【摘要】 本文研究放牧草原中地衣和地耳的化学元素组成特点、水溶性元素形态所占的比例以及地衣的元素含量与放牧率的关系。结果表明，地衣和地耳的C、N、Ca含量较高（＞1％）；P、Mg、K、Fe含量中等（0．1～1％），Na、Mn、Cu、Zn、B含量较低（＜1％）。地耳中水溶性N占全N的21％。放牧区C含量下降，N含量提高，C／N比在中牧和重牧区较低。Ca、Mg、K、Fe、Mn、Cu与放牧率的关系表现为不放牧（对照）区较低，放牧处理较高。P、Na、Zn、B含量则表现为不放牧（对照）、轻牧和重牧区较高。更多还原

【Abstract】 Element contents and proportions of soluble elements in Xanthoparmelia camtschadalis (Ach.) Hale and Nostoc commune,and relationships of element contents in lichen with stocking rates were investigated in a pasture of Ieymus Chinensis steppe. The results indicated that:both in lichen and Notoc commune, C, N and Ca concentrations are high level, >1%; P,Mg K, Fe concentrations are middle level,between l to 0.1%; Na, Mn, Cu, Zn, and B concentrations are low level, <0.1%. The soluble N in Nostoc commune account for 21 % of total N. With stocking rates increasing,C concentration decreased,meanwhile N increased. C/N ratio is smaller in moderate and heavy grazing treatments. The contents of Ca、Mg、K、Fe、Mn、Cu inlichen are lower in control, and higher in grazing treatments. P, Na, Zn and B contents are higher in treatments of control,hight and extremely grazing intensity.更多还原