通过对长武下孟村黄土剖面的野外考察和磁化率、粒度、吸湿水含量分析 ,探讨了该地区晚冰期以来气候变化规律 .研究结果表明 ,该剖面较好地记录了新仙女木期 (YD)和博令 阿勒罗德事件 (BL +AL)短尺度较小幅度气候变化事件 .对应全新世气候最适宜期 ( 850 0— 31 0 0a .BP) ,该地为黑垆土成壤期 .从 31 0 0a .BP开始 ,季风气候格局快速转变 ,气候干旱化 ,土壤和土地资源退化 .所以 31 0 0年来该地区形成了弱成壤的土壤层和黄土层 Through the field investigation and the analysis of magnetic susceptibility, grain size and hygroscopic water content of the loess section in Xiamengcun, Changwu, the climate change pattern of the area since the late glacial period was discussed.The results show that the section records well the wood temperature YD) and Bering Aleroder event (BL + AL), corresponding to the most suitable period of the Holocene climate (850 ~ 3100a BP) Since 3100a BP, rapid changes in the monsoon climate, climate aridification, and degradation of soil and land resources have led to the formation of weakly-formed soil and loess layers in the region in 3100