温度和土壤污染影响了被洪水淹没的射击场土壤中的溶解和合释放
Ursina Morgenthaler1, Stephanie Pfister1, Isabelle Worms2
1Institute of Geography and Oeschger Center for Climate Change Research, University of Bern, Hallerstrasse 12, Bern CH-3012, Switzerland.
土壤中的 (Sb) 流动性受温度和微生物活动的影响. 高温降低了微生物生物量较高的土壤中的Sb释放,但增加了微生物生物量较低的土壤中的Sb释放.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 土壤科学 土壤科学
背景情况:
- 土壤中的反 (Sb) 流动性是一个日益严重的环境问题,但其在不断变化的气候条件下的行为尚不清楚.
- 射击场是土壤被反和 (Pb) 污染的潜在来源.
- 微生物生物质显著影响影响污染物流动性的地化学过程.
研究的目的:
- 为了研究温度对 (Sb) 从受污染的土壤在洪水条件下释放的影响.
- 评估土壤微生物生物质在Sb释放和流动性中介作用.
- 为了描述土壤孔水中的的合体分数.
主要方法:
- 一个为期28天的微观宇宙实验,使用两个射击场土壤,具有不同的Sb,Pb和微生物生物质水平.
- 连续提取和孔水分析以量化Sb在20°C和25°C的释放.
- 不对称的流场流量分成 (AF4) 来确定Sb大小分布和表征体Sb.
主要成果:
- 高温降低了微生物生物质较高的污染较小的土壤中的Sb释放,但在微生物生物质较低的高度污染的土壤中的释放增加.
- 微生物生物质在调解温度依赖的Sb释放中发挥了关键作用,可能是通过氧化还原转换.
- 孔水中Sb的很大一部分 (13-36%) 是以合物形式存在的,AF4识别了有机/微晶和矿物纳米粒子群.
结论:
- 土壤微生物生物质是控制反氧化还原转化和在不同温度条件下释放的关键因素.
- 体运输是土壤中抗氧化物流动性的重要途径.
- 了解这些过程对于评估与反污染相关的环境风险至关重要,尤其是在未来气候情景下.
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