College of Resources and Environment, Key Laboratory of Soil Multiscale Interface Process and Control, Southwest University, Chongqing, 400715, China.
Environ Sci Pollut Res Int. 2017 Mar;24(8):7114-7123. doi: 10.1007/s11356-017-8414-x. Epub 2017 Jan 16.
In this study, the effectiveness of controlling the eutrophication using purple parent rock to cap the sediments was evaluated in the laboratory scale. Sediments were collected from Sanxikou reservoir (China) in July 2013. Then, three types of purple parent rock (Tf, Jp, and Js) which are distributed widely in southwest China were used to cap the sediments. Limestone and calcite were used as the contrast group, because they had been reported as effective controls on eutrophication. Then, they were incubated at 20 °C for 46 days. The results indicated that the application of purple parent rock as a barrier material can effectively inhibit the release of nutrient elements in sediments, and the inhibition rates of total nitrogen (TN), total phosphorus (TP), ammonium (NH-N), and nitrate (NO-N) were much better than that of limestone and calcite. Among the three types of purple parent rock, Jp exhibited the best inhibitory effect on the release of nitrogen in sediments, and the inhibition efficiency of TN, NH-N, and NO-N was 59.7, 77.6, and 45.1%, respectively. As for Tf, it exhibited the best inhibitory effect on the release of TP in sediments with the inhibition rate of 94.4%. Whereas all these capping materials showed weak inhibition on release of organic matter in sediments, and the inhibition efficiencies were less than 20%. Moreover, these treatments could also cause distinct changes in the microbial community in sediments and overlying water, and the contents of TN and TP in all capping materials increased. All results demonstrated that purple parent rock could inhibit the release of nutrient in sediments through mechanical interception, physical adsorption, and chemical absorption as well as changing the microbial activity in the covering layer, sediments, or overlying water.
本研究采用紫色母岩对沉积物进行覆盖，评估了控制富营养化的效果。沉积物于 2013 年 7 月从三溪口水库（中国）采集。然后，使用广泛分布在中国西南部的三种紫色母岩（Tf、Jp 和 Js）对沉积物进行覆盖。石灰岩和方解石被用作对照组，因为它们已被报道为有效控制富营养化的物质。然后，将它们在 20°C 下孵育 46 天。结果表明，将紫色母岩作为阻隔材料应用于沉积物中，可以有效地抑制营养元素的释放，总氮（TN）、总磷（TP）、氨氮（NH-N）和硝酸盐（NO-N）的抑制率明显优于石灰岩和方解石。在三种紫色母岩中，Jp 对沉积物中氮释放的抑制效果最好，TN、NH-N 和 NO-N 的抑制效率分别为 59.7%、77.6%和 45.1%。而对于 Tf，它对沉积物中 TP 的释放具有最佳的抑制效果，抑制率达到 94.4%。然而，所有这些覆盖材料对沉积物中有机物的释放抑制作用较弱，抑制效率均小于 20%。此外，这些处理还会导致沉积物和上覆水中微生物群落的明显变化，所有覆盖材料中的 TN 和 TP 含量均增加。所有结果表明，紫色母岩可以通过机械拦截、物理吸附和化学吸收以及改变覆盖层、沉积物或上覆水中的微生物活性来抑制沉积物中营养物质的释放。
