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中文摘要：
选择位于共和盆地中部的更尕海钻孔岩芯为研究对象，利用12个AMS^14C年龄建立了湖泊沉积的时间序列．通过对沉积物碳酸盐含量、总有机碳（TOC）含量、总氮（TN）含量、C／N、有机质碳同位素（δ^13Corg）以及遗存植物大化石等的系统分析，结合定量估算，重建了16ka来湖泊生产力的变化历史．更尕海植物大化石及碳酸盐结壳以轮藻（Chara spp．）和沉水维管束植物为主，且交替出现，反映了湖泊古生产力的变化．碳酸盐的沉淀与水生植物的光合作用密切相关，间接指示了湖泊古生产力的变化．此外，定量估算的古生产力与碳酸盐含量具有较好的一致性．重建结果显示，16．7～15-3calkaBP，湖泊尚未形成，为风沙环境；15．3～11．6calkaBP，湖泊生产力显著提高；11．6～9．2calkaBP，受亚洲夏季风增强的影响，急剧升高的湖泊水位抑制了沉水植物的生长，湖泊生产力降低；9．2～7．4calkaBP时段，早期湖泊古生产力较高，8．6calkaBP之后有所降低：7．4～2．1calkaBP，生产力维持在较高的水平；2．1calkaBP以来，湖泊生产力呈逐渐降低趋势．更尕海湖泊古生产力变化与亚洲夏季风强度影响的湖泊水位变化有关，一定程度上反映了亚洲夏季风的盛衰．
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