In many semiarid areas there is also a lower timberline where the forest passes into steppe or desert at its lower edge, usually because of a lack of moisture.
在许多半干旱的地区中，同样存在树带界限的下限区域；在这片区域之内，由于缺乏水分，森林下沿区域的植被通常会逐渐变成干草原或沙漠。
The changes are manifested in belts from forest, bush, meadow and steppe to desert.
森林、灌丛、草甸、草原到荒漠呈带状更迭。
It is situated in the center of Asia and it has some climatic zones: from forest-tundra to steppe.
他位于亚洲的中部，它也有很多种的气候区域：西伯利亚大草原的森林苔原。
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