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首页> 外文学位 >Nitrous oxide fluxes in red mangroves sediments on the south west coast of Puerto Rico (Rhizophora mangle).
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Nitrous oxide fluxes in red mangroves sediments on the south west coast of Puerto Rico (Rhizophora mangle).

机译：波多黎各西南海岸的红树林中的一氧化二氮通量（Rhizophora mangle）。

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摘要

Measurements of nitrous oxide concentrations in air and sediment/air fluxes were performed in different mangrove (Rhizophora mangle) sediments on the southwest coast of Puerto Rico. N2O was quantified by gas chromatography using a 63Ni electron capture detector and incubation chamber techniques. Baseline N2O concentrations averaged 314 ppb with a range from 267 ppb to 353 ppb. Fluxes ranged from −860.7 to 818.8 nmole.m−2 h−1 with an overall mean of 125 nmole.m−2 h−1. Ninety-one percent of the measurements exhibited net N2O flux to the atmosphere while the balance exhibited consumption by the sediments. N2O production was higher (23%) at low tide when sediments are exposed to air, indicating that nitrification is the probable mechanism of N2O production. Ammonium was the most abundant dissolved inorganic nitrogenous species with concentration, ranging from 23 μM to 342.7 μM. N2O fluxes were enhanced in response to ammonium and nitrate loading. The highest fluxes were obtained with NH4+ addition to the sediments reaching saturation near 0.9 mol.m−2, with a mean N 2O flux of 52 μmole.m−2 h−1. The NO3− curve exhibits an exponential growth with a maximum mean flux of 36.7 μmol.m−2 h −1. We conclude that nitrifying bacteria are the main precursors of N2O in red mangrove sediments.
机译：在波多黎各西南海岸的不同红树林（ Rhizophora mangle ）沉积物中进行了空气和沉积物/通气量中一氧化二氮浓度的测量。使用 63 Ni电子捕获检测器和孵育室技术通过气相色谱法对N 2 O进行定量。基线N 2 O浓度平均为314 ppb，范围为267 ppb至353 ppb。通量范围为−860.7至818.8 nmole.m −2 h -1 ，总平均值为125 nmole.m -2 h −1 。百分之九十一的测量值显示出净N 2的净通量，而其余部分则显示出沉积物的消耗。沉积物暴露在空气中时，低潮时N 2 O的产生较高（23％），这表明硝化作用是N 2 O产生的可能机理。铵是最丰富的溶解性无机含氮物质，浓度范围为23μM至342.7μM。 N 2 O通量随着铵盐和硝酸盐的增加而增加。加入NH 4 + 可获得最高通量，沉积物在0.9 mol.m -2 附近达到饱和，平均N 2 O流量为52μmol.m −2 h -1 。 NO 3 -曲线呈指数增长，最大平均通量为36.7μmol.m -2 h -1 。我们得出结论，硝化细菌是红树林沉积物中N 2 O的主要前体。

著录项

  • 作者

    Munoz-Hincapie, Milton Fernando.;

  • 作者单位

    University of Puerto Rico, Mayaguez (Puerto Rico).;

  • 授予单位 University of Puerto Rico, Mayaguez (Puerto Rico).;
  • 学科 Biology Oceanography.; Geochemistry.; Environmental Sciences.
  • 学位 M.M.S.
  • 年度 2001
  • 页码 p.167
  • 总页数 96
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋生物;
  • 关键词

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