摘要
松嫩沙地是由下伏冲积砂经风力吹扬、堆积而形成的,风成砂既是具风成特点,又保留冲积特征。自全新世形成以来,沙地曾经历了4次固定时期和4次扩张时期。松嫩平原西部在9000年以前气候较为干旱,自然环境为荒漠、半荒漠;9000年—7000年,气候为半干旱,自然环境演变为蒿类草原或稀树蒿类草原;距今7000年以来经历了3次干旱期、2次半干旱期和1次半湿润期;距今1000年以来,气候又呈变干趋势。
The paper studied the formation factors of Sandy Land, the characteristics of the grains, composition of the heavy minerals and the surface microstructure of the quartz; considered that Songnen Sandy Land came from the alluvial sand of Songnen Plain by the wind erosion,transportation and deposition. There are two or three layers of paleosol in the Sandy Land. The results of thermoluminescene,14C and archeology analysis reflect that the Sandy Land experienced four fixed periods and four shifting periods after it formed in the early Holoncene. Also the paleoenvironments in the west Songnen Plain in Holoncene were reconstructed according to the changes of Sandy Land and pollen characteristics of paleosol.
出处
《中国沙漠》
CSCD
北大核心
1991年第3期36-43,共8页
Journal of Desert Research
