Abstract：
Mercury (Hg) is a chemical element that, depending on its concentration, may become toxic to living organisms due to the ability of Hg to bioaccumulate in food chains. In this study, we collected samples of soil, litter, and organisms in the Middle Araguaia floodplain, Brazil. Total mercury (THg) concentrations in litter were significantly higher (p < 0.0001) than that in soil, ranging from 10.68 ± 0.55 to 48.94 ± 0.13 and 20.80 ± 1.07 to 55 .19 ± 1.59 ng g-1, respectively. Total mercury concentration levels in soil showed a linear, inversely proportional relationship with soil organic matter (SOM) contents and soil pH, consistent with the geochemical behavior of chemical elements in flooded environments. Ten orders of organisms were identified, and the average THg concentrations determined in their bodies were up to 20 times higher than those in soil and litter. We found a significant linear relationship between the levels of THg in litter and those found in soil organisms, thereby allowing the prediction of THg concentration levels in soil organisms through the analysis of litter at the sample units. The different dynamics and feeding habits of soil organisms and the concentration of THg in these organisms may be influenced by the river\'s course. This study provides evidence of the bioaccumulation of THg in soil organisms in the floodplain of the Middle Araguaia River, an important river basin in the Brazilian savanna.
摘要：
汞(Hg)是一种化学元素,取决于它的浓度，由于汞在食物链中的生物积累能力，可能对生物体有毒。在这项研究中,我们采集了土壤样本,垃圾,和中部阿拉瓜亚洪泛区的生物，巴西。凋落物中总汞(THg)浓度显著高于土壤(p<0.0001),范围分别为10.68±0.55至48.94±0.13和20.80±1.07至55.19±1.59ngg-1。土壤中的总汞浓度水平呈线性，与土壤有机质（SOM）含量和土壤pH成反比关系，与洪水环境中化学元素的地球化学行为一致。确定了十种生物，在他们体内确定的平均THg浓度是土壤和凋落物中的20倍。我们发现凋落物中的THg水平与土壤生物中的THg水平之间存在显着的线性关系，从而允许通过分析样品单位的凋落物来预测土壤生物中THg的浓度水平。土壤生物的不同动态和摄食习性以及这些生物中THg的浓度可能受河道的影响。这项研究提供了THg在阿拉瓜河中部洪泛区的土壤生物中的生物积累的证据，巴西稀树草原的一个重要流域。
