里下河区浅水湖泊表层沉积物营养盐溯源分析

Traceability Analysis of Nutrients in Surface Sediments of Shallow Lakes in Lixiahe Region

以里下河区的大纵湖、得胜湖、蜈蚣湖、九龙口为例,分析了表层沉积物总有机碳(TOC)、总氮(TN)、总磷(TP)的垂向分布特征,探讨了引起其含量变化的影响因子以及三种元素之间的相关性特征,通过C/N和N/P的比值追溯C、N、P的来源。结果表明,四个湖泊中表层沉积物中的TOC含量随深度的增加而降低;刚经过疏浚的湖泊表层底泥中的总有机碳、总氮、总磷含量明显小于其他湖泊;不同湖泊营养盐的相关性存在较大差异;除DS采样点外,研究区域C/N值多介于2~8之间,有机质来源以水生植物为主。

Taking Jiulong Kou Lake,Dazong Lake,Wugong Lake and Desheng Lake in Lixiahe area as an example,the vertical distribution of total organic carbon(TOC),total nitrogen(TN)and total phosphorus(TP)in the surface sediments were analyzed.And the influencing factors of the content change and the correlation between the three elements were discussed.Then the sources of C,N and P were traced by the ratios of C/N and N/P.The results indicate that the contents of TOC in the surface sediments of four lakes decreased with increasing depth;the amount of TOC,TN and TP in the surface sediments of the recently dredged lakes is significantly smaller than other lakes;the correlation between nutrients will have a greater difference in different lakes;sampling point except DS,in study area,the C/N values mainly are in the range of 2 and 8;the main source of organic matter is aquatic plants.