Yang Dan, Wu Jiajia, Yan Lingbin, Yu Lifei, Liu Jingchun, Yan Chongling
Key Laboratory of Plant Resource Conservation and Germplasm Innovation in Mountainous Region, Collaborative Innovation Center for Mountain Ecology & Agro-Bioengineering, College of Life Sciences, Guizhou University, Guiyang 550025, China; State Key Laboratory of Marine Environmental Science, Key Laboratory of the Coastal and Wetland Ecosystems, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China.
State Key Laboratory of Marine Environmental Science, Key Laboratory of the Coastal and Wetland Ecosystems, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China.
Sci Total Environ. 2022 Feb 1;806(Pt 3):151220. doi: 10.1016/j.scitotenv.2021.151220. Epub 2021 Oct 27.
Elevated sediment-bound trace elements and iron-bearing minerals in intertidal habitats have been drawing more attention, but there is rarely a comparative study assessing these features between halophyte plants habitat and mudflats. In this paper, sediment samples were collected in S. alterniflora and the corresponding mudflat at 7 typical intertidal habitats (Chongming, Xiapu, Yueqing, Yunxiao, Zhanjiang, Beihai, and Zhuhai) from north to south of China, respectively. Trace element concentrations, including arsenic (As), mercury (Hg), cadmium (Cd), antimony (Sb) and scandium (Sc), and magnetic characteristics were determined. Variations in sediment-bound As, Hg, Cd, Sb were associated with S. alterniflora. Accumulations of sediment-bound As, Hg, Sb, Cd and Sc in S. alterniflora in Beihai were much higher than those in the mudflat. Concentration of sediment-bound As, Hg, Sb, Cd and Sc in S. alterniflora and mudflat were comparable in Yueqing, Xiapu, Yunxiao and Zhanjiang, respectively. Variations in low-frequency susceptibility, susceptibility of anhysteretic remanence magnetization, saturation isothermal remanence magnetization and frequency dependent susceptibility can explain the site-dependent accumulation of magnetic minerals in intertidal habitats. S. alterniflora tend to deplete sediment magnetic concentration and enhance sediment-bound As, Hg, and Sb concentration. The results of our study further revealed the coexistence of trace elements and magnetic minerals between the sampling sites and vegetative in intertidal habitats.
潮间带栖息地中与沉积物结合的微量元素和含铁矿物含量升高已受到越来越多的关注，但很少有比较研究评估盐生植物栖息地和泥滩之间的这些特征。本文分别在中国从北到南的7个典型潮间带栖息地（崇明、霞浦、乐清、云霄、湛江、北海和珠海）的互花米草和相应的泥滩中采集了沉积物样本。测定了包括砷（As）、汞（Hg）、镉（Cd）、锑（Sb）和钪（Sc）在内的微量元素浓度以及磁性特征。沉积物结合态的砷、汞、镉、锑的变化与互花米草有关。北海互花米草中沉积物结合态的砷、汞、锑、镉和钪的积累量远高于泥滩。乐清、霞浦、云霄和湛江的互花米草和泥滩中沉积物结合态的砷、汞、锑、镉和钪的浓度分别相当。低频磁化率、非滞磁性剩磁磁化率、饱和等温剩磁磁化率和频率依赖性磁化率的变化可以解释潮间带栖息地中磁性矿物的位点依赖性积累。互花米草倾向于降低沉积物磁性浓度并提高沉积物结合态的砷、汞和锑浓度。我们的研究结果进一步揭示了潮间带栖息地采样点与植被之间微量元素和磁性矿物的共存情况。
