冬灌是指冬季往田里灌水。图为我国某地的冬灌景观图，田间作物为

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冬灌是指冬季往田里灌水。图为我国某地的冬灌景观图，田间作物为小麦。每年入冬，在日平均气温为3℃左右时最适宜冬灌，具有明显的增产作用。下列关于冬灌作用的叙述，不正确的是（）

A．缓和地温的剧烈变化，防止冻害

B．保护表层土壤，减少风力侵蚀

C．改善土壤的水分条件，缓解干旱

D．提高地下水位，防止土壤盐碱化

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