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北方为什么要把葡萄蔓埋在地里过冬？
北方要把葡萄蔓埋在地里过冬，主要是为了防止葡萄蔓冻伤、减少水分蒸发以及保护葡萄蔓免受病虫害侵袭，具体如下：
1、防止葡萄蔓冻伤：北方冬季气温较低，葡萄蔓容易受到冻害。将葡萄蔓埋在地里可以起到保温作用，防止葡萄蔓因低温而冻伤。
2、减少水分蒸发：冬季风大，空气干燥，葡萄蔓中的水分容易蒸发。将葡萄蔓埋在地里可以减少水分的蒸发，保持葡萄蔓的水分平衡，防止葡萄蔓因失水而干枯。
3、保护葡萄蔓免受病虫害侵袭：冬季是病虫害的高发期，将葡萄蔓埋在地里可以减少病虫害对葡萄蔓的侵袭。土壤可以阻挡部分病虫害的传播，保护葡萄蔓的安全过冬。
总结：北方要把葡萄蔓埋在地里过冬，主要是为了防止葡萄蔓冻伤、减少水分蒸发以及保护葡萄蔓免受病虫害侵袭。
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