阿拉善荒漠三个草地类牧草中化学元素特点的研究

A STUDY ON THE CHARACTERISTICS OF CHEMICAL ELEMENTS OF FORAGE SPECIES IN THREE RANGE TYPES IN ALXA DESERT

对阿拉善荒漠微温干旱、微温极干和暖温极干三个草地类９科４４种牧草中常量元素（Ｎ、Ｃａ、Ｐ）和微量元素（Ｆｅ、Ｍｎ、Ｚｎ、Ｃｕ、Ｃｏ、Ｍｏ、Ｓｅ）含量的变化特征、丰缺程度和生物吸收序列的研究结果表明，该区不同科牧草中各元素的含量变幅很大，但其吸收各元素多寡的趋势基本一致。

This paper dealt with the characteristics,rich-lack levels and biological absorption ordersof macronutrients(N,Ca,and p)and trace elements(Fe,Mn,Zn,Cu,Co,Mo and Se)of about 44forage species from 9 familics in three types of ranges(slight-hot drought,slight-hot extreme droughtand warm-hot extreme drought)in Alxa desert.The results showed that different forage species havethe great changes in element contents,but the tendency of absorbing elements was consistent.