中文摘要：

获取南四湖不同湖区原位柱状沉积物，分析其不同形态氮磷及有机质的空间分布特征，并探讨其相关性。结果表明，南四湖沉积物含有丰富的氮且空间差异性显著，总体呈北高南低的趋势，南阳湖区（NSH1）TN含量最高，表层30em沉积物平均含量达2471mgkg^-1，这与南四湖北部距济宁市区较近，受污染较重有关。沉积物氨氮平均含量（表层30cm）的变化范围在33．12-61．09mgkg^-1，其中以微山湖区（NSH4）含量最高，平均值达61．09mgk^-1，这与近年来微山湖区水产养殖业的快速发展有关。南四湖沉积物TP含量由大到小的顺序依次是NSH1〉NSH2〉NSH4〉NSH3，其中，IP含量约占TP含量的71％-90％，沉积物各磷形态在垂向分布上比较复杂，规律性不明显。南四湖4个湖区沉积物有机质（LOI）平均含量为4．66％～9．0％，同TN和TP显著相关，说明南四湖沉积物氮、磷在沉积行为上具有一定相似性，且沉积物中氮磷可能主要来自湖泊沉积物有机质的矿化，TP与IP的相关性显著，与OP的相关性不显著，表明TP的增加主要来源于无机磷中的Fe／Al—P和Ca—P。

英文摘要：

Intact columnar sediments were collected characteristics and correlations of nitrogen, phosphorus, from different zones of Nansi Lake, and the distribution organic matter in the sediments were analyzed and discussed. Results showed that total nitrogen （TN） in the sediments was abundant and varied significantly between different sampling points, which presenting a decreasing trend from north to south. TN contents in the sediments of Nanyang Lake （NSH1） was highest and averaged 2471 mg kg^-1 in 0 - 30 cm surface sediment. This area was polluted seriously bacause the Nanyang Lake located near Jining City. The average ammonia nitrogen （NH4^＋-N） contents in 0 - 30 cm surface sediment of Nansi Lake ranged from 24.56 - 61.09 mg kg^-1, and were highest in Weishan lake （NSH4）. This might be attributed to the rapid development of aquaculture industry recently. The descending order of sediment total phosphorus （TP） contents in the sediments of four different zones was NSHI〉NSH2〉NSH4〉NSH3, and the inorganic phosphorus contents （IP） t were highest, and averagely accounted for 71% - 90% of TP. The vertical distributions of different phosphorus fractions varied among samples, which did not have similar distribution patterns. The average sediment organic matter （LOI） ranged from 4.66% - 9.00%, and the LOI was significant correlated with TN and TP, nitrogen and phosphorus in sediments of Nansi Lake had certain similarity in sedimentary behaviors, and the main source of sediment nitrogen and phosphorus was the mineralization decomposition of organic matter. Sediment TP had significant correlation with IP, and no distinct correlation with organic phosphorus （OP）, which showed that the increase of sediment TP was mainly owing to the Fe/A1-P and Ca-P.