Influence of flooding, salinity and inundation time on the bioavailability of metals in wetlands.
Influence of flooding, salinity and inundation time on the bioavailability of metals in wetlands.
复制标题
DOI：
10.1016/j.scitotenv.2006.07.041
复制
发表时间：
2007-07
期刊：
影响因子：
--
通讯作者：
M. Speelmans;D. Vanthuyne;K. Lock;F. Hendrickx;L. G. Du;F. Tack;Colin R. Janssen
中科院分区：
文献类型：
--
作者：
M. Speelmans;D. Vanthuyne;K. Lock;F. Hendrickx;L. G. Du;F. Tack;Colin R. Janssen
控制低地洪水被认为是一种潜在的水管理策略，可最大限度地减少高水位期间居住区洪水的风险。然而，由于工业活动，河水、沉积物和土壤经常受到金属污染，这可能对生态系统的结构和功能产生不利影响。此外，盐度可能会极大地影响存在或输入到这些系统中的金属的生物利用度和毒性。研究了不同洪水和盐度暴露情况下污染土壤对寡毛类 Tubifex tubeifex 生长、繁殖和金属积累的影响（Müller，1774）。在这些生物测定中，金属污染的土壤被不同盐度（0 和 3 psu）的水淹没，并在永久淹没 0、6 和 12 个月后进行测试。我们确实发现淹没时间对铜和锌的积累有显着的降低作用；尽管在洪水处理开始时，先前未淹没的土壤中铜和锌的初始积累量较高，但这些差异在 6 个月的永久淹没后似乎消失了。此外，底物类型和盐度之间复杂的相互作用表明氧化还原电位可能非常重要。
Controlled flooding of lowlands is considered as a potential water management strategy to minimize the risk of flooding of inhabited areas during high water periods. However, due to industrial activities, river water, sediments and soils are often contaminated with metals which may have adverse effects on the ecosystem's structure and functioning. Additionally, salinity may greatly affect the bioavailability and toxicity of metals present or imported into these systems. The effect of contaminated soils under different flooding and salinity exposure scenarios on the growth, reproduction and metal accumulation in the oligochaete Tubifex tubifex (Müller, 1774) were examined. In these bioassays metal contaminated soils were flooded with water of different salinities (0 and 3 psu), and tested after 0, 6 and 12 months of permanent inundation. We indeed found that inundation time had significant decreasing effects on Cu and Zn accumulation; although initial accumulation of Cu and Zn was higher in the previously unflooded soil at the start of the flooding treatment, these differences seem to disappear after 6 months of permanent inundation. Moreover, the complex interaction between substrate type and salinity suggests that redox potential is probably of major importance.