Influence of mangrove reforestation on heavy metal accumulation and speciation in intertidal sediments

Ecological risk assessments and context-dependence analysis of heavy metal contamination in the sediments of mangrove swamp in Leizhou Peninsula, China

“…Mangrove vegetation increases fine particle and organic matter content in the upper sediment layers, which can trap heavy metals from overlying water (Zhou et al, 2010). The accumulation of fine particles in the upper sediment layers may directly contribute to the increase in metal concentrations, because fine particles usually include more metals than coarse particles (N0.063 mm) in an estuarine environment (Deely and Fergusson, 1994).…”

“…On the other hand, mangrove results in rapid acidification of sediments. This may be caused by the microbial decomposition of mangrove letter and oxidation of FeS 2 and FeS (Zhou et al, 2010), and the secretion of root exudates. Different carboxylic acids, strong organic acids, alcohols, carbohydrates and proteins are components of root exudates, especially the range of low-molecular-weight organic acids, which were responsible for increasing bioavailability of metals in sediments near the rhizosphere (Liu et al, 2014).…”

Interactions Between Environmental Factors and Zinc Concentrations in Porewater and Roots of Rhizophora sp. in Ampallas, Mamuju, West Sulawesi, Indonesia

“…In study location, organic matters were higher in sediments that contain higher silt/clay percentages because silt/clay textures were more capable in trapping organic matter as well as binding with metals compared to sand, which due to their high specific surface area (Marchand et al, 2006). Therefore, higher concentrations of metals, including Zn were found in fine-grained soils than in sandy soils (Abraham, 2007), including in mangrove areas (Tam and Wong, 2000;Zhou et al, 2010).…”

“…In fact, the porewater Zn associated with organic content and silt/clay percentage, where the concentrations of dissolved Zn in porewater increased as the percentages of organic content and silt clay increased. Soil organic matter, soil type, and clay mineral content can influence Zn sorption in soil (Bradl et al 2005;Zhou, Zhao, Peng, & Chen, 2010;Kabata-Pendias, 2011), and become some of the primary Zn fractions found in the environment (Broadley et al 2007). In study location, organic matters were higher in sediments that contain higher silt/clay percentages because silt/clay textures were more capable in trapping organic matter as well as binding with metals compared to sand, which due to their high specific surface area (Marchand et al, 2006).…”

Assessment of Heavy Metal Pollution in Mangrove Sediments of Chuuk and Kosrae, Federated States of Micronesia

“…Results of Al, TOC, TN and heavy metals concentration in surface mangrove sediments from Chuuk and Kosrae, FSM (White and Tittlebaum 1985;Murray 1996), 우리나라 역시 해저 퇴적물의 주의기준 (TEL)과 관리기준(PEL)이 마련되기 전에는 Cr과 Ni이 오 염되어 있으며 생태계에 악영향을 줄 가능성이 높은 것으 로 보고된 바 있다 (Kim et al 2009). 맹그로브 지역은 생산성이 매우 높은 환경 및 생태계로 거주민의 다양한 서식지를 제공하거나 다양한 먹이원을 공급하고 있다 (Zhou et al 2010). 또한 중금속은 맹그로브 퇴적물 내 유기물 형태(organic fraction), 수용성 형태 (water-soluble fracction) 및 이온교환성 형태(exchangeable fraction)로 존재하고 있기 때문에 (Chiu and Chou 1991;Tam and Wong 1996;Izquierdo et al 1997 …”