈代谢旺盛的叶片中各类型元素含量均高于其它器官；化学性质和地球化学性质相近、生物学功能相似的大量营养元素和必需微量元素在岳桦不同器官中的含量变化具有相似的规律；其它三种类型的元素变化无规律可循，表明植物所必需的元素在植物体内的变化是按一定规律进行的；在不受人为因素干扰的情况下，它们之间处于相对平衡状态。更多还原

【Abstract】 Based on catalogue of biology and geochemistry of chemical elements, content character and variation law of the large nutrient elements, the needful trace elements, the uncertain needful elements, the non needful elements and the toxic elements in Betula ermanii are analyzed. The result shows that the content of the large nutrient elements in Betula ermanii is higher than that of others; all kinds of elements content in foliage of vigorous metabolism is higher than that of other parts; the content variation of large nutrient elements and the needful trace elements with similar chemical property, geochemical property and biological function in different parts of Betula ermanii shows the similar law; but the other three kinds of elements variation is not, it is indicated that the variation of the needful elements in the plants follows a certain law, they are in relative equilibrium under undisturbed condition.更多还原