Phosphate oxygen isotopes in lake sediments: stability and application for assessing palaeo nutrient dynamics

IF 4.3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Biogeochemistry Pub Date : 2026-04-07 Epub Date: 2026-08-10 DOI:10.1007/s10533-026-01324-0

Christopher Bengt, Savannah Worne, Peter Wynn, Ana Prohaska, Tim Sexton, Andrew C. Smith

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引用次数: 0

Abstract

The oxygen isotope composition of phosphate (δ¹⁸O-PO₄) has been successfully used to study modern biological cycling of phosphorus (P) from the upper few centimetres of lake sediments. However, there is a lack of knowledge regarding the stability and preservation of δ¹⁸O-PO₄ over longer time scales in deeper lake sediments. Three sediment cores were collected from a nutrient-rich lagoon at Rutland Water Nature Reserve to explore P dynamics under controlled conditions, including a baseline (untreated) core and cores stored with oxygen-enriched water at 4 to 7 °C for six months. Results of the baseline core suggests that P in the sediment has undergone biological turnover. Additionally, results of the two treated cores using δ¹⁸O-PO₄ from HCl extractable inorganic P pool remained stable, even under altered water oxygen isotope conditions. These finding offer proof of concept for using δ¹⁸O-PO₄ as a tracer of past nutrient inputs and cycling with a range of potential applications in the area of past ecosystem reconstruction.

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湖泊沉积物中的磷氧同位素：稳定性及其在评估古营养动力学中的应用。

磷酸盐的氧同位素组成（δ18O-PO4）已成功地用于研究湖泊沉积物中磷(P)的现代生物循环。然而，在较深的湖泊沉积物中，δ18O-PO4在较长时间尺度上的稳定性和保存尚缺乏认识。研究人员从拉特兰水域自然保护区（Rutland Water Nature Reserve）一个营养丰富的泻湖中收集了三个沉积物岩心，在受控条件下探索磷的动态变化，包括基线（未经处理）岩心和在4至7°C富氧水中储存6个月的岩心。基线岩心的结果表明，沉积物中的磷发生了生物转换。此外，即使在改变了水氧同位素的条件下，使用HCl可萃取无机P池中的δ18O-PO4处理的两个岩心的结果也保持稳定。这些发现为δ18O-PO4作为过去养分输入和循环的示踪剂在过去生态系统重建领域的一系列潜在应用提供了概念证明。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Biogeochemistry 环境科学-地球科学综合

CiteScore

7.10

自引率

5.00%

发文量

112

审稿时长

3.2 months

期刊介绍： Biogeochemistry publishes original and synthetic papers dealing with biotic controls on the chemistry of the environment, or with the geochemical control of the structure and function of ecosystems. Cycles are considered, either of individual elements or of specific classes of natural or anthropogenic compounds in ecosystems. Particular emphasis is given to coupled interactions of element cycles. The journal spans from the molecular to global scales to elucidate the mechanisms driving patterns in biogeochemical cycles through space and time. Studies on both natural and artificial ecosystems are published when they contribute to a general understanding of biogeochemistry.