丰水期和枯水期大樟溪下游表层水体不同形态硅含量的差异及其影响因素  

Different Forms of Silicon and Its Influencing Factors in the Lower Reach of Dazhangxi River inWet and Dry Seasons

作　　者：俞新慧 翟水晶[1,2,3] 邱思婷 王赛 YU Xinhui;ZHAI Shuijing;QIU Siting;WANG Sai(Institute of Geography,Fujian Normal University,Fuzhou 350007,Fujian,P.R.China;Key Laboratory of Humid Subtropical Eco-geographical Process,Ministry of Education,Fujian Normal University,Fuzhou 350007,Fujian,P.R.China;College of Geographical Sciences,Fujian Normal University,Fuzhou 350007,Fujian,P.R.China)

机构地区：[1]福建师范大学地理研究所,福建福州350007 [2]福建师范大学湿润亚热带生态地理过程教育部重点实验室,福建福州350007 [3]福建师范大学地理科学学院,福建福州350007

出　　处：《湿地科学》2023年第1期131-139,共9页Wetland Science

基　　金：福建省公益类项目(A21FKYN00917K01)资助。

摘　　要：硅元素是硅藻和水生植物所必需的营养元素,河流的水文特性对其形态和含量具有重要影响。2019年7月(丰水期)和11月(枯水期),在闽江支流大樟溪下游采集表层水样,比较水体中不同形态硅、溶解性氮磷以及其它理化指标在丰水期和枯水期的差异。结果表明,大樟溪下游表层水体溶解态硅、成岩硅和活性硅含量在丰水期高于枯水期,而生物硅和颗粒态硅含量则反之,这与水体pH、悬浮颗粒物、电导率和溶解性氮磷浓度相关;从水体中各营养元素的化学计量比来看,大樟溪下游表层水体表现为明显的磷限制,营养盐浓度和硅氮比都表明大樟溪水体有利于硅藻类的生长;大樟溪水体长期输入闽江,对闽江下游及河口水体的营养盐平衡具有一定威胁,容易导致近海水域富营养化现象的发生。Silicon is an essential nutrient for diatoms and aquatic plants.Surface water samples were collected from the lower reach of Dazhangxi River,a tributary of Minjiang River,in July(defined as wet season)and November(defined as dry season)in 2019.Contents of different forms of silicon,total dissolved nitrogen,total dissolved phosphorus and other physical and chemical indexes in the water were determined.Results showed that the contents of dissolved silicon,lithogenic silica and reactive silica in the wet season were higher than those in the dry season,while the contents of particulate biogenic silica and particulate silica were on the contrary.We also found that pH,suspended particulate matter,electrical conductivity and the concentrations of total dissolved nitrogen and total dissolved phosphorus had some correlation with the contents of different forms of silicon.The results of elements stoichiometric ratios indicated that the surface water in the lower reach of Dazhangxi River was obviously phosphorus limited with higher ratio of silicon to nitrogen,which implied that it was beneficial to the growth of diatoms.The long-term input of silicon from Dazhangxi River into Minjiang River would possibly threaten the nutrient balance of its lower reach and the estuary,which would easily cause eutrophication in the offshore waters.

关 键 词：溶解态硅 成岩硅 颗粒态生物硅 丰水期和枯水期 大樟溪 

分 类 号：X522[环境科学与工程—环境工程]