关键词: 古气候环境, 全新世, 宁夏水洞沟

Abstract: With a series of geological investigation, intensive samples chosen and a large amount of sporepollens analysis to some sections chosen from the ruins of Shuidonggou in Ningxia, the authors can see clearly that every sample had gained more than 100 grains of sporepollens and one of these samples even gained more than 3 654 grains of sporepollens at that time. By a careful analysis to the amount of the sporepollens, the evolution of the vegetations in the region was explored specifically. Furthermore, it proves the characteristics of the changeable climatic environment during the period of Holocene. Finally, it draws the conclusion about the vegetations grown at that time in this region and the climatic environments it represented during the three stages of Early Holocene, Middle Holocene and Late Holocene. The authors have worked out quite a few pollens and spores from in nineteen samples of the loess section, and plotted a concentration sporepollens diagrams of the loess strata. The evolution of vegetation during the Holocene and the corresponding climate in time and space in the region has been brought to light by an analysis of the variation of sporepollens assemblages in this section. The results indicate that the climate in the Early Holocene was colder and drier,Middle Holocene was warmer and wet and Late Holocene was dry and cold.

Key words: paleoclimatic environment, Holocene, Shuidonggou, Ningxia