南四湖现代沉积物中营养元素分布特征  

Characteristics of nutrients distribution from recent sediment in Lake Nansihu

作　　者：杨丽原[1] 沈吉[2] 刘恩峰[2] 季峻峰[1] 

机构地区：[1]南京大学地球科学系 [2]中国科学院南京地理与湖泊研究所,南京210008

出　　处：《湖泊科学》2007年第4期390-396,共7页Journal of Lake Sciences

基　　金：中国科学院知识创新工程重要方向项目(KZCX3-SW-348);国家自然科学基金(40672076);济南大学博士基金(B0426)共同资助.

摘　　要：对南四湖不同湖区20个表层沉积物和独山湖湖区沉积岩芯中营养元素进行了分析．结果表明表层沉积物中南阳湖总磷最高,独山湖次之;独山湖总有机碳和总氮含量最高,南阳湖次之;而昭阳湖总有机碳、总氮和总磷含量较低．沉积岩芯中^(137)Cs数据表明南四湖独山湖区柱状沉积物上部(0-18 cm)沉积速率为3．5mm/a;总有机碳、总氮和总磷含量主要集中在沉积岩芯0-8 cm内,并呈现一致的垂向分布规律,具有明显的三阶段分布特征,反映了流域社会经济的发展导致营养元素的释放量增加,造成了湖泊现代沉积物中营养元素的积累．碳氮比值处于7．6-11．4之间,有机质的选择性分解不明显,指示沉积物中有机质主要来自无纤维柬的陆源植物．监测数据表明济宁市的城市生活污水、工农业废水排放进入南阳湖是南四湖有机质和TP富集的主要来源．Nutrients concentrations in surface and core sediments from Lake Nansihu were investigated. The results showed that sediments from Lake Nanyanghu had significantly higher TP concentrations than any other area of Lake Nansihu. Lake Dushanhu had from the highest TOC and TN content. Lake Zhaoyanghu had low TOC, TN and TP concentrations. The method of^137 Cs dating was used to derive accumulation rates of 3.5 mm/a for Dushanhu Lake. The historical profiles of Dushanhu Lake showed that TOC ,TN and TP mainly enriched in 0 - 8 cm, and presented simultaneously changeable trends. The development of the Basin society and economy had resulted in nutrients re- lease increasing, which made nutrients accumulation in recent sediment. C/N ratios varied slightly. They are 7.6 and 11.4 for the recent core. These characteristics suggested that organic matters in the sediments mainly originated from continental plants without cellulose and reserved variations in ecosystems resulted from continents. The monitored data indicated that the discharge of domestic, industry and agriculture from the lake basin directly into Nanyanghu Lake was the mainly source that made the enrichment of TOC ,TN and TP in Lake Nansihu.

关 键 词：南四湖 沉积物 营养元素 

分 类 号：X524[环境科学与工程—环境工程]