Time filter

Source Type

Hu S.Y.,Qingdao University | Zhao Q.S.,Qingdao University | Ma J.Y.,Qinghai AVIC Resources Company Ltd | Ma J.Y.,Qaidam Integrated Geological Exploration Institute of Qinghai Province | And 2 more authors.
Water Resources and Environment - Proceedings of the International Conference on Water Resources and Environment, WRE 2015 | Year: 2016

The samples from pressurized brine in Mahai potash area were characterized by hydrochemical analysis. Based on their hydrochemical types and other analyzing results, the formation reason on the pressurized brine was inferred. By analyzing the scatter diagrams for the salinity and element concentration of pressurized brine, the change rules for the element concentration were found in the process of evaporating and concentrating the pressurized brine. Firstly, the element concentrations of Na+, Li+, SO2− 4 raise with increasing the salinity of pressurized brine. Secondly, the element concentrations of K+, Ca+ decrease with increasing the salinity of pressurized brine. Thirdly, the element concentrations of Rb+, Sr2+, HCO− 3 changes randomly with increasing the salinity of pressurized brine. By analyzing the correlation between these elements, it is found that the different elements have the same one replenishment sources. The results could be referenced in exploring and developing the potash salts of pressurized brine in Mahai potash area in Qinghai province. © 2016 Taylor & Francis Group, London. Source

Xu G.,CAS Qingdao Institute of Oceanology | Liu J.,CAS Qingdao Institute of Oceanology | Pei S.,CAS Qingdao Institute of Oceanology | Pei S.,Key Laboratory of Coastal Wetland Biogeosciences | And 2 more authors.
Environmental Science and Pollution Research | Year: 2015

Surface sediment grain size as well as the spatial distribution, pollution status, and source identification of heavy metals in the west Zhoushan Fishing Ground (ZFG) of the East China Sea were analyzed to study the geochemical background concentrations of heavy metals and to assess their potential ecological risk. Our results show that surface sediments in the eastern part of study area were mainly composed of sand-sized components. Spatial distributions of heavy metals were mainly controlled by grain size and terrigenous materials, and their concentrations in the coarsest grain sediments formed primarily during the Holocene transgressive period could represent the element background values of our study area. Contamination factor suggests that there was no pollution of Pb, Zn, and Cr generally in our study area and slight pollution of Cu, Cd, and As (especially Cu) at some stations. In addition, ecological harm coefficient indicates that the ecological risk of each heavy metal, except for Cd, at two stations was low as well. These results are consistent with the pollution load index and ecological risk index, which suggest both the overall level of pollution and the overall ecological risk of six studied metals in sediment were relatively low in our study area. Enrichment factor indicates that the heavy metals came mostly from the natural source. Summarily, the quality level of sediment in our study area was relatively good, and heavy metals in sediments could not exert threat to aquatic lives in the ZFG until now. © 2015, Springer-Verlag Berlin Heidelberg. Source

Yang S.,Key Laboratory of Coastal Wetland Biogeosciences | Yang S.,The Key Laboratory of Marine Hydrocarbon Resources and Environment Resources | Yang S.,Sun Yat Sen University | Zheng Z.,Sun Yat Sen University | And 5 more authors.
Review of Palaeobotany and Palynology | Year: 2015

Pollen keys are essential for accurate and consistent identification of Quaternary pollen, as well as pre-Quaternary fossil pollen, which in turn enables a better understanding of past biodiversity and vegetation changes. Here, we present a pollen key to 52 species of arboreal and liana plants from 26 families on tropical Hainan Island, covering representative pollen types identified in tropical Chinese Quaternary deposits. Such a pollen key along with detailed descriptions and illustrations should enable fossil pollen to be accurately identified. Nevertheless, the key is open for future improvement, so that pollen of other plants from the same study area can be accommodated when specimens become available. In their present state they should, however, aid palynological analyses of Quaternary deposits, particularly in tropical south China. Pollen identification as well as the palaeoecological and palaeobiogeographical significance of the key representative communities along the altitudinal gradient in our study area (i.e., coastal mangroves, tropical rainforest and montane rainforest) are also discussed in this paper. © 2015 Elsevier B.V. Source

Wang F.,CAS Qingdao Institute of Oceanology | Gao M.,CAS Qingdao Institute of Oceanology | Liu J.,CAS Qingdao Institute of Oceanology | Pei S.,CAS Qingdao Institute of Oceanology | And 5 more authors.
Marine Micropaleontology | Year: 2016

Surface sediment samples at 80 stations were collected from Laizhou Bay in the Bohai Sea, and the live and dead foraminifera were analyzed in order to understand the relationship between foraminiferal assemblages and environmental factors. Four representative zones (A, B, C and D) of natural stations were classified by the Hierarchical Cluster Analysis (HCA), based on the total (live plus dead) relative abundances of 25 species commonly observed in the study area. The distribution patterns of benthic foraminifera, especially the characteristic species, responded well to the slightly varying environment. In Zone A, the nearly consistent structural components of live and dead foraminifera indicate that there was no massive transportation process. Their distribution was mainly controlled by the deeper water depth, a higher bottom salinity and coarse sandy silt (ST) content. In Zone B, the high proportion of living miliolid tests might be related to the high-salinity tongues along the southern Laizhou Bay towards its center. The dilution effect of high sedimentation rate along the southern Yellow River (Huanghe) mouth led to the sparse amount of foraminiferal tests in Zone C. However, complex environmental factors limited the distribution and postmortem taphonomic process of the benthic foraminifera in Zone D. Under the coactions of large amounts of freshwater and nutrient from the Yellow River and some small rivers located in the western study area, and silt (T) substrates mainly from the suspended sediments of the Yellow River, the living group Cribrononion subincertum (Asano) and agglutinated species dominated in Zone D. Besides, part of the allochthonous miliolid tests from Zone B might have been transported and reburied along with the autochthonous species in Zone D due to the bottom circulation. Moreover, the small- and thin-shelled species C. subincertum that dominated in the living assemblages was poorly preserved or totally absent in the dead groups. It may have been transported as suspended load and redeposited by the circulation flowing towards the outer bay. © 2015 Elsevier B.V. Source

Xu G.,CAS Qingdao Institute of Oceanology | Xu G.,Key Laboratory of Coastal Wetland Biogeosciences | Liu J.,CAS Qingdao Institute of Oceanology | Pei S.,CAS Qingdao Institute of Oceanology | And 3 more authors.
Journal of Geochemical Exploration | Year: 2016

The geochemical background concentration (GBC) of potentially toxic metals in coastal surface sediments is a useful reference to assess the extent of sediment contamination caused by human activities. Using surface sediments collected from the Zhejiang coastal mud area of the East China Sea, a regional GBC function (GBCF) for potentially toxic metals in sediments was constructed based on statistical techniques. Principal component analysis (PCA) was utilized to identify potentially toxic metal sources. For potentially toxic metals of natural origin, the GBCF was developed by directly fitting concentration with Al2O3 in a linear regression model. For potentially toxic metals of anthropogenic origin, concentration data were normalized with Al2O3 to eliminate the influences of grain size and mineral, and cleaned by the cumulative distribution function before linear regression analyses. At each sampling station, the enrichment factor (EF) was modified by the corresponding GBC calculated from the GBCF, and was then applied to identify metal sources. The EF results were consistent with those of the PCA and correlation analyses, indicating that the GBCs of potentially toxic metals at each station were applicable. The approach used in this study will be useful for assessing potentially toxic metal pollution in sediment and managing sediment quality. © 2016 Elsevier B.V. Source

Discover hidden collaborations