Savannah River Ecology Laboratory, University of Georgia, Aiken, South Carolina, United States of America.
PLoS One. 2021 Aug 3;16(8):e0255527. doi: 10.1371/journal.pone.0255527. eCollection 2021.
The objective of this study was to explore the effects of time, seasons, and total carbon (TC) on Copper (Cu) and Zinc (Zn) deposition in the surface sediments. This study was performed at the H-02 constructed wetland on the Savannah River Site (Aiken, SC, USA). Covering both warm (April-September) and cool (October-March) seasons, several sediment cores were collected twice a year from the H-02 constructed wetland cells from 2007 to 2013. Total concentrations of Cu and Zn were measured in the sediments. Concentrations of Cu and Zn (mean ± standard deviation) in the surface sediments over 7 years of operation increased from 6.0 ± 2.8 and 14.6 ± 4.5 mg kg-1 to 139.6 ± 87.7 and 279.3 ± 202.9 mg kg-1 dry weight, respectively. The linear regression model explained the behavior and the variability of Cu deposition in the sediments. On the other hand, using the generalized least squares extension with the linear regression model allowed for unequal variance and thus produced a model that explained the variance properly, and as a result, was more successful in explaining the pattern of Zn deposition. Total carbon significantly affected both Cu (p = 0.047) and Zn (p < 0.001). Time effect on Cu deposition was statistically significant (p = 0.013), whereas Zn was significantly affected by the season (p = 0.009).
本研究旨在探讨时间、季节和总碳（TC）对表层沉积物中铜（Cu）和锌（Zn）沉积的影响。该研究在萨凡纳河场址的 H-02 人工湿地进行（美国南卡罗来纳州艾肯）。本研究涵盖了温暖季节（4 月至 9 月）和凉爽季节（10 月至 3 月），于 2007 年至 2013 年期间，每年两次从 H-02 人工湿地池中采集了多个沉积物岩芯。对沉积物中的 Cu 和 Zn 总浓度进行了测量。在 7 年的运行过程中，表层沉积物中 Cu 和 Zn 的浓度（平均值±标准差）从 6.0±2.8 和 14.6±4.5mg kg-1增加到 139.6±87.7 和 279.3±202.9mg kg-1干重。线性回归模型解释了 Cu 在沉积物中的沉积行为和变异性。另一方面，使用带有线性回归模型的广义最小二乘扩展允许不等方差，从而产生了一个能够正确解释方差的模型，因此更成功地解释了 Zn 沉积的模式。总碳对 Cu（p=0.047）和 Zn（p<0.001）都有显著影响。Cu 沉积的时间效应具有统计学意义（p=0.013），而 Zn 则受到季节的显著影响（p=0.009）。
