Assessment ecological risk of heavy metal caused by high-intensity land reclamation in Bohai Bay, China

Abstract

The article examines the detailed spatial and temporal distributions of coastal reclamation in the northwest coast of Bohai Bay experiencing rapid coastal reclamation in China from 1974 to 2010 in annual intervals. Moreover, soil elements properties and spatial distribution in reclaimed area and inform the future coastal ecosystems management was also analyzed. The results shows that 910.7 km2 of coastal wetlands have been reclaimed and conversed to industrial land during the past 36 years. It covers intertidal beach, shallow sea and island with a percentage of 76.0%, 23.5% and 0.5%, respectively. The average concentration of Mn is 686.91mg/kg and the order of concentration of heavy metal are Cr>Zn>As>Ni>Cu>Pb>Cd>Hg. We used the "space for time substitution" method to test the soil properties changes after reclamation. The potential ecological risk of heavy metal is in low level and the risk of Cd and As is relatively higher. The ecosystem-based coastal protection and management are urgent to support sustainable coastal ecosystems in Bohai bay in the future.

Bacterioplankton community variation in Bohai Bay (China) is explained by joint effects of environmental and spatial factors

“…Meanwhile, the sampling time of this study was during the rainfall periods which may contribute to water inputs (the Jiyun river and Haihe river pour into the Bohai Bay), potentially yielding more similarly composed bacterial communities due to the movement of water masses (Langenheder & Ragnarsson, 2007). Secondly, unmeasured variables may contribute for the unexplained BCC variation, which may include abiotic environmental variables such as heavy metals, which constitute a known ecological risk in Bohai Bay (Zhu et al, 2017), as well as TOC (Zheng, Wang, & Liu, 2014) and DOM (Judd, Crump, & Kling, 2006), or biological factors such as chlorophyll a (Qiao et al, 2017), macrophytes, and phytoplankton composition (Niu et al, 2011;Wu et al, 2007). Nonetheless, the main factors which were reported as significant determinants (temperature, DO, salinity, pH, COD, nitrite, nitrate, AN, SRSi, and SRP) were mostly included in this study.…”

“…It was reported that the seawater quality has deteriorated rapidly in recent years. Many studies of this area had focused either on the primary pollutants such as nitrogen and phosphate enrichment (Chen et al, ; Qiao et al, ), heavy metal pollution (Zhu, Xie, Li, Ma, & Xu, ) or on the aquatic plants and animals (Guo, Li, & Zhang, ; Qiao et al, ; Yang et al, ). By contrast, studies on microorganisms in the Bohai Bay are relatively few, this research focused on the region of Bohai Bay, which is relatively stable and suitable for biogeographical research.…”

Impacts of Coastal Reclamation on Natural Wetlands in Large River Deltas in China

“…A large number of literatures showed that coastal reclamation was the significant driving force for coastal wetland loss (Murray et al, 2014;Cui et al, 2016;Ma et al, 2019a). Various ecological processes, including hydrology, sediment deposition, plant evolution and landscape connectivity had been altered by human activities (Lotze et al, 2006;Barnard et al, 2013;Wang et al, 2014;Chen et al, 2016;Zhu et al, 2017;Mou et al, 2018). These changes usually caused the degradation or loss of wetlands and presented as wetland area loss at a regional scale.…”

“…The objectives of this paper are to explore the impacts of coastal reclamation on natural wetlands by the comparison of multiple deltas and to assess the reclamation mode to give practical suggestions for coastal conserva-tion and management. Four major river deltas in China were used as case studies, where natural wetlands were widely distributed while anthropogenic activities were dramatically expanded (Bianchi and Allison, 2009;Li et al, 2012;Chen et al, 2016;Zhu et al, 2017). We tracked the continuous change in the area of natural wetlands and coastal reclamation in four periods from 1978 to 2014 by available remote sensing images.…”

Seasonal variations and risk assessment of heavy metals in PM2.5 from Handan, China

“…In recent decades, plenty of research studies have been carried out on mass concentration, seasonal characteristic, spatial characteristic, source, pollution level, health risk and ecological risk of HMs in PM 2.5 (Querol et al, 2002;Thomaidis et al, 2003;Kong et al, 2011;Wang et al, 2013aWang et al, , 2013bZhu et al, 2017;Guo et al, 2018;Tian et al, 2018;Zhu et al, 2018;Lei et al, 2019). Pollution of HMs in PM 2.5 occurs in all regions, yet the pollution characteristics of HMs vary from region to region because of the differences of natural conditions and human activities (Park et al, 2008;Perrone et al, 2014;Tao et al, 2017;Zhang et al, 2018;Lu et al, 2019).…”