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通过对新疆博斯腾湖湖芯沉积物中有机质饱和烃、有机质碳同位素组成(δ~(13)C_(crg))以及与前人得到的环境代用指标结果综合分析,重建了博斯腾湖从早全新世晚期以来古生态环境和湖泊水文的变化历史。结果表明,博斯腾湖大约在8130cal.a B.P.之前气候冷湿,湖泊不发育;约在8130~6400cal.a B.P.为暖湿的全新世适宜期,博斯腾湖流域降水和开都河径流量增加,湖泊水位上升外溢,水生植物及陆生植物发育;6400~5500cal.a B.P.左右冷湿,有效湿度较高,湖泊仍处于较高水位;5500~3000cal.a B.P.左右气候波动明显,为温干时期,而大约在4500—3900cal.a B.P.期间降温,为冷干环境;3000cal.a B.P.以来气温降低,2300~1250cal.a B.P.左右气温有所回升,大约自1250cal.a B.P.以来博斯腾湖地区自然环境逐渐干旱恶化,陆生植物发育较差,而湖泊中沉水植物发育较好。
Through the comprehensive analysis of the δ13Crg (δ13Crg) of organic matter, the carbon isotope composition (δ ~ (13) C_ (crg)) of the sediments from the Bosten Lake in Xinjiang and the environmental proxy index obtained from the predecessors, the Bosten Lake has been reconstructed since the late Early Holocene Paleoecological environment and lake hydrology history. The results show that the climate of Bosten Lake is cold and wet before 8130cal.a BP, and the lakes are not developed. About 8130 ~ 6400cal.a BP is warm and wet during the Holocene suitable period. The precipitation in the Bosten Lake and the Kaidun River runoff increase, Spillover, aquatic plants and terrestrial plants development; about 6400 ~ 5500cal.a BP cold and wet, high effective humidity, the lake is still at a high water level; 5500 ~ 3000cal.a BP about the obvious climate fluctuations for the warm dry period, and about The temperature dropped from 4500 to 3900cal.a BP, which is a cold and dry environment; the temperature dropped since 3000cal.a BP, and the temperature rose from 2300 to 1250cal.a BP, and the natural environment in the Bosten Lake region gradually deteriorated since about 1250cal.a BP, Terrestrial plants are poorly developed, while submerged plants in lakes develop better.