在受到大规模蔬菜生产影响的高气候热带土壤中的物种化
Matheus Sampaio C Barreto1, Evert J Elzinga2, Ashaki A Rouff2
1Department of Plant & Soil Sciences, University of Delaware, Newark, DE 19716, USA; Department of Soil Science, Luiz de Queiroz College of Agriculture, University of São Paulo, Piracicaba, SP, Brazil; Department of Earth & Environmental Sciences, Rutgers University, Newark, NJ, USA.
The Science of the total environment
|January 24, 2024
概括
热带土壤的长期施肥改变了的物种化,增加了它与酸盐的关联,减少了其流动性. 这会影响农业系统中营养素的可用性.
科学领域:
- 土壤科学 土壤科学
- 环境化学环境化学
- 农业科学 农业科学
背景情况:
- 热带土壤需要大量的石灰和肥料用于农业.
- 这些修正案对土壤化学和微量元素的长期影响尚不清楚.
- 施肥可以改变微量营养素和潜在有毒的微量元素动态.
研究的目的:
- 为了评估热带土壤中的 (Zn) 吸附和物种化.
- 研究受精和土地利用 (农业与本土植被) 对的影响.
- 了解随着时间的推移,Zn与土壤成分的相互作用.
主要方法:
- 使用化学分离分析来确定 Zn 的分布.
- 射线吸收光谱 (XAS) 提供了对Zn物种的洞察力.
- 在pH 5下研究了吸附和物种化,接触时间不同.
主要成果:
- 土壤表现出高的 Zn 吸附能力 (约. 700毫克每公斤−1).
- 农业土壤的吸量比本地植被土壤高30%.
- 与本土土土壤相比,农业土壤 (21%) 的流动性下降了 (35%).
- 在受肥土壤中,的物种化从有机物质的关联转向了酸盐的关联.
- 酸矿物质是关键的 Zn 沉 (34%的保留率).
- 在农业土壤中发现了一种 Zn-酸盐矿物 Hopeite.
结论:
- 施肥显著改变了Zn的物种化,并减少了它在热带土壤中的流动性.
- 在这些系统中,酸盐矿物质的形成,如hopeite,是值得注意的发现.
- 了解这些变化对于管理热带农业中的营养和潜在的毒性至关重要.
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