题目内容

下图为我国某地区示意图,回答下列问题。
(1)比较乙、丙两区域植被类型的差异及产生差异的原因。
                                                                                                                                                               
                                                                                                                                                               
(2)分析甲地区发展农业的自然区位优势。
                                                                                                                                                               
(3)在秋末冬初或冬末春初,甲地区常产生的主要自然灾害有哪些?
                                                                                                                                                               
(4)甲地区有密集的灌溉渠道和排水渠道,分析该地区排灌结合的优势条件及对土壤的有利影响。
                                                                                                                                                               
                                                                                                                                                               

(1)乙:温带草原;丙:温带荒漠(或由温带草原向温 带荒漠过渡)。原因:(与乙比较)丙距海
        洋较远,水汽少(或降水由沿海向 内陆递减或丙为干旱区域,乙为半干旱区域);地形 阻挡使
        水汽难以到达。
(2)地形平坦,土壤肥沃;光热充足,昼夜温差大;灌溉水源充足。
(3)凌汛;寒潮、沙尘暴。(答出任意一点即可)
(4)位于黄河西侧,河流提供灌溉水源;依据地形地势条件河流自流灌溉和排水(既利于灌又利于
        排);排灌结合既满足了农作物对水分的要求,又有利于保持土壤肥力,防止土壤盐碱化。

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