Metal speciation in salt marsh sediments: Influence of halophyte vegetation in salt marshes with different morphology
作者： Sílvia Pedro , Bernardo Duarte , Pedro Raposo de Almeida , Isabel Caçador
DOI: 10.1016/J.ECSS.2015.05.034
关键词: Salt marsh 、 Species distribution 、 Sediment 、 Marsh 、 Salinity 、 Botany 、 Spartina maritima 、 Halimione portulacoides 、 Chemistry 、 Halophyte
摘要: Abstract Salt marshes provide environmental conditions that are known to affect metal speciation in sediments. The elevational gradient along the marsh and consequent differential flooding some of major factors influencing halophytic species distribution coverage due their tolerance salinity submersion. Different species, turn, also have distinct influences on sediment's speciation, its accumulation abilities. present work aimed evaluate how different halophyte two salt could influence partitioning sediment at root depth differ from bare Metal sediments around roots (rhizosediments) Halimione portulacoides , Sarcocornia fruticosa Spartina maritima was determined by sequentially extracting operationally defined fractions with solutions increasing strength acidity. Rosario generally showed higher concentrations all metals rhizosediments. primarily related type metal, elements' chemistry overriding environment's fractionation schemes. most mobile elements were Cd Zn, greater availability being found non-vegetated Immobilization rhizosediments predominantly influenced presence Fe Mn oxides, as well organic complexes. In more mature both marshes, differences between vegetated evident regarding S. fruticosa while younger system halophytes presented significantly when compared mudflats.
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