黄河悬浮物及底泥的有机碳同位素研究  

Study on the organic carbon isotopes of the suspended solids and sediments in Tongguan section on Yellow River

作　　者：宁有丰[1,2] 王琦[1] 曹苗苗[1] 王修内[1] 

机构地区：[1]西安理工大学西北水资源与环境生态教育部重点实验室,西安710048 [2]中科院地理科学与资源研究所陆地水循环及地表过程重点实验室,北京100101

出　　处：《干旱区资源与环境》2014年第3期119-122,共4页Journal of Arid Land Resources and Environment

基　　金：高等学校博士学科点专项科研基金课题(教育部博士点新教师基金;编号:20096118120016);中国博士后科学基金(编号:20080430543);陕西省教育厅基金(编号:09JK644)资助

摘　　要：通过测定和分析一个水文年内黄河潼关段河流悬浮物和底泥中有机质的碳同位素组成,发现该断面河流悬浮物的δ13C值在-27.4‰^-23.5‰之间变化,平均值为-24.9‰,冬季样品的δ13C值要明显偏负,显示出高比例的C3植物来源。河流底泥的δ13C值相对稳定,在-24.5‰^-23.4‰之间变化,平均值为-24.0‰。研究结果表明:河流悬浮物δ13C值的组成变化可以反映流域内植被组成状况的季节性变化,而河流底泥的δ13C值则代表了流域内长期平均的植被分布状况,受流域内季节性植被变化的影响较小。The organic carbon isotopic compositions of the suspended solids and sediments in Tongguan section were measured within a hydrological year.The δ13C values of the suspended solids varied from-27.4‰ to 23.5‰,with the mean value-24.9‰.Theδ13C values in winter were more negative than in other seasons,which showed the high ratio of C3 plant sources.The δ13C values of the river sediments varied narrowly from 24.5‰ to-23.4‰,with the mean value-24.9‰.The results show that the variation of δ13C values of the suspended solids reflected the seasonal change of plants in the basin,while the variation of δ13C values of the sediments indicated the average long-term plant distribution,which were less influenced by the seasonal change of plants in the basin.

关 键 词：地球化学 河流悬浮物及底泥 有机碳同位素 黄河潼关段 

分 类 号：X522[环境科学与工程—环境工程]