里下河水系九龙口湖荡沉积物性状的垂向特征及环境指示意义  

Vertical characteristics and environmental significance of sediments in Jiulongkou Wetland in Lixiahe River system

作　　者：陈立尧[1] 刘凌[1] 钱宝[1] 高慧琴[2] 

机构地区：[1]河海大学水文水资源学院,江苏南京210098 [2]中水珠江规划勘测设计有限公司,广东广州510610

出　　处：《水资源保护》2013年第5期1-6,共6页Water Resources Protection

基　　金：国家自然科学基金(51279060);江苏省研究生创新计划(CXZZ11-0436)

摘　　要：对里下河水系九龙口湖荡沉积物中的碳和氮及其粒径进行测定，研究碳、氮元素的垂向分布与积累状况，分析沉积物的总氮（TN）、有机氮（ON）、铵态氮（NH4＋-N）、总有机碳（TOC）以及粒径之间的关系。结果表明：九龙口沉积物的中值粒径变化于13．44-82．01μm，垂向变化可大致分为3段；九龙口沉积物中氮素主要为ON，无机氮以NH4＋-N为主，氮素质量的垂向分布特征与九龙口地区20世纪50年代以来人类活动的历史背景相一致；TOC质量比随深度的增加呈先增加后快速减小的趋势。沉积物的w（C）／w（N）介于5．67～26．08之间，指示出沉积物中有机质主要来自有纤维束的陆源植物。沉积物TOC和TN呈极显著相关，W（C）／w（N）对TOC质量比敏感，3个测点中南部湖区受人类活动影响较大。Based on measurement of the concentrations of carbon and nitrogen and their particle sizes in the core sediments from the Jiulongkou Wetland, the accumulation status and the depth-dependent change characteristics of carbon and nitrogen were studied, and the relationships between TN, ON, NH4＋-N, TOC, and the median particle were analyzed. The results show that the median particle of sediments ranged from 13.44μm to 82.01μm, and the vertical change of the median diameter can be roughly divided into three sections. The total nitrogen was mainly composed of organic nitrogen, and the ammonia nitrogen mainly consisted of inorganic nitrogen. The vertical distribution characteristics of nitrogen were consistent with human activities in the study area since the early 1950s. With the increase of the depth of sediments, the TOC concentration first increased, and then decreased rapidly. The ratio of carbon and nitrogen w （ C ）/w （ N ） ranged between 5. 67 and 26. 08, which indicated that the terrigenous vegetation with fiber bundles was the primary possible source of the organic matter in the sediments. In addition, in the sediments, TOC was significantly correlated with TN, w （C）/w （N） was sensitive to the TOC concentration, and the southern region of the lake was affected by human activities to a greater degree than the other two monitoring sites.

关 键 词：原位沉积柱 碳氮分布 中值粒径 湖泊 九龙口 里下河水系 

分 类 号：X83[环境科学与工程—环境工程]