阿拉善荒漠草地类微量元素含量特征的研究

Study on Characteristic of Trace Element Content in Desert Grassland of Alxa

对阿拉善所属的 4个草地类 6个亚类 75个牧草 2 5个土壤样本中的Fe、Mn、Zn、Cu、Co、Mo、Se等 7种微量元素的含量及分布类型进行研究 ,并对各草地类牧草中微量元素的含量进行评价。研究结果表明 ,土壤中微量元素除滩地戈壁亚类 ,山前倾斜地亚类、河泛地低地亚类Se含量及冷温潮湿类的Cu和Zn含量正常外 ,其它都低于我国和世界正常土壤平均含量。微量元素的缺乏与成土母质相关。阿拉善地区气候、土壤等生态条件复杂 ,但牧草中微量元素的含量有一定范围 。

Content and distribution type of Fe,Mn,Zn,Cu,Co,Mo,Se, in 6 subtypes among of 4 types of grassland in Alxa were studied with 75 herbage samples and 25 soil samples, and content of trace element were estimated in herbage of various subtypes of grassland. The result showed that there was normal content of Se in flat Gobi, foothill slope, low land and Cu,Zn in coldemperate-humid type, lower in the other subypes or types than the average content of normal soil in China and in World. Deficiency of trace elements was correlative to soilforming rock. The content of trace elements in herbage had a certain extension in despite of complex climate, soil and other ecological condition in Alxa, which was correlative to the ability of herbage to absorb and accumulate trace elements.