论文部分内容阅读
本文在浑善达克沙地选取34个代表性沙丘-砂黄土剖面,利用光释光测年技术确定地层年龄,在野外考察、风沙动力学分析以及气候替代性指标测试的基础上,结合前人的研究,确定了浑善达克沙地在末次盛冰期和全新世大暖期的范围:在末次盛冰期时,流沙南界到达镶黄旗-正镶白旗-正蓝旗-多伦一线,较现代沙地南界偏南约40km,沙地面积扩张约1.39×10~4km~2,扩张了37%;在9~5ka时段的全新世大暖期,沙地普遍发育灰黑色砂质古土壤,植被覆盖良好,沙丘固定,流沙南界向北退缩约200km。末次盛冰期和全新世大暖期浑善达克沙地空间格局的变迁受控于东亚季风强度和有效湿度共同影响。
In this paper, 34 representative dune and sand loess sections were selected in Hunshandake Sandy Land, and the age of the strata was determined by optical dating technique. Based on the field investigation, the dynamic analysis of wind-blown sand and the index of alternative climate indicators, Human studies have determined the range of the Hunshandake Sandy during the last glacial maximum and the Holocene: during the last glacial expanse, the southern boundary of the sand bank reached the Yellow-flag - the Zhengling white flag - Zhenglan Banner - the first line of Duolun, Which is about 40 km south of the south boundary of the modern sandy land. The sand area expands by about 1.39 × 10 ~ 4km ~ 2 and expands by 37%. During the Holocene warm-up period of 9 ~ 5 ka, the gray-black sandy ancient sandstone Soil, vegetation cover well, the sand dune fixed, south of the quicksand to shrink back about 200km. The changes of the spatial pattern during the last glaciation and during the Holocene Hunshandake Sandy Land were controlled by the combination of the East Asian monsoon intensity and the effective humidity.