来自点和扩散来源的营养素和有机化合物驱动了亚热带河口水中的氧气需求
Jing Lu1, Michael Newham2, Ann Chuang1
1Australian Rivers Institute, Logan Campus, Griffith University, 68 University Dr, Meadowbrook, Queensland, 4131, Australia.
Journal of environmental management
|June 26, 2025
概括
对比水质交易的营养来源需要评估溶解的氧气需求. 土壤侵蚀,污水处理和水产养殖污水对氧气水平的影响不同,需要采取整体方法来有效管理生态系统.
科学领域:
- 环境科学 环境科学
- 生态系统健康 生态系统健康
- 水质管理水质管理
背景情况:
- 在点和分散源之间进行水质交易对于水生生态系统的健康至关重要.
- 需要使用定量方法来比较不同污染源对生态系统的影响.
- 溶解氧 (DO) 需求是水生环境生态系统健康的关键指标.
研究的目的:
- 识别和比较影响不同来源的DO需求的营养素和有机碳参数.
- 量化评估模拟的土壤侵蚀排水,污水处理厂 (STP) 废水和水产养殖废水对生态系统的影响.
- 为水质交易提供公平的环境影响评估信息.
主要方法:
- 化实验测量在河口水中的DO需求,暴露在三个模拟来源中.
- 在土壤泥,STP废水和水产养殖废水中的有机化合物的化学表征.
- 统计分析以将营养素和有机碳参数与DO需求相关联.
主要成果:
- 溶解有机碳 (DOC) 度是对土壤泥的DO需求的主要驱动因素 (R2 = 0.52).
- 对于STPs,总 (TN),和特定比率的组合解释了DO需求 (R2 = 0.5).
- 甲和DOC:总溶解比率最好解释了水产养殖的DO需求 (R2 = 0.80).
- 土壤泥含有更多可生物利用的有机化合物 (例如葡萄糖,脂肪酸),而不是STP (有机酸) 和水产养殖 (脂性化合物).
- DOC生物活性与C:N和N:P比率相关,表明微生物营养素受限.
结论:
- 公平的水质交易需要考虑来自不同来源的有机碳和营养素参数.
- 接收河口水环境的营养特征对于评估贸易影响至关重要.
- 不同的来源表现出不同的有机物特性,影响它们对溶解氧水平的影响.
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