Biogenic silica in intertidal marsh plants and associated sediments of the Yangtze Estuary  

作　　者：Lijun Hou Min Liu Yi Yang Dongni Ou Xiao Lin Hui Chen 

机构地区：[1]State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China. [2]Department of Geography, Key Laboratory of Geographical Information Science of the Ministry of Education, East China Normal University, Shanghai 200062, China

出　　处：《Journal of Environmental Sciences》2010年第3期374-380,共7页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No. 40701167, 40671171);the Doctoral Program Foundation of Ministry of Education of China (No. 20070269006);the State Key Laboratory of Estuarine and Coastal Research (No. 2008KYQN01,2008KYYW07)

摘　　要：Biogenic silica （BSi） contents in the marsh plants （Phragmites australis, Scirpus mariqueter and Spartina alterniflora） and associated sediments in Chongming Island eastern intertidal flat of the Yangtze Estuary were determined. The BSi contents in P. australis, S. mariqueter and S. alterniflora varied from 25.78–42.74 mg/g, 5.71–19.53 mg/g and 6.71–8.92 mg/g, respectively. Over the entire growth season, P. australis and S. mariqueter were characterized by linear accumulation patterns of BSi. The aboveground biomass （leaves and culms） of the marsh plants generally contained more BSi than underground biomass （roots）. BSi contents were relatively higher in dead plant tissues than in live tissues which was probably due to the decomposition and the leaching of labile components of plant tissues such as organic carbon and nitrogen. Comparing with the habitats of S. mariqueter and S. alterniflora, the highest BSi content was recorded in sediments inhabited by P. australis, with an annual average of 15.69 mg/g. Overall, the intertidal marshes in the Yangtze Estuary may act as a net sink of BSi via plant uptake and sedimentary burial.Biogenic silica （BSi） contents in the marsh plants （Phragmites australis, Scirpus mariqueter and Spartina alterniflora） and associated sediments in Chongming Island eastern intertidal flat of the Yangtze Estuary were determined. The BSi contents in P. australis, S. mariqueter and S. alterniflora varied from 25.78–42.74 mg/g, 5.71–19.53 mg/g and 6.71–8.92 mg/g, respectively. Over the entire growth season, P. australis and S. mariqueter were characterized by linear accumulation patterns of BSi. The aboveground biomass （leaves and culms） of the marsh plants generally contained more BSi than underground biomass （roots）. BSi contents were relatively higher in dead plant tissues than in live tissues which was probably due to the decomposition and the leaching of labile components of plant tissues such as organic carbon and nitrogen. Comparing with the habitats of S. mariqueter and S. alterniflora, the highest BSi content was recorded in sediments inhabited by P. australis, with an annual average of 15.69 mg/g. Overall, the intertidal marshes in the Yangtze Estuary may act as a net sink of BSi via plant uptake and sedimentary burial.

关 键 词：biogenic silica marsh plants intertidal flat the Yangtze Estuary 

分 类 号：Q948.158[生物学—植物学] P736.41[天文地球—海洋地质]