【摘要】 <正> 燕山南北长城地带包括西起太行山,东到渤海,北起内蒙古东南和辽西,南抵海河流域的广大地区,属华北地区的东北部。这里地貌的基本特征呈山区—平原—海湾的阶梯分布,西、北部为连绵不断的群山和山间盆地,向东为平原和海湾。山间盆地的全新世泥炭沉积中包含了丰更多还原

【Abstract】 In this study, to reconstruct the paleoclimatic history, pollen and oxygen isotope analyses are made on 160 samples of a peat core from Taishizhuang, Huailai County, Hebei Province. Combined with other information of climatic history and archaeology in this area, our research results suggest that there was a close linkage between cultural development and the mid—Holocene(6000—4300 BP)environmental changes. The main results and conclusions are as follows:The climate during 5678—5400 BP was unstable and in general colder and drier than present. From 5400—4800 BP, the climate was much warmer and more humid than before. The climate during 4800—4300 BP was persistently cold, with an exceptional colding event occurring in 4600—4300 BP. This event was recorded at several other localities. in Northern China and even the Northern Hemisphere, and played an important role in cultural development. In North China, the fall of Hongshan Culture and undevelopment of Xiaoheyan Culture may have been related to this colding event. After that, there was a return to warmer conditions between 4300 and 3300 BP.更多还原