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Updated: Jul 3, 2025

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在过冬的建造浮动湿地中的吸收和释放模式

Jack Dekle¹, William H J Strosnider², Sarah A White³

¹Environmental Toxicology Graduate Program, 509 Westinghouse Rd., Clemson University, Pendleton, South Carolina 29670, USA

Water science and technology : a journal of the International Association on Water Pollution Research

|February 15, 2024

概括

使用Juncus effusus建造的浮动湿地 (CFW) 可以全年减少 (P) 负载. 这项研究表明,J. effusus在春季再生期间有效地去除P,并在秋季衰老期间修复P,与Pontederia cordata不同.

科学领域:

环境科学环境科学
水生生态学水生生态学
营养素循环循环的过程

背景情况:

建造的浮动湿地 (CFW) 越来越多地用于改善水质.
了解CFW中的营养动态,特别是 (P),对于优化CFW的设计和管理至关重要.
植物衰老和再生显著影响水生生态系统内的营养循环.

研究的目的:

评估CFW中的植物在秋冬衰老和春季再生期间的 (P) 吸收和释放模式.
为了比较两个植物物种Pontederia cordata和Juncus effusus在CFW中的P循环性能.
评估使用CFWs全年P负载减轻的潜力.

主要方法:

为了量化P动态,进行了两个中宇宙规模的CFW实验.
实验1侧重于春季再生期间的P吸收,而实验2侧重于秋季衰老期间的P释放.
植物生长,植物组织P水平和水质参数 (营养素,浮游生物) 被监测到CFW处理和开放水域控制.

主要成果:

在春季,Juncus effusus表现出最高的P去除率 (0.056 g P m^-2 d^-1,负载的19.4%),其次是Pontederia cordata (0.034 g P m^-2 d^-1,10%).
在秋季衰老期间,J. effusus固定了P (0.008 g P m-2 d-1 ,2.1%),而P. cordata释放了P (0.014 g P m-2 d-1 ,-2.1%).
在秋季从衰老的植物组织中持续释放,偶尔在春季从根部脱落中释放.

结论:

在建造的浮动湿地中,Juncus effusus具有显著的潜力,可以全年减少负荷.
必须考虑季节性营养循环模式,包括在衰老期间的P释放,以有效管理CFW.
多季度部署CFW,特别是J. effusus,可以加强整体水质改善工作.

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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.

Primary Production

Primary Production

The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.

Responses to Drought and Flooding

Responses to Drought and Flooding

Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.