Coastal water quality assessment and groundwater transport in a subtropical mangrove swamp in Daya Bay, China

Xiao, Kai1; Li, Hailong1,2,3; Shananan, Meghan4; Zhang, Xiaoying5; Wang, Xuejing1; Zhang, Yan2,3; Zhang, Xiaolang1; Liu, Haiyan2,3

2019-01

10.1016/j.scitotenv.2018.07.394

SCIENCE OF THE TOTAL ENVIRONMENT   影响因子和分区

0048-9697

1879-1026

Coastal water quality assessment is challenging due to the complex hydrological environment in mangrove swamps. Such assessment requires a good understanding of swamp hydrology and potential solute reactions. In this study, we investigated the concentration variations of a suite of major elements (Na+, K+, Ca2+, Mg2+, SO42-, HCO3- and Cl-), nutrients such as dissolved inorganic phosphorous (DIP) and silicate (DSi), and heavy metals (Cu, Zn, As, Hg, Cd, Pb and Cr) along a typical mangrove transect in Daya Bay, China. The transect comprises a tidal creek, a mudflat and two mangrove zones. The major elements exhibited various degrees of dilution and loss, such as losses of K+ due to uptake by mangrove trees and of SO42- due to microbial sulfate reduction. Numerical simulations of groundwater flow showed that the inland fresh groundwater can continuously discharge through the landward mangrove zone, where high concentrations of DIP and DSi occurred. However, the middle mangrove zone served as a sink of DIP and DSi due to the weak hydrodynamic environment. The spatial distribution of heavy metal concentrations showed that only Cu pollution occurred in the creek zone. The Metal Pollution Index (MPI) was developed to compare the enrichment capability of heavy metals at the different sampling sites. Results showed that the intertidal groundwater has the strongest heavy metal enrichment capability, followed by sea water, inland groundwater and river water. Within the intertidal zone, the creek zone has the highest MPI, followed by the mangrove zone and the mudflat zone. The local water circulation occurred around the creek should contribute the high MPI in the creek zone. (C) 2018 Elsevier B.V. All rights reserved.

Coastal wetlands Intertidal zone Numerical simulation Groundwater flow Nutrients Heavy metal

SCI ; EI

英语

第一 ; 通讯

Key Program of National Natural Science Foundation of China[41430641]

Environmental Sciences & Ecology

Environmental Sciences

WOS:000445164800138

ELSEVIER SCIENCE BV

20183105646701

Computer simulation ; Groundwater ; Groundwater flow ; Heavy metals ; Numerical models ; Nutrients ; Seawater ; Silicates ; Sulfur compounds ; Tropics ; Water quality ; Wetlands

Meteorology:443 ; Groundwater:444.2 ; Water Analysis:445.2 ; Water Pollution:453 ; Seawater, Tides and Waves:471.4 ; Metallurgy and Metallography:531 ; Computer Applications:723.5 ; Mathematics:921

ENVIRONMENT/ECOLOGY

Web of Science

1.Southern Univ Sci & Technol, Guangdong Prov Key Lab Soil & Groundwater Pollut, Sch Environm Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China
2.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Beijing 100083, Peoples R China
3.China Univ Geosci, Sch Water Resources & Environm Sci, Beijing 100083, Peoples R China
4.Univ South Carolina, Sch Earth Ocean & Environm, Columbia, SC 29208 USA
5.Jinan Univ, Inst Groundwater & Earth Sci, Guangzhou 510632, Guangdong, Peoples R China

Xiao, Kai,Li, Hailong,Shananan, Meghan,et al. Coastal water quality assessment and groundwater transport in a subtropical mangrove swamp in Daya Bay, China[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2019,646:1419-1432.

Xiao, Kai.,Li, Hailong.,Shananan, Meghan.,Zhang, Xiaoying.,Wang, Xuejing.,...&Liu, Haiyan.(2019).Coastal water quality assessment and groundwater transport in a subtropical mangrove swamp in Daya Bay, China.SCIENCE OF THE TOTAL ENVIRONMENT,646,1419-1432.

Xiao, Kai,et al."Coastal water quality assessment and groundwater transport in a subtropical mangrove swamp in Daya Bay, China".SCIENCE OF THE TOTAL ENVIRONMENT 646(2019):1419-1432.