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中文摘要：
从在中央 Gonghe 盆的根加海·莱克的一个 7.82-m 沉积核心的顺序的样品，与 14C 标明日期的 12 加速器团 spectrometry ( AMS )控制了，为全部的器官的碳( TOC )和全部的氮( TN )内容被分析了，体积有机物( 13Corg )的碳同位素，并且焦化内容。植物 macrofossils 和茎 encrustations，主要源于 P 的种类。pectinatus， M。spicatum 和 Chara spp，被识别，并且他们统治了湖的水的植物社区。Chara spp 的植物 macrofossils 的引申。并且脉管的种类随着时间的过去反映湖的变化生产率。在如此的一个浅湖，碳酸盐内容是间接地高度在生产率与水的 macrophytes 并且这样的光合作用有关显示变化，与 palaeoproductivity 的量的估计一致。把结果基于这些， palaeoproductivity 历史在过去的 ca 上被重建。16 ka。湖在 15.3 cal ka BP 被形成或再装，在核心底由风神的沙存款显示了。palaeoproductivity 的显著增加从 15.3 ～ 11.6 cal ka BP 发生了。在 11.6 和 9.2 cal ka BP 之间，一严厉地增加了水级，由提高的亚洲夏天季风可能调制了，可能为 macrophyte 植被超过了最佳水深度，在水的 macrophytes 和低 palaeoproductivity 的范围引起显著衰落。palaeoproductivity 看起来在从 9.2 ～ 7.4 cal ka BP 的时期的早阶段高，然后在约 8.6 cal ka BP 减少了。palaeoproductivity 支撑了在 7.4 和 2.1 cal ka BP 之间的全面高水平，并且自从 2.1 cal ka BP，逐渐地减少了。我们的结果建议根加海·莱克 palaeoproductivity 的可变性可以与亚洲夏天季风的力量控制的湖水平的变化被联系，可能在亚洲夏天季风显示变化。
英文摘要：
Sequential samples of a 7.82-m sediment core from Genggahai Lake in the central Gonghe Basin,controlled with 12 accelerator mass spectrometry （AMS） 14 C dates,have been analysed for total organic carbon （TOC） and total nitrogen （TN） contents,carbon isotope of bulk organic matter （δ 13 C org）,and carbonate content.Plant macrofossils and stem encrustations,derived mainly from the species of P.pectinatus,M.spicatum and Chara spp.,were identified,and they dominated the aquatic plant community of the lake.Alternations of plant macrofossils of Chara spp.and the vascular species reflect the changing productivity of the lake over time.In such a shallow lake,the carbonate content is highly related to photosynthesis of aquatic macrophytes and thus indirectly indicates variations in productivity,consistent with a quantitative estimate of palaeoproductivity.Based on these results,the palaeoproductivity history was reconstructed over the past ca.16 ka.The lake was formed or recharged at 15.3 cal ka BP,as indicated by aeolian sand deposits at the core base.A marked increase in palaeoproductivity occurred from 15.3 to 11.6 cal ka BP.Between 11.6 and 9.2 cal ka BP,a sharply increased water-level,modulated probably by the enhanced Asian summer monsoon,might have exceeded the optimum water depth for macrophyte vegetation,causing a marked decline in coverage of aquatic macrophytes and low palaeoproductivity.The palaeoproductivity appeared to be high in the early stage of the period from 9.2 to 7.4 cal ka BP,and then decreased at approximately 8.6 cal ka BP.The palaeoproductivity sustained an overall high level between 7.4 and 2.1 cal ka BP,and decreased gradually since 2.1 cal ka BP.Our results suggest that the variability of Genggahai Lake palaeoproductivity may be associated with fluctuations of the lake level controlled by the strength of the Asian summer monsoon,probably indicating changes in the Asian summer monsoon.
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