利用磷氧同位素比值追踪火灾引起的土壤磷转化

IF 4 2区 农林科学 Q2 SOIL SCIENCE
Takuya Ishida, Isao Hirota, Satoshi Yokoyama
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引用次数: 0

摘要

本研究证明,磷氧同位素(δ18OPO4)分析可有效检测和监测火灾引起的土壤磷(P)转化。火灾会增加生物可利用的磷,从而可能限制陆地生态系统的初级生产。然而,由于火灾蔓延与具有高度空间异质性的土壤特性之间的相互作用,了解火灾对实地土壤磷动态的影响仍然具有挑战性。我们利用在日本中部采集的地表土壤样本进行了土壤燃烧实验。土壤在 50 至 550°C 的电炉中燃烧了 3 小时,并测定了 P 浓度和 δ18OPO4 值。结果表明,高温(350°C)消耗了土壤中的有机钾(Po),增加了易变和稳定的无机钾(Pi)浓度,同时显著降低了δ18OPO4 值。与此相反,低温(150°C)增加了可溶性 Pi 和 Po 的浓度,但没有发生同位素偏移,这表明低强度火灾可以在保护土壤有机质的同时增加生物可利用的 P。这些研究结果表明,δ18OPO4 分析可以让人们深入了解钾转化与火灾强度之间的关系,并跟踪钾动态随时间的后续变化。我们的研究强调了 δ18OPO4 在预测和管理火灾后对生态和农业影响方面的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Tracing of fire-induced soil phosphorus transformations using phosphate oxygen isotope ratio

Tracing of fire-induced soil phosphorus transformations using phosphate oxygen isotope ratio

This study demonstrates that phosphate oxygen isotope (δ18OPO4) analysis effectively detects and monitors fire-induced transformation in soil phosphorus (P). Fires increase bioavailable P, potentially limiting primary production in terrestrial ecosystems. However, understanding the effects of fire on soil P dynamics in the field remains challenging due to the interaction between fire spread and soil properties with high spatial heterogeneity. Soil burning experiments were conducted using a surface soil sample collected in central Japan. The soil was burned in an electric furnace from 50 to 550°C for 3 h, and P concentrations and δ18OPO4 values were determined. The results revealed that high temperatures (>350°C) depleted the soil of organic P (Po) and increased labile and stable inorganic P (Pi) concentrations while significantly decreasing δ18OPO4 values. By contrast, low temperatures (150°C) increased labile Pi and Po concentrations without isotopic shift, indicating that low-intensity fires could increase bioavailable P while conserving soil organic matter. These findings indicate that δ18OPO4 analysis can provide insight into the relationship between P transformations and fire intensity and track subsequent changes in P dynamics over time. Our research highlights the potential of δ18OPO4 in predicting and managing postfire ecological and agricultural impacts.

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来源期刊
European Journal of Soil Science
European Journal of Soil Science 农林科学-土壤科学
CiteScore
8.20
自引率
4.80%
发文量
117
审稿时长
5 months
期刊介绍: The EJSS is an international journal that publishes outstanding papers in soil science that advance the theoretical and mechanistic understanding of physical, chemical and biological processes and their interactions in soils acting from molecular to continental scales in natural and managed environments.
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