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。
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.
再以长城沿线为界，南部为森林草原区，北部为干草原、沙化草原区。
Another line is nearly in Great Wall zone, where the south is forest grass zone, the north is dry and desert prairie.
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