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量化美国各大湖泊的夏季内部含量

Smitom S Borah¹, Natalie G Nelson², Owen W Duckworth³

¹Department of Civil, Construction, and Environmental Engineering, North Carolina State University, Raleigh, North Carolina 27606, United States.

Environmental science & technology

|May 20, 2025

概括

内部负荷 (IPL) 显著影响淡水质量. 我们的研究模拟了美国5899个湖泊的沉积物中的释放,揭示了农业地区的高水平,并确定了关键的管理需求.

科学领域:

环境科学环境科学
临界技术临界技术
水质管理水质管理

背景情况:

内部负荷 (IPL) 是淡水系统中主要的来源,延迟了水质改善.
估计IPL是具有挑战性的,因为测量和建模的困难,留下许多系统未评估.
(P) 是水生生态系统中驱动环氧化的关键营养物质.

研究的目的:

为估计的夏季无氧沉积物释放率 (SRRs) 开发一个建模框架.
评估IPL在连续美国 (CONUS) 的5899个大湖泊和水库.
确定IPL是营养管理的关键因素的地区.

主要方法:

开发了一个框架,将底层水温和总 (TP) 的随机森林模型与SRR的混合效应回归模型相结合.
在所有模型组件中内置不确定性传播.
分析了来自CONUS地区5899个湖泊和水库 (面积>1.0公里2,混合深度<最大深度) 的数据.

主要成果:

在CONUS湖泊中,夏季平均SRR在1至37mg/m2/day之间.
31%的水体呈现SRR>10 mg/m2/day,这通常与预测的高表面水TP有关,特别是在农业地区.
在干燥的夏季,IPL在26%的流域中超过了外部负荷.

结论:

开发的框架提供了IPL的关键估计,解决了显著的数据差距.
高SRR在农业地区普遍存在,突显了有针对性的流域管理的必要性.
IPL可能是占主导地位的来源,需要在水质改善策略中考虑它.

关键词:

随机森林回归随机森林回归肥胖症是什么肥胖症是什么肥胖症是什么混合型建模混合型建模多层次建模多层次建模营养素营养素营养素不确定性的传播.

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相关概念视频

The Phosphorus Cycle

The Phosphorus Cycle

Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.