林线是高山垂直自然带谱中一条重要的生态界线,通常是指山

    林线是高山垂直自然带谱中一条重要的生态界线,通常是指山地林木生长的高程上界。图1示意我国局部区域高山林线分布。读图回答12问题。

1.关于F区域林线分布特点的解释,最合理的是

    A.地势高,太阳辐射强  

    B.南部海洋气流北上影响

    C.山地河谷,土壤肥沃  

    D.西部暖湿气流的影响

2.影响区域东部多条林线走向的因素是

    A.河流    B.土壤   

    C.地形    D.纬度

答案

AC

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