中文摘要：

通过对东大海柱状沉积物岩芯有机质（OM）、总氮（TN）、总磷（TP）、C／N指标综合分析，研究了营养盐变化垂向演化特征。根据有机指数评价法、有机氮评价法和沉积物总磷的评价标准评价了营养盐状况，并且结合粒度探寻其来源。结果表明：岩芯深部（39～28cm）营养元素处于自然沉积状态；岩芯中下部（28～16cm）OM与TN来源相同，营养指标的变化主要是受气候等自然因素的影响，受人类活动的影响较小；岩芯中上部（16～7cm）OM和TN含量的减小在很大程度受到粗颗粒物质的影响，证实了降水量下降对该时期沉积物各项指标含量的影响；岩芯上部（7～1cm）有机质数由尚清洁类型向有机污染类型转变，有机氮属于有机氮无染类型，总磷为重污染。C／N说明有机质以内源碎屑为主，各营养指标增加明显并处于较高的阶段，说明近年来湖泊富营养化现象明显加剧，因此水体富营养化的治理仍是大庆地区水环境整治工作的重点。

英文摘要：

OM, TN, TP, and C/N were comprehensively investigated from the D core sediments of the Dongdahai Lake, which represented vertical evolution characteristics of nutritive salt. Furthermore nutritive salt were also evaluated by organic index and organic nitrogen appraisal method and evaluation criterion of phosphorus in deposit sediment, and its sources were investigated with particle size. The results indicated that the concentrations of most elements were from natural sources at 39 - 28 cm. OM and TP shared the same origin at 28 - 16 cm, for the change of nutritive index was mostly impacted by the climate and other natural factors and less by human activities. Largely controlled by coarse particulate matters, OM and TP decreased at 16 -7 cm, which confirmed the influence of decreasing precipitation on the indicators of the sediment in that period. At the upper part core （7 - 1 cm） , the organic index transformed from clean to organic pollution type, organic nitrogen was pollution free, and total phosphorus was heavily polluted. Organic matter mainly was endogenous clastics by C/N and the nutrition indicators were at the higher stage, which indicated the lake eutrophication was aggravated in recent years and the control of water eutrophication in Daqing should he focused on.