黄河利津站碳输运年内变化及入海通量估算  

Inter-annual variations and fuxes of riverine carbon at Lijin hydrological station in lower Yellow River

作　　者：邱爽[1] 刘志媛[1] 肖纯超[1] 张龙军[1] 

机构地区：[1]中国海洋大学海洋环境与生态教育部重点实验室,山东青岛266100

出　　处：《海洋环境科学》2013年第4期486-490,共5页Marine Environmental Science

基　　金：国家自然科学基金(41173107);海洋公益性专项(201305023)

摘　　要：通过2010年7月～2011年7月每月在黄河利津浮桥进行的水质观测,分析了黄河入海各形态碳的季节性变化及其可能原因,估算了各形态碳的月际及全年入海通量。结果表明,黄河利津站水体各形态碳浓度年内变化显著。溶解无机碳(DIC)浓度汛期明显低于非汛期,全年平均浓度为3.098 mmol/L。溶解有机碳(DOC)平均浓度为2.39 mg/L,全年变化趋势表现为春季最高,夏季次之但各月间变化幅度较大,冬季最低。DOC与溶解氧饱和度呈现负相关关系,陆源和人为污染输入的迹象明显。颗粒有机碳(POC)平均浓度为12.92 mg/L,与水体中悬浮颗粒物(TSS)含量线性关系良好,水体中的TSS含量是控制DOC/POC输运比例的主要因素。利津站DIC、DOC浓度在年度尺度上与径流量呈现负相关关系,稀释效应是其主体影响因素。但在雨致洪峰及调水调沙时期:泥沙输运量增大,无机碳酸盐固液平衡维持了较高的DIC浓度;强降雨地表冲刷、较高DOC浓度的库区水下泄,以及下泄水对下游干枯河道的冲刷,导致DOC浓度偏高。黄河各形态碳的月际入海通量整体表现出汛期高,非汛期低的特点,年内DIC、DOC及POC的年入海通量(以C计)分别为5.62×105t、3.97×104t和3.50×105 t。Variations and influencing factors of riverine carbon were studied based on the monthly monitored data,which were collected at the Lijin hydrological station from July 2010 to July 2011.In addition,we also estimated the inter-annual carbon fluxes.The results show that there are obvious seasonal changes of the concentration of riverine carbon.The concentration of dissolved inorganic carbon（DIC） in the flood period is significantly lower than that in the non flood period,and the annual concentration is 3.098 mmol/L.The annual average concentration of dissolved organic carbon（DOC） is 2.39 mg/L.DOC in spring is the highest,while in summer is lower and in winter the lowest.The negative correlation between DOC concentrations and Dissolved Oxygen saturation indicates the terrestrial and artificial pollution.The annual average concentration of particulate organic carbon（POC） is 12.92 mg/L and seasonal variations of POC are consistent with total suspended solid（TSS）,which is the main controls of DOC/POC transportation.DIC and DOC are negatively correlated with river discharge.The concentrations of DIC and DOC are high when the river discharge is large during the flood and the Water and Sediment Regulation（WSR）.The actual causes can be interpreted as follows： Heavy rain and WSR lead to a rapid increase of the discharge and TSS,DIC also increases due to the re-equilibration process of the carbonate system between the water-sediment interfaces.The strong washing-out effect and the release of reservoir water,in which there is much DOC,cause high DOC concentrations.By means of estimation,the fluxes of DIC,DOC and POC in the 2010 hydrological year（August 2010~July 2011）（calculate by C） were 5.62×105 tC,3.97×104 tC and 3.50×105 tC,respectively.And all of them showed a sensitive seasonally change,they are higher values in flood season and lower ones in dry season.

关 键 词：黄河 碳输运 入海通量 

分 类 号：X143[环境科学与工程—环境科学]