Mountains to the north, northwest and west shield the city and northern China's agricultural heartland from the encroaching desert steppes.

北面、西北面和西面的群山将城市和华北农业中心地带环绕，阻止了沙漠草原对这些地方的侵蚀。

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The differences between typical steppe and desert steppe are obvious. Chenopodiaceae pollen percentages are usually less than 25% in typical steppes and more than 25% in desert steppes.

典型草原与荒漠草原花粉组合存在着明显的区别，典型草原区藜科花粉百分比一般低于25%，荒漠草原区一般高于25%。

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