造成非洲荒漠化的主要人为原因有 ( ) 1人口增长——荒漠化面积与人口密度呈正相...

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造成非洲荒漠化的主要人为原因有 ( ) 1人口增长——荒漠化面积与人口密度呈正相关 2过度砍伐——大约 600 万公顷的森林遭到砍伐 3过度放牧——大约 2.4 亿公顷的草场遭到破坏 4过度开垦——耕地面积扩大是荒漠化的首要因素

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