具有年、季旋回界面因而能够自我记年,同时能对气候或环境变化信息按年记录的自然材料称为“自然时钟”.洞穴石笋是继树轮、珊瑚、纹泥和冰芯之后较晚发现的一种自然时钟.石笋微生长层的韵律变化反映了短尺度高频率的气候振动.石笋发光强度变化是古环境变化的重要记录.从滴水中 Natural materials with annual and quarterly cycles that enable self-remembered year-to-year records of climatic or environmental changes are called “natural clocks.” Cave stalagmites are later than tree rings, coral, mud and ice cores Found a natural clock.Microstructural growth of stalagmite micro-layer reflects the short-range high-frequency climate fluctuations.Study on the luminous intensity of stalagmite is an important record of paleoenvironmental changes.From dripping