中世纪暖期浑善达克沙地空间格局与景观特征

中世纪暖期是冰后期的又一次回暖期,研究表明当时我国东部沙地均出现不同程度的流沙固定现象。利用已有的研究成果,对浑善达克沙地若干古土壤和河湖相沉积进行分析,结果表明,中世纪暖期浑善达克沙地气候温暖湿润,沙地中普遍发育古土壤和河湖相沉积,流沙固定,特别是沙地东部、中部和南部流沙被大面积固定,沙地面积缩小;孢粉分析结果表明,沙地内植被发育较好,盖度增加,形成干草原-疏林草原景观。研究结果将为浑善达克沙地未来气候环境演变趋势提供背景资料。

Spatial Pattern and Landscape Characteristics in Otindag Sandy Land During the Medieval Warm Period

The Medieval Warm Period(MWP)was another warm period after postglacial epoch.The research results indicated that driftingsands were fixed in sandy land during theMWPin eastern China.In this article,sometypical Holocene sections,found in Otindag Sandy Land,were collected and demonstratedthat climate was warm and humid during the MWP,paleosol and lacustrinesedimentdevelopedand driftingsands were fixed,especially in eastern,southern and the middle of sandy land,and the area of sandy land became smaller.Pollens were analyzed to certify that the vegetation cover increased and the landscapes of the sandy land were dry grassland or wood grassland.This result will be the basic data for the research of environment changes in Otindag Sandy Land in the future.