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中文摘要：
第四纪冰期-间冰期气候变化在年际尺度上是通过季节变化或季节长度的调整来实现的,如何揭示冰期-间冰期期间季节长度的变化,是深入探索气候变化过程和机制的新课题.蜗牛生长季节的壳体同位素具有记录季节性气候特征的潜力.通过对黄土高原不同气候区18个地点现生蜗牛组合中喜冷干种Pupillaaeoli（杂色虹蛹螺）和喜暖湿种Punctumorphana（显口多点螺）蜗牛壳体碳酸盐碳、氧同位素分析,揭示出P.aeoli蜗牛壳体δ13C值相对于P.orphana壳体偏负1.3±1.0‰,δ18O值偏正3.3±1.1‰;而且从黄土高原东部山西娘子关到西部青海官亭,随着生长季节长度（日均温≥10℃）由202±6d缩短为162±7d,冷、暖2种蜗牛壳体的δ13C差值和δ18O差值都逐渐减小,其中δ13C差值从东部的2.8‰减小到西部的0.2±1.1‰,δ18O差值从4.7‰减小到2.9±1.3‰.且2种蜗牛壳体δ13C差值每相差1‰,蜗牛生长季节相差约15d左右;δ18O差值每相差1‰,蜗牛生长季节相差约19d左右.进一步对西峰剖面75ka以来蜗牛壳体同位素分析显示,全新世中期（8～3ka）,蜗牛壳体δ13C和δ18O的差值最大,分别为2.6±0.7‰和2.1±1.4‰;间冰段MIS3次之,为2.5±0.4‰和1.6±0.8‰;末次盛冰期最小,为0.2‰和0.4‰.推测全新世中期蜗牛生长季节长度约为200±10d,间冰段MIS3为190±6d左右,冰期时蜗牛生长季节长度约160±3d左右.
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