【摘要】 对2009年3月28～29日利用沉积物捕获器在九龙江河口区分层收集的沉降颗粒物分别进行了激光粒度、X射线衍射、扫描电镜和能谱分析,分析了沉降颗粒物的粒度特征和粘土矿物组成特征,并探讨了九龙江河口水体沉降颗粒物类型及其絮凝沉积作用.结果表明:各站各层沉降颗粒物有不同的粒度组成和粘土矿物组成特征,单颗粒沉降颗粒物类型主要有3种类型(生物、矿物和其他颗粒);沉降颗粒物絮凝体类型则有5种主要类型,包括被囊类、硅藻等生物形成的絮凝体,粪球、矿物碎屑等形成的絮凝体以及由生物和有机质等形成的混杂絮凝体.研究区沉降颗粒物的类型受到地形、径流、潮流的影响,影响研究区沉积颗粒物分布的主要原因包括陆源碎屑物质的输入和人类活动的影响.颗粒物絮凝还受到河口区水体的盐度、有机物的吸附等诸多因素的影响.更多还原

【Abstract】 The settling particulate matters were collected respectively by sedimentation trap in Jiulongjiang Estuary from March 28 to March 29 in 2009.Laser particle size analysis,X-ray diffraction,Scanning Electron Microscope(SEM) and Energy Disperse Spectroscopy(EDS) analysis were applied for the analyses.The grain-size characteristics and the clay mineral composition characteristics were analyzed.The types of settling particulate matter(SPM) and their flocculating sedimentation are discussed.It shows that the different layer settling particulates have different particle size and clay mineral composition characteristics.The types of single particle are composed of biology and minerals,and other particles while the flocs types of SPM are of larvacean houses and diatom,of mineral debris and fecal matters and the mixed flocs of biological and organic maters.The types of SPM are affected by topography,runoff and currents while the main factors that affect the distribution of SPM are terrestrial detritus input and human activity.Besides,particulate flocculation is also affected by many factors such as salinities in the estuarine and organic adsorptions.更多还原