中文关键词澜沧江沉积物-水体界面扩散通量营养盐空间分布 英文关键词Lancang Riversediment-water interfacediffusion fluxnutrientsspace distribution

作者	单位	E-mail
望雪	湖北工业大学土木建筑与环境学院, 河湖生态修复与藻类利用湖北省重点实验室, 武汉 430068	kazuwxx@126.com
程豹	湖北工业大学土木建筑与环境学院, 河湖生态修复与藻类利用湖北省重点实验室, 武汉 430068
杨正健	湖北工业大学土木建筑与环境学院, 河湖生态修复与藻类利用湖北省重点实验室, 武汉 430068	Yangjian198422@163.com
刘德富	湖北工业大学土木建筑与环境学院, 河湖生态修复与藻类利用湖北省重点实验室, 武汉 430068
徐雅倩	湖北工业大学土木建筑与环境学院, 河湖生态修复与藻类利用湖北省重点实验室, 武汉 430068

中文摘要 为分析澜沧江梯级水库建设对澜沧江流域沉积物-水界面交换过程的影响，于2016年2~3月对澜沧江云南段间隙水-上覆水氮、磷营养盐进行了调查与分析.结果表明，澜沧江自然河道沉积物间隙水总氮（TN）均值为15.254mg·L^-1，显著高于水库均值6.577mg·L^-1；但其总磷（TP）均值为0.654mg·L^-1，低于水库区域的1.432mg·L^-1.澜沧江流域沉积物间隙水氮、磷浓度均高于上覆水浓度，上覆水-间隙水垂向TN浓度在表层沉积物处达到最大值，且自然河道总溶解氮（DTN）扩散通量均值为2.117mg·（m²·d）^-1，高于水库的均值0.785 mg·（m²·d）^-1；但其总溶解磷（DTP）扩散通量为0.044mg·（m²·d）^-1，低于水库的均值0.053 mg·（m²·d）^-1，上覆水氮盐主要来源于沉积物间隙水.澜沧江梯级水库建设导致的沉积物组成差异与水体扰动差异是间隙水-上覆水界面交换差异的主要原因. 英文摘要 A field survey was carried out to investigate the diffusive fluxes of nitrogen and phosphorus from sediment in the natural river areas and cascaded reservoirs in the Lancang River Basin from February through March in 2017. In the natural river areas, the mean value of total nitrogen (TN) concentrations in the sediment pore water was about 15.254 mg ·L^-1, and the total phosphorus (TP) was only 0.654 mg ·L^-1; while in the reservoirs, the mean value of TN and TP were 6.577 mg ·L^-1 and 1.432 mg ·L^-1, respectively. Both nutrients in the overlying water were less than that in the sediment pore water. The mean diffusive flux of total dissolved nitrogen (DTN) was almost 2.117 mg ·(m² ·d)^-1 in the natural river areas, and the mean value of total dissolved phosphorus (DTP) was 0.044 mg ·(m² ·d)^-1, while the mean value of DTN and DTP were 0.785 mg ·(m² ·d)^-1 and 0.053 mg ·(m² ·d)^-1 in the reservoirs, respectively. The TN content reaches the maximum in the overlying water-interstitial water vertical surface sediments. It was concluded that cascaded hydropower had greatly changed the nutrient exchange between the sediment and overlying water. Different hydrodynamics and varied chemical environments in the sediment could be additional causes.

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