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首页> 外文期刊>Aquatic Sciences >Leaching and microbial degradation of dissolved organic matter from salt marsh plants and seagrasses
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Leaching and microbial degradation of dissolved organic matter from salt marsh plants and seagrasses

机译：盐沼植物和海草中溶解性有机物的浸出和微生物降解

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摘要

Dissolved organic matter (DOM) is outwelled from highly productive salt marshes, but its sources and fates are unclear. To examine common salt marsh plants as sources of coastal DOM, two dominant salt marsh vascular plants Spartina alterniflora and Juncus roemarianus, and two major coastal seagrasses Syringodium filiforme and Halodule wrightii, were collected from a Florida salt marsh and studied using laboratory incubation experiments. We investigated the leaching dynamics of dissolved organic carbon (DOC), total dissolved nitrogen (TDN), and chro-mophoric dissolved organic matter (CDOM) from these plants, in conjunction with our field investigations of the sources and outwelling of DOM from Florida salt marshes. The leaching of DOM and CDOM from the plants was a rapid process, and leaching rates were 65-288 μM/ g dry weight/day for DOC and 3.8-16 μM/g dry weight/ day for TDN from different plants in the bacteria-inhibited incubations. DOC was proportional to TDN in the leach-ates, but the quantity of C and N leached was dependent on the species and growth stage of the plants. At the end of the 25-day experiments, 5.4-23 % and 10-45 % of solid phase C and N were released into DOC and TDN pools, respectively. Bacteria played an important role during the leaching process. The majority of DOC and TDN leached from marsh plants and seagrasses was labile and highly biodegradable with 56-90 % of the leached DOC and 44-72 % of the leached TDN being decomposed at the end of the experiments. The fluorescence measurements of CDOM indicate that organic matter leached from marsh plants and seagrasses contained mainly protein-like DOM which was degraded rapidly by bacteria. Our study suggests that leaching of DOM from salt marsh plants and seagrasses provide not only major sources of DOC, TDN, and CDOM that affect many biogeochemical processes, but also as important food sources to microbial communities in the marsh and adjacent coastal waters.
机译：高产盐沼中溶解的有机物（DOM）数量过多，但其来源和命运尚不清楚。为了检查作为沿海DOM来源的普通盐沼植物，从佛罗里达盐沼中收集了两种优势盐沼维管植物Spartina alterniflora和Juncus roemarianus，以及两种主要沿海海草丝状丁香和Halodule wrightii，并使用实验室孵育实验进行了研究。我们调查了这些植物中溶解有机碳（DOC），总溶解氮（TDN）和色度溶解性有机物（CDOM）的浸出动力学，并结合我们对佛罗里达盐中DOM的来源和分布进行了现场调查沼泽。从植物中浸出DOM和CDOM是一个快速过程，细菌中不同植物的DOC浸出率为65-288μM/ g干重/天，而TDN则为3.8-16μM/ g干重/天。抑制孵化。 DOC在浸出物中与TDN成正比，但浸出的C和N的量取决于植物的种类和生长阶段。在25天的实验结束时，分别将5.4-23％和10-45％的固相C和N释放到DOC和TDN库中。细菌在浸出过程中起着重要作用。从沼泽植物和海草中浸出的大多数DOC和TDN不稳定且高度可生物降解，在实验结束时，有56-90％的浸出DOC和44-72％的浸出TDN被分解。 CDOM的荧光测量表明，从沼泽植物和海草中滤出的有机物主要含有蛋白质样DOM，并被细菌迅速降解。我们的研究表明，从盐沼植物和海草中浸出的DOM不仅提供了影响许多生物地球化学过程的DOC，TDN和CDOM的主要来源，而且还成为了沼泽和邻近沿海水域微生物群落的重要食物来源。

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  • 来源
    《Aquatic Sciences》 |2014年第4期|595-609|共15页
  • 作者

    Xuchen Wang; Robert F. Chen; Jaye E. Cable; Jennifer Cherrier;

  • 作者单位

    Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China,School for the Environment, University of Massachusetts at Boston, Boston, MA 02125, USA;

    School for the Environment, University of Massachusetts at Boston, Boston, MA 02125, USA;

    Department of Marine Sciences, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA;

    School of the Environment, Florida A&M University, Tallahassee, FL 32307, USA;

  • 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

    Dissolved organic carbon; Chromophoric dissolved organic matter; Salt marsh; Marsh plant; Seagrass;

    机译：溶解的有机碳;发色溶解的有机物;盐沼沼泽植物;海草;

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