雨水和土地利用对淡水系统中溶解和颗粒的生物地质化学转化的影响
Sangar Khan1, Yuting Wang1, Paul J Milham2
1Department of Geography and Spatial Information Techniques, Ningbo University, Ningbo 315211, China.
Water research
|June 24, 2025
概括
雨水排水显著改变了淡水中的 (P) 形式. 风暴期间高悬浮颗粒物会去除溶解的P,影响淡水的P控制.
科学领域:
- 环境化学环境化学
- 淡水生态学 淡水生态
- 生物地质化学生物地质化学
背景情况:
- 气候变化加剧风暴事件,增加污染物流入淡水系统.
- 了解风暴期间 (P) 转化对于管理淡水质量至关重要.
- P存在于溶解和颗粒形式,每一种都有不同的环境行为.
研究的目的:
- 在暴风雨和干旱天气条件下调查各种 (P) 物种的生物地化学转化.
- 为了确定悬浮颗粒物 (SPM) 和pH对淡水中P分化的影响.
- 评估土地利用对雨水事件期间P动态的影响.
主要方法:
- 在暴风雨和干旱天气期间收集的地表水样本流动在pH梯度上.
- 测量了溶解的无机P (DIP),溶解的有机P (DOP),体P (COP,CIP) 和颗粒P (POP,PIP).
- 分析了悬浮颗粒物 (SPM) 的度,并与P分区系数 (Kd) 和基叶绿素-a相关联.
主要成果:
- 干燥天气流量显示由于低SPM和脱吸,溶解无机P (DIP) 的增加.
- 雨水流导致DIP通过吸附到高度的SPM去除.
- 在P分区系数 (Kd) 和SPM/pH之间观察到负相关性,表明P吸附到沉积物上.
- 基叶绿素-a,DIP和颗粒无机P (PIP) 的相关性表明P吸收影响地化学转变.
结论:
- 雨水流量在溶解和颗粒物相之间显著转移P.
- 与森林地区相比,城市和农业用地对支流和主流的P动态的影响更大.
- 雨水管理和土地利用实践对于控制淡水P水平至关重要.
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