Results 21 to 30 of about 1,231,178 (148)

Altered nutrient cycling functionality in seagrass meadows under a simulated future marine heatwave event

open access: yesNew Phytologist, Volume 247, Issue 6, Page 2616-2629, September 2025.
Summary Seagrasses are important contributors to environmental nutrient cycling in marine ecosystems and can improve water quality by absorbing excess nitrogen (N). However, these ecosystems are vulnerable to human‐mediated pressures, including marine heatwaves (MHWs), particularly those of longer duration. We performed an experiment simulating a 30‐d,
Alissa V. Bass   +5 more
wiley   +1 more source

短程反硝化的微生物富集策略及应用研究进展

open access: yesGongye shui chuli, 2023
污废水的高效节能脱氮技术一直以来都是研究和应用的焦点。短程反硝化-厌氧氨氧化耦合工艺因具有能耗低、产泥少、温室气体减排和脱氮效果好等优点,已成为废水脱氮领域研究和应用的热点。其中,短程反硝化被认为是厌氧氨氧化菌获取底物(NO2--N)的重要途径之一,对其进行研究具有重要的科学和工程意义。基于此,综述了短程反硝化的工艺原理,总结了硫自养短程反硝化和异养短程反硝化微生物的富集方法,并探讨了短程反硝化-厌氧氨氧化耦合工艺处理城市污水、高浓度氨氮废水和硝酸盐废水的工程应用 ...
李芸, 熊星星, 崔楠, 黄志远
doaj  

Arbuscular mycorrhizal fungus reshapes the rhizosphere microbiome of alfalfa in response to above‐ground attack by aphids and a fungal plant pathogen

open access: yesFunctional Ecology, Volume 39, Issue 8, Page 2149-2169, August 2025.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Plants assemble beneficial rhizosphere microbiomes through a ‘cry for help’ mechanism upon pathogen or insect herbivore attack. The arbuscular mycorrhizal fungi (AMF) can influence the composition of microbial communities in the plant rhizosphere. However, their impacts
Yingde Li   +6 more
wiley   +1 more source

Plant–microbe interactions drive the rhizosphere microbial assembly and nitrogen cycling in a subtropical forest

open access: yesFunctional Ecology, Volume 39, Issue 5, Page 1274-1287, May 2025.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Interactions between plants and soil microorganisms in the rhizosphere are vital for maintaining the nutrient cycle and stability of terrestrial ecosystems. Nitrogen, closely related to carbon (C) cycling and ecosystem productivity, undergoes transformation by soil ...
Ru Wang   +9 more
wiley   +1 more source

Guanotrophy: Waterbirds Pay for Using Resources at Their Wintering Habitats 鸟粪营养学 :水鸟在越冬栖息地使用资源后留下回报

open access: yesIntegrative Conservation, Volume 3, Issue 4, Page 382-397, December 2024.
Significant waterbird colonisation was recorded in the wintering period (October through March in 2018–2019 and 2019–2020) in wetlands on Central Asian and East Australasian Flyways. Different limnochemical conditions influenced nitrate and phosphate concentrations.
Arkajyoti Mukherjee   +3 more
wiley   +1 more source

无机盐对生物硝化功能的影响

open access: yesGongye shui chuli, 2014
为确定不同的无机盐对硝化菌群的抑制作用,采用批量实验研究了氯化钠、硫酸钠和氯化钙3种无机盐在不同浓度下的生物硝化过程.研究结果表明:3种无机盐质量浓度均为10 g/L时,硫酸钠对硝化菌群的抑制作用最小,氯化钠对硝化菌群的抑制作用最大.3种无机盐质量浓度均为20 g/L时,硫酸钠对硝化菌群的抑制作用最小,氯化钙对硝化菌群的抑制作用最大.无机盐对硝化菌群的抑制作用除了与渗透压有关以外,还与处理系统pH有关.
李玲玲, 李文倩, 江红波
doaj   +2 more sources

呼吸图谱法评估活性污泥反硝化性能

open access: yesGongye shui chuli, 2020
呼吸图谱法已广泛应用于活性污泥系统生物特性的评估。采用批次静态试验方法,研究了污泥絮体类型、MLSS和厌氧适应期对反硝化作用的影响及反硝化过程中污泥特性的变化,考察反硝化作用后污泥呼吸图谱特征的变化。结果表明:反硝化前进行30 min的厌氧适应期可有效提高反硝化效果,当厌氧时间过长(120、300 min)时,污泥的反硝化性能恶化。在反硝化过程中污泥絮体粒径增大,导致活性污泥的内源呼吸速率(SOURe)和准内源呼吸速率(SOURq)明显增大,且NO3-还原速率随ΔSOURe的增大而增大 ...
张亚立   +3 more
doaj  

高浓度氨氮废水脱氮技术研究进展

open access: yesGongye shui chuli, 2008
结合高浓度氨氮废水的特点,评述了主要的氨氮处理技术,包括折点氯化法、吹脱法、选择性离子交换法、化学沉淀法及传统生物脱氮技术,同时还评述了硝化反硝化、亚硝酸型硝化反硝化、厌氧氨氧化以及亚硝酸型硝化-厌氧氨氧化等新型生物脱氮技术,介绍了它们的处理原理、研究现状、适宜条件和需要解决的问题,同时指出了高浓度氨氮废水处理技术今后的发展方向。
何岩, 赵由才, 周恭明
doaj   +2 more sources

添加零价铁的反硝化系统中发生的主要反应

open access: yesGongye shui chuli, 2021
分别采用零价铁、反硝化污泥及零价铁+反硝化污泥的系统处理含NO3--N的废水,探讨零价铁的添加对反硝化系统脱氮效果的影响及系统中发生的主要反应。结果表明,零价铁系统对废水中的NO3--N无去除效果;当零价铁+反硝化污泥系统对废水中NO3--N的去除率达到100%时,反硝化污泥系统对废水中的NO3--N去除率仅为60.1%。零价铁+反硝化污泥系统中主要发生零价铁参与的氧化还原反应及微生物参与的生物反硝化反应。
杨燕, 朱静平
doaj   +2 more sources

反硝化除磷技术及其影响因素分析

open access: yesGongye shui chuli, 2009
反硝化除磷技术是目前国内外污水脱氮除磷研究领域的新热点。基于其高效低能耗特性,探讨反硝化除磷的基本原理、介绍几种典型工艺、总结反硝化除磷的影响因素。通过分析认为NO3-和NO2-均可以作为最终电子受体进行缺氧吸磷,提出结合亚硝酸盐型硝化技术以实现短程硝化后的反硝化除磷,从而进一步达到节能降耗的目的。
马娟, 彭永臻, 王丽, 刘莹
doaj   +2 more sources

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