海水淹没石灰质土壤:对微量和金属流动性的影响
Niguss Solomon Hailegnaw1, Haimanote K Bayabil1, Yuncong C Li2
1Department of Agricultural and Biological Engineering, Tropical Research and Education Center, IFAS, University of Florida, Homestead, FL 33031, USA.
The Science of the total environment
|April 7, 2024
概括
海水洪水在石灰质土壤中显著释放 (Mn),铁 (Fe) 和 (Zn) 等微量金属,随着时间和深度的增加而增加. 这带来了植物毒性和水污染的风险.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 地质化学 地质化学
背景情况:
- 有效的公共卫生和环境可持续性管理策略需要了解海水淹没期间土壤中的金属流动性.
- 沿海地区的石灰质土壤特别容易受到海水的入,影响金属的溶解性和释放.
研究的目的:
- 研究海水洪水持续时间对克罗姆和比斯凯尼土壤中微量和性金属 (Mn,Fe,Cu,Zn,Ca,K,Mg) 的释放的影响.
- 为了比较海水和淡水洪水之间的金属释放模式,在不同的土壤深度和洪水持续时间之间进行.
主要方法:
- 控制的实验室实验模拟了克罗姆和比斯凯恩土壤上的海水和淡水洪水,分别为1,7,14和28天.
- 在15,30和45厘米深度采集的土壤样本分析Mn,Fe,Cu,Zn,Ca,K和Mg度.
主要成果:
- 与淡水相比,海水洪水在两种土壤中都导致了大量的Mn,Fe和Zn的释放,从第一天开始明显增加,随着洪水持续时间的增加而升级.
- 克罗姆土壤在海水淹没28天后,与比斯凯恩土壤相比,Mn,Fe和Zn的百分比增加更高.
- 金属释放受土壤类型,洪水持续时间和土壤深度的影响,高峰度通常在28天和更深层土壤中观察到.
结论:
- 海水泛滥大大增加了石灰质土壤中Mn,Fe和Zn的释放,克罗姆土壤表现出更大的敏感性.
- 洪水的持续时间和土壤深度是影响金属流动性的关键因素,更长的暴露时间和更深层显示出更高的度.
- 这些金属的释放引起了人们对潜在的植物毒性和地下水和地表水因浸和下水而受到污染的重大担忧.
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