文献类型：期刊文献

英文题名：Spatiotemporal Dissolved Silicate Variation, Sources, and Behavior in the Eutrophic Zhanjiang Bay, China

作者：Zhang, Peng[1,2];Xu, Jia-Lei[1];Zhang, Ji-Biao[1,2];Li, Jian-Xu[1];Zhang, Yan-Chan[1];Li, Yi[1];Luo, Xin-Qi[1]

机构：[1]Guangdong Ocean Univ, Coll Chem & Environm Sci, Zhanjiang 524088, Peoples R China;[2]Southern Lab Ocean Sci & Engn Guangdong Zhanjiang, Zhanjiang 524088, Peoples R China

年份：2020

卷号：12

期号：12

外文期刊名：WATER

收录：SCI-EXPANDED(收录号：WOS:000602956600001)、、EI(收录号：20210109728331)、Scopus(收录号：2-s2.0-85098735630)、WOS

基金：The authors are grateful for the anonymous reviewers' careful review and constructive suggestions to improve the manuscript. Thanks are given to Research and Development Projects in Key Areas of Guangdong Province (2020B1111020004); Guangdong Ocean University Ph.D Fund Project (R18021); the Science and Technology Special Project of Zhanjiang city (2019B01081; 2019B01009); First-class Special Fund (231419018); Innovation Strong School Project (230420021) of Guangdong Ocean University.

语种：英文

外文关键词：spatiotemporal variation; dissolved silicate; land-based sources; coastal water; Zhanjiang bay

外文摘要：Dissolved silicate (DSi) is an important nutrient in coastal water, which is used by planktonic diatoms for cell division and growth. In this study, surface water samples were collected in the eutrophic Zhanjiang Bay (ZJB) in 2019, covering a seasonal variation of coastal water and land-based source water discharge. The spatiotemporal DSi distribution, land-based sources flux input and behaviors in ZJB were studied and discussed. The results show that the DSi concentration had significant differences in spatiotemporal scale. The average concentration of DSi in ZJB was 38.00 +/- 9.48 mu mol center dot L-1 in spring, 20.23 +/- 11.27 mu mol center dot L-1 in summer, 12.48 +/- 1.42 mu mol center dot L-1 in autumn and 11.96 +/- 4.85 mu mol center dot L-1 in winter. The spatiotemporal DSi distribution showed a decreasing gradient from the top to the mouth of ZJB, which was affected by land source inputs and hydrodynamics. The land-based sources' input concentration of DSi in ZJB ranged from 0.021 to 0.46 mol center dot L-1, with an average of 0.14 mol center dot L-1, and the total annual flux of DSi was 1.06 x 10(9) mol, comprising up to 8.28%, 41.55% and 50.17% in dry, normal, and wet seasons, respectively. The Suixi River contributed the highest DSi flux proportion in all seasons. The DSi in land-based source water was mainly affected by water flow discharge, diatom uptake and impacts from anthropogenic activities. Compared with dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphorus (DIP), the DSi was the limitation nutrient in ZJB. Additionally, the DSi concentration in the coastal water was negatively correlated with salinity. The seasonal DSi/DIN and DSi/DIP ratios in land-based sources discharge water was significantly higher than that in coastal water (p < 0.05). Land-based sources of DSi input played an important role in nutrients composition that sustained diatoms as the dominant species in ZJB.