在新西兰的降雨事件之后,从关键来源区域释放的氧化诱导的释放
Janani Palihakkara1, Lucy Burkitt2, Paramsothy Jeyakumar2
1Environmental Sciences Group, School of Agriculture and Environment, Massey University, Palmerston North, 4442, New Zealand; Department of Soil Science, Faculty of Agriculture, University of Peradeniya, Peradeniya, 20400, Sri Lanka.
Journal of environmental management
|January 7, 2025
概括
关键源区 (CSAs) 在降雨期间释放出大量 (P),危及淡水缩. 管理策略至关重要,以减轻从淹没的土壤中溶解的P径流.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 水质管理水质管理
背景情况:
- 关键源区 (CSAs) 被认为是导致 (P) 在降雨事件期间通过下水流失的重要因素.
- 溶解P对淡水体构成重大风险,由于其生物可用性,促进了缩.
- 之前关于新西兰在间歇性降雨期间CSAs释放P的现场规模研究缺乏.
研究的目的:
- 调查两种牧场土壤CSA (近期和帕利克) 在间歇性降雨事件期间释放土壤P的潜力.
- 在现场条件下探索驱动这些土壤中P释放的机制.
- 根据淡水质量指南,评估孔水和洪水中的溶解P度.
主要方法:
- 在两个不同的牧场CSA中,对五个冬季降雨事件的实地研究.
- 在2厘米和10厘米深处安装孔水采样器和电极.
- 测量氧化还原潜力,溶解反应 (DRP),pH值,溶解有机碳和主要离子.
- 对土壤P分量的分析和用于矿物溶解的热力学建模的应用.
主要成果:
- 孔水中平均DPR度在0.32-1.3毫克L-1 (新土壤) 和0.26-2.31毫克L-1 (帕里克土壤) 之间.
- 洪水水的DRP度是Manawatū河的目标的35-43倍.
- 的损失主要是由于铁和的氧化和氧化的还原性溶解导致的.
结论:
- 牧场CSA带来了大量的溶解P流失到地表水的风险,特别是当它们被淹没时.
- 减少溶解Fe和Mn氧氧氧化物是P释放的关键机制.
- 针对高风险CSA的有针对性的管理对于减轻P流量和保护淡水生态系统至关重要.
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