不同盐度下盐地碱蓬土壤中汞和甲基汞含量及汞甲基化的变化。
Changes of mercury and methylmercury content and mercury methylation in Suaeda salsa soil under different salinity.
机构信息
Environmental College, Shenyang University, Shenyang, 110044, China.
Key Laboratory of Eco-Restoration of Regional Contaminated Environment, Shenyang University, Ministry of Education, Shenyang, 110044, China.
出版信息
Environ Geochem Health. 2022 Apr;44(4):1399-1407. doi: 10.1007/s10653-021-01094-8. Epub 2021 Oct 22.
In this paper, we studied the changes of Hg and MeHg contents in Liaohe estuarine Suaeda salsa soils under anaerobic conditions by simulated indoor incubation at constant temperature and whether the changes of salinity (CK, 0.5%, 1.0%, 1.5%, 2.0%) affected SRB and dominated the formation of MeHg. The lowest Hg content is found in the subsurface Suaeda salsa soils at 2.0% salinity. The MeHg content in the soil also showed a general trend of increasing and then decreasing with increasing flooding salinity, and the MeHg content was higher at 0.5-1.0% flooding salinity. SRB was present in the soil under all salinity conditions and reached the maximum value at 15 days of incubation. The SRB content was higher under CK, S1 and S2 conditions, and the soil MeHg content showed a significant positive correlation with the number of SRB bacteria, indicating that the formation of MeHg was related to SRB which is of great significance to the study of estuarine wetlands.
本文通过恒温模拟室内培养研究了辽河口盐地碱蓬土壤在厌氧条件下 Hg 和 MeHg 含量的变化，以及盐度（CK、0.5%、1.0%、1.5%、2.0%）的变化是否影响硫酸盐还原菌（SRB）并主导 MeHg 的形成。在 2.0%盐度下，底层盐地碱蓬土壤中的 Hg 含量最低。土壤中 MeHg 的含量也呈现出随淹水盐度增加先增加后减少的总体趋势，淹水盐度为 0.5-1.0%时 MeHg 含量较高。在所有盐度条件下，土壤中均存在硫酸盐还原菌（SRB），且在培养 15 天时达到最大值。在 CK、S1 和 S2 条件下，SRB 含量较高，土壤中 MeHg 含量与 SRB 细菌数量呈显著正相关，表明 MeHg 的形成与 SRB 有关，这对河口湿地的研究具有重要意义。
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