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Updated: Jun 1, 2025

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment

Published on: July 22, 2019

使用酸氧同位素识别农业排水和浸出物中的溶解反应来源

Rose C K Mumbi¹, Mark R Williams², William I Ford³

¹USDA ARS, National Soil Erosion Research Laboratory, West Lafayette, IN 47907, United States of America; Purdue University, Department of Agronomy, West Lafayette, IN 47907, United States of America.

Journal of contaminant hydrology

|January 17, 2025

概括

追踪农业 (P) 损失对于淡水保护至关重要. 氧-18签名 (δ18OPO4) 有效地识别了最近应用的肥料作为应用后立即P损失的主要来源.

科学领域:

环境科学环境科学
农业科学农业科学
同位素地球化学同位素地球化学

背景情况:

来自肥料和土壤的农业 (P) 损失有助于淡水污染.
区分P源对于有效的管理实践来减少环境风险至关重要.
了解P流失的来源对于有针对性的减缓策略至关重要.

研究的目的:

量化新 (肥料) 与旧 (土壤) 在农业排水和液中的损失.
为了评估酸盐 (δ18OPO4) 的氧-18签名作为P来源的标记物的实用性.
评估施肥时间对P损失动态的影响.

主要方法:

在施肥前和施肥后,在土壤柱上进行了实验室降雨模拟.
酸盐 (δ18OPO4) 在肥料,土壤,排水和液中的氧-18签名的分析.
归因于直接肥料P损失的溶解反应性P (DRP) 负载的量化.

主要成果:

溶解反应性P (DRP) 度在排水和液中显著增加,在施加肥料后立即显著增加.
排水和液中的 δ18OPO4 标记与肥料标记密切匹配,表明>90%的肥料直接P损失.
随后的降雨事件显示DRP降低和不同的液 δ18OPO4签名,使源归因复杂化.

结论:

酸盐 (δ18OPO4) 的氧-18特征是一个有前途的工具,可以在短期内追踪直接的肥料P损失.
由于潜在的非生物和生物P循环影响,解释同位素签名在后来的事件中变得具有挑战性.
虽然对于应用后的直接损失有效,但在使用 δ18OPO4 来追踪 P 源在较长时间内仍然存在挑战.

关键词:

溶解的反应性.的循环循环活动稳定的同位素是稳定的.追踪器是一种追踪器.水的质量水的质量

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