【作者】 高兴东；

【导师】 何江；

【作者基本信息】 内蒙古大学 ， 环境科学， 2006， 硕士

【摘要】 本文以中国北方半干旱区湖泊岱海为研究对象，开展了湖泊上覆水、沉积物中碳、氮、磷等营养盐的环境地球化学行为研究，探讨了沉积物中营养盐的含量、分布特征及其赋存形态，营养盐在沉积物中的累积和迁移转化过程，以及对湖泊富营养化进程的潜在影响，揭示了湖泊内外源污染负荷特点及富营养化发生机理，为湖泊生态系统健康受损机制研究提供了合理的科学依据，对岱海流域经济社会可持续发展有一定的应用价值和指导意义。通过研究得出以下结论： 1．岱海湖泊上覆水中全氮(TN)、全磷(TP)浓度分别为2.28mg／l和0.20mg／l，TN营养指数为68.38，TP营养指数为69.56，除个别区域外，绝大部分湖区营养指数均较高，岱海已处于富营养化状态，上覆水中TN／TP比值为12.6，表明岱海湖泊中磷是限制水体初级生产力及阻碍湖泊富营养化进程的营养元素。 2．岱海表层沉积物中全氮含量在0.76g／kg～2.84g／kg间变化，有机氮含量在706.86mg／kg～2691.95mg／kg间变化，水平分布上全氮与有机氮总体具有从北到南、由深水区向浅水区含量递减的变化趋势，硝态氮含量在1.68mg／kg～7.36mg／kg间变化，湖区东北出现高值区，西南、南部及东南出现低值区，铵态氮含量在44.25mg／kg～166.00mg／kg间变化，呈现湖区西北部和东北部高而西南部低的分布特征；沉积物柱芯中全氮、硝态氮和有机氮总体呈现随深度增加含量递减的趋势，铵态氮呈现随深度增加而含量增加的趋势。更多还原

【Abstract】 The research on environmental geochemical behavior of the nutrient of carbon, nitrogen and phosphor in overlying water and sediments of Daihai Lake was carried out. The content, distribution characteristics and existing form of nutrients was analyzed. Accumulation and conversion process of nutrients in sediments, and the potential impact of nutrients to the eutrophication course also was studied. The characteristics of both endogenous and exogenous load and the mechanism of eutrophication was posted for offering reasonable scientific accordance to the damage mechanism of ecosystem health, it has certain applied cost and guiding significance to the sustainable development of region economy. We reached the conclusion as follows:1. The concentration of TN and TP in overlying water of Daihai Lake are separately 2.28mg·1^-1 and 0.20 mg·1^-1, the nutritive index of TN is 68.38, and the nutritive index of TP is 69.56. Except several position, nutritive index at most position are higher. The ratio TN/TP in overlying water is 12.6. So phosphor restricts primary productivity of the water body and blocks the eutrophication course of the更多还原