土壤中的有机质量和数量与有机物质组成有关,并由土地使用驱动
Maja B Siegenthaler1,2,3, Lenny H E Winkel1,2, Reto G Meuli3
1Eawag, Swiss Federal Institute of Aquatic Science and Technology, Department of Water Resources and Drinking Water (W+T), Überlandstrasse 133, Dübendorf 8600, Switzerland.
Environmental science & technology
|March 4, 2026
概括
土壤有机物组成和土地利用显著影响 (Se) 种类和植物的可用性. 了解这些关系对于管理作物中的Se水平和确保安全的植物性营养至关重要.
科学领域:
- 环境化学环境化学
- 土壤科学 土壤科学
- 生物地质化学生物地质化学
背景情况:
- (Se) 是一种必不可少的微量营养素,缺乏和毒性之间的窗口很窄.
- 土壤物种化极大地影响了土壤的移动性和植物的吸收,影响了人类的营养.
- 了解Se-有机物相互作用是管理Se在农业和自然生态系统的关键.
研究的目的:
- 调查土壤有机物 (OM) 分子组成对不同瑞士表层土壤中的 (Se) 变异的影响.
- 为了确定土地使用 (耕地,草地,森林) 如何影响与OM特征相关的分类.
- 阐明Se形式,OM分解状态,土壤pH值和Se提取能力之间的联系.
主要方法:
- 使用热解气色谱法/质谱法 (Py-GC/MS) 进行土壤OM分子组成的表征.
- 通过尺寸排除色谱与紫外线和元素质谱相结合 (SEC-UV-ICP-MS/MS) 来确定NaOH提取物中的Se分化.
- 分析了92个瑞士表层土壤,代表了各种土地用途.
主要成果:
- 根据OM分解状况,土壤pH值和土地使用情况,分类有很大差异.
- 耕地土壤中含有较高比例的Seoxyanions和小型水友性有机Se.
- 森林和草原土壤含有较大,芳香的有机Se化合物与较少分解的OM有关,而Se氧离子与分解的OM有关.
结论:
- 土壤土地使用和OM分解状态是种类变化的主要驱动因素.
- 土地利用的变化和土壤有机物 (SOM) 的降解可能会改变Se植物的可用性.
- 这些发现对于管理农业系统中的Se和减轻与土地利用变化相关的风险至关重要.
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