The oxygen isotope signature of sulphate (δ¹⁸O_sulphate) is increasingly used to study nutritional fluxes and sulphur transformation processes in a variety of natural environments. However, mechanisms controlling the δ¹⁸O_sulphate signature in soil–plant systems are largely unknown. The objective of this study was to determine key factors, which affect δ¹⁸O_sulphate values in soil and plants. The impact of an ¹⁸O‐water isotopic gradient and different types of fertilizers was investigated in a soil incubation study and a radish (Raphanus sativus L.) greenhouse growth experiment. Water provided 31–64% of oxygen atoms in soil sulphate formed via mineralization of organic residues (green and chicken manures) while 49% of oxygen atoms were derived from water during oxidation of elemental sulphur. In contrast, δ¹⁸O_sulphate values of synthetic fertilizer were not affected by soil water. Correlations between soil and plant δ¹⁸O_sulphate values were controlled by water δ¹⁸O values and fertilizer treatments. Additionally, plant δ³⁴S data showed that the sulphate isotopic composition of plants is a function of S assimilation. This study documents the potential of using compound‐specific isotope ratio analysis for investigating and tracing fertilization strategies in agricultural and environmental studies.

中文翻译：

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土壤和植物来源的硫酸盐的氧同位素特征受肥料类型和水源的控制。

硫酸盐中的氧同位素签名（δ ¹⁸ ö_硫酸盐）被越来越多地用于研究营养通量和硫转化过程中的各种天然环境。然而，机制控制δ ¹⁸ Ø_硫酸盐在土壤-植物系统签名在很大程度上是未知。这项研究的目的是确定的关键因素，其影响δ ¹⁸ Ø_硫酸盐在土壤和植物中值。在土壤培养研究和萝卜（Raphanus sativus）中研究了¹⁸ O-水同位素梯度和不同类型肥料的影响L.）温室生长实验。在有机硫酸盐（有机肥和鸡粪）矿化形成的土壤硫酸盐中，水提供了31–64％的氧原子，而49％的氧原子来自于元素硫氧化过程中的水。与此相反，δ ^18个ö_硫酸盐合成肥料的值并没有受到影响土壤水分。土壤和植物之间的相关性δ ^18个ö_硫酸盐值通过控水δ ^18个O值和施肥。此外，植物δ ³⁴S数据表明植物的硫酸盐同位素组成是S同化的函数。这项研究记录了在农业和环境研究中使用化合物特异性同位素比分析研究和追踪施肥策略的潜力。