九龙江口滨海湿地生源要素空间分布特征  

Spatial Variations of Biogenic Elements in Coastal Wetland Sediments of the Jiulong River Estuary

作　　者：余小青[1] 杨军[1] 刘乐冕[1,2] 田原[1,3] 余正[1,2] 王昌付[1] 

机构地区：[1]中国科学院城市环境研究所,城市环境与健康重点实验室水生态健康组,厦门361021 [2]中国科学院大学,北京100049 [3]香港科技大学工程学院土木与环境工程系,中国香港

出　　处：《环境科学》2012年第11期3739-3747,共9页Environmental Science

基　　金：中国科学院知识创新工程重要方向项目(KZCX2-YW-Q02-04);科技部国际科技合作项目(2011DFB91710);厦门市科技计划杰出青年项目(3502Z20116006);中国科学院优秀博士学位论文、院长奖获得者科研启动专项资金项目;教育部留学回国人员科研启动基金项目

摘　　要：为了揭示亚热带典型滨海湿地生源要素的空间分布特征及影响因素,选取九龙江口滨海湿地为研究对象,于2009年夏采集表层沉积物及柱状样,利用元素分析仪和流动注射分析仪对主要生源要素碳、氮、磷、硫(C、N、P、S)进行分析.结果表明,九龙江口滨海湿地生源要素含量较高,总碳、总氮、总磷、总硫(TC、TN、TP、TS)的均值分别为(12.64±2.66)、(1.57±0.29)、(0.48±0.06)、(2.61±1.37)g·kg-1,空间分布差异性显著.红树林植被区表层沉积物的TC、TN、TP含量高于米草植被及光滩,高潮位TC、TN、TP含量>中潮位>低潮位,TS在米草植被及中潮位含量较高.柱状样的TC、TN具有相似的垂直变化趋势,均表现为由表层向下逐渐降低,且不同植被间的柱状样TC、TN含量在同一深度上都表现为:红树区>米草区>光滩区;柱状样TP平均值是光滩最低,TS平均值是光滩最高.冗余分析表明,植被类型、pH及潮位是影响表层沉积物生源要素(C、N、P、S)分布最显著的环境因子,解释量分别为24.0%、19.0%和11.6%.To reveal the spatial distribution of biogenic elements and their influencing factors in the typical subtropical coastal wetland,both surface and core sediment samples were collected from the Jiulong River Estuary,southeast China in summer 2009.The biogenic elements including carbon,nitrogen,phosphorus,sulfur（C,N,P,S） were determined by Element Analyzer and Flow Injection Analyzer.The concentrations of TC,TN,TP,and TS were（12.64±2.66） g·kg-1,（1.57±0.29） g·kg-1,（0.48±0.06） g·kg-1,and（2.61±1.37） g·kg-1,respectively.Further,these biogenic elements showed a distinct spatial pattern which closely related with the vegetation type and tide level.Values of TC,TN,TP in the surface sediment of mangrove vegetation zones were higher than those in the cord-grass and mudflat zones,while TC,TN,TP concentrations in the high tide level regions were higher than those in the middle and low tide level regions.The TS concentration was the highest in cord-grass vegetation and middle tidal level zones.The TC and TN values in sedimentary core decreased gradually with depth,and they were the highest in the mangrove sites,followed by cord-grass and mudflat sites at the same depth.In mudflat sedimentary core,the average content of TP was the lowest,whereas TS was the highest.Redundancy analysis revealed that vegetation type,pH and tide level were the main factors influencing the distribution of biogenic elements in surface sediments of the Jiulong River Estuary,by explaining 24.0%,19.0% and 11.6% of total variation in the four biogenic elements（C,N,P and S）,respectively.

关 键 词：沉积物 碳、氮、磷、硫 滨海湿地 红树 米草 光滩 

分 类 号：X142[环境科学与工程—环境科学]