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首页> 外文期刊>Wetlands >Short-Term Effect of Exogenous Nitrogen on N_2O Fluxes from Native and Invaded Tidal Marshes in the Min River Estuary, China
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Short-Term Effect of Exogenous Nitrogen on N_2O Fluxes from Native and Invaded Tidal Marshes in the Min River Estuary, China

机译：外源氮对the河口原生和入侵潮汐沼泽N_2O通量的短期影响

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摘要

Tidal marshes play an important functional role in removing nitrogen (N) pollution before delivery to coastal and ocean systems; however, little is known about their removal capacity as N2O gas emissions from different plant species. To evaluate the effects of N inputs on N2O emissions from tidal marshes, we measured N2O fluxes from native (Cyperus malaccensis) and invaded (Spartina alterniflora) tidal marshes in the Min River estuary, and fertilized with exogenous N at the rates of 0, 21 and 42gNm(-2)yr.(-1), respectively. S. alterniflora invasion did not significantly influence N2O emissions from the C. malaccensis marsh under natural conditions, but under N addition conditions, the invasion of S. alterniflora decreased N2O emissions, primarily owing to its stronger N uptake capacity. Exogenous N had significant positive effects on N2O fluxes in both native and invaded tidal marshes. Moreover, significant temporal variability of N2O fluxes was observed after N was gradually added to the native and invaded marshes. Within 3h of N addition, N2O fluxes were significantly higher in plots receiving N additions relative to controls. After 8days, few significant differences were found between treatments. Moreover, electrical conductivity, pH and oxidation-reduction potential at different soil depths were not significantly affected by N addition. Considering N addition showed extremely high positive effects on N2O fluxes at the hours scale, the overall increase of N2O emissions from wetlands in response to N addition may be significantly underestimated. To better assess the global climatic role of salt marshes that have been affected by N addition, the short-term temporal variability of N2O emissions should receive greater attention.
机译：潮汐沼泽在输送到沿海和海洋系统之前，在消除氮（N）污染方面起着重要的功能作用；但是，人们对于它们作为不同植物物种产生的N2O气体的排放能力的了解却很少。为了评估氮输入对潮汐沼泽N2O排放的影响，我们测量了敏河河口天然马来酸酐（Cyperus malaccensis）和入侵潮沼（Spartina alterniflora）潮汐中的N2O通量，并以0、21的速率施以外源N和42gNm（-2）yr。（-1）。在自然条件下，互花米草的入侵并没有显着影响马六甲沼泽地N2O的排放，但是在添加氮的条件下，互花米草的入侵减少了N2O的排放，这主要是由于其对氮的吸收能力较强。外源氮对原生和入侵潮汐沼泽中的N2O通量均具有显着的正效应。此外，在将N逐渐添加到自然沼泽和入侵沼泽后，观察到N2O通量的明显时间变化。在添加N的3小时内，相对于对照，在接受N添加的地块中，N2O通量显着更高。 8天后，治疗之间几乎没有发现显着差异。此外，不同土壤深度下的电导率，pH值和氧化还原电位不受氮添加的影响。考虑到氮的添加在小时尺度上对N2O通量具有极高的正效应，因此可能会大大低估了湿地N2O排放量随N的添加而增加的总体幅度。为了更好地评估受氮添加影响的盐沼的全球气候作用，应注意N2O排放的短期时间变化。

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  • 来源
    《Wetlands》 |2019年第1期|139-148|共10页
  • 作者

    Mou Xiaojie; Liu Xingtu; Sun Zhigao; Tong Chuan; Lu Xinrui;

  • 作者单位

    Chinese Acad Sci, Northeast Inst Geog & Agroecol, Key Lab Wetland Ecol & Environm, Changchun 130102, Jilin, Peoples R China;

    Chinese Acad Sci, Northeast Inst Geog & Agroecol, Key Lab Wetland Ecol & Environm, Changchun 130102, Jilin, Peoples R China;

    Fujian Normal Univ, Inst Geog, Minist Educ, Key Lab Humid Subtrop Ecogeog Proc, Fuzhou 350007, Fujian, Peoples R China;

    Fujian Normal Univ, Inst Geog, Minist Educ, Key Lab Humid Subtrop Ecogeog Proc, Fuzhou 350007, Fujian, Peoples R China;

    Chinese Acad Sci, Northeast Inst Geog & Agroecol, Key Lab Wetland Ecol & Environm, Changchun 130102, Jilin, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Nitrogen addition; N2O flux; Tidal marsh; Invasive species; Temporal variability;

    机译：氮肥;N2O通量;潮沼;入侵物种;时间变异;

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