艾比湖地区中全新世以来孢粉组合与古气候定量重建.pdfVIP

Abstract The inland arid, semi-arid closed lakes the response is very sensitive to climate change, so it is the ideal paleoenvironmental research sites, and palynological assemblages of lake sediments can directly reflect the landscape and vegetation types of plant communities in the Lake District, and thus become an important paleoclimate research. Ebinur Lake is located in the Junggar Basin of the southwest, is the center of this catchment area. 214 surface pollen samples taken from the Ebinur Lake region, combined with a near 18 meteorological stations in the 30 years 1970-2000 meteorological data and the the Ebinur Lake easterly direction 1.7 meters deep profiles use WAPLS (weighted average method of least squares) quantitative Ebinur Lake region since the mid-Holocene paleoclimate reconstruction evolution: between 4730-4014a BP Ebinur Lake region showed a cold wet climate characteristics, the average temperature of -2.8 ° C, average precipitation 270.5mm; in between 4014-2780a BP less precipitation, average precipitation is 252.5mm, and low temperature, average temperature of -3.5 ° C the the Ebinur Lake region as a whole desert vegetation landscape shows a cold and dry climate conditions; in 2780 -2382a BP between temperature rise, an average of -2.9 ° C temperature rise compared to the previous vicinity; precipitation between 299-400mm, average 351mm, river water within the basin plenty Ebinur Lake in the high lake period; in 2382 - 2134a BP, the average temperature of -1.8 ‵, the average annual rainfall is 216mm, elevated temperatures and decreased precipitation Ebinur Lake area of narrow period, the Lake weekly desert vegetation. Some evidence indicates that the entire northern region of