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Photochemical degradation of dissolved organic matter reduces the availability of phosphorus for aquatic primary producers

Identifikátory výsledku

  • Kód výsledku v IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F18%3A43897585" target="_blank" >RIV/60076658:12310/18:43897585 - isvavai.cz</a>

  • Nalezeny alternativní kódy

    RIV/60077344:_____/18:00487076

  • Výsledek na webu

    <a href="https://reader.elsevier.com/reader/sd/pii/S0045653517319173?token=9EF7FB4B73CF2AC642AF741C422DD88ED2222B84B7397D05AFF9C0D24AC47AAA9A91CBEC04FD0642EB4710D12041FCB9" target="_blank" >https://reader.elsevier.com/reader/sd/pii/S0045653517319173?token=9EF7FB4B73CF2AC642AF741C422DD88ED2222B84B7397D05AFF9C0D24AC47AAA9A91CBEC04FD0642EB4710D12041FCB9</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1016/j.chemosphere.2017.11.140" target="_blank" >10.1016/j.chemosphere.2017.11.140</a>

Alternativní jazyky

  • Jazyk výsledku

    angličtina

  • Název v původním jazyce

    Photochemical degradation of dissolved organic matter reduces the availability of phosphorus for aquatic primary producers

  • Popis výsledku v původním jazyce

    In situ experiments were done to determine the effects of the photochemical degradation of dissolved organic matter (DOM) and subsequent formation of particulate matter on dissolved phosphorus (P) concentrations in surface waters. Filtered (1.2 or 0.4 mu m) headwaters (DOM of 8.1-26 mg L-1; P of 22 -43 mu g L-1) were exposed to solar radiation in quartz bottles located 5 cm below the water surface for 7 -10 days. Dark controls were wrapped in aluminum foil. After incubation, particulate organic carbon (POC) and particulate phosphorus (PP) were determined in both the filtrate and newly formed particles. The results revealed increasing concentrations of PP and POC in exposed samples with increasing exposure time (cumulative irradiation energy). At the end of experiments, PP concentrations were from 5 to 20 mu g L-1 in the exposed samples. Based on an enumeration of bacteria in the samples, we estimated the contribution of biotic and abiotic processes to the PP production. The abiotic PP formation ranged from 56 to 83% and 50-95% of the total PP in the exposed and control samples, respectively. The remainder was assumed to be bacterial P uptake. Despite the overlapping intervals, biotic and abiotic PP productions were usually higher in exposed samples than in controls. The PP and POC production was affected by the properties of DOM, such as its humic content and freshness index. We hypothesize that the observed immobilization of dissolved P in bacteria and on photochemically-formed particles can contribute to a P limitation of primary production in headwater environments that receive waters rich in soil DOM.

  • Název v anglickém jazyce

    Photochemical degradation of dissolved organic matter reduces the availability of phosphorus for aquatic primary producers

  • Popis výsledku anglicky

    In situ experiments were done to determine the effects of the photochemical degradation of dissolved organic matter (DOM) and subsequent formation of particulate matter on dissolved phosphorus (P) concentrations in surface waters. Filtered (1.2 or 0.4 mu m) headwaters (DOM of 8.1-26 mg L-1; P of 22 -43 mu g L-1) were exposed to solar radiation in quartz bottles located 5 cm below the water surface for 7 -10 days. Dark controls were wrapped in aluminum foil. After incubation, particulate organic carbon (POC) and particulate phosphorus (PP) were determined in both the filtrate and newly formed particles. The results revealed increasing concentrations of PP and POC in exposed samples with increasing exposure time (cumulative irradiation energy). At the end of experiments, PP concentrations were from 5 to 20 mu g L-1 in the exposed samples. Based on an enumeration of bacteria in the samples, we estimated the contribution of biotic and abiotic processes to the PP production. The abiotic PP formation ranged from 56 to 83% and 50-95% of the total PP in the exposed and control samples, respectively. The remainder was assumed to be bacterial P uptake. Despite the overlapping intervals, biotic and abiotic PP productions were usually higher in exposed samples than in controls. The PP and POC production was affected by the properties of DOM, such as its humic content and freshness index. We hypothesize that the observed immobilization of dissolved P in bacteria and on photochemically-formed particles can contribute to a P limitation of primary production in headwater environments that receive waters rich in soil DOM.

Klasifikace

  • Druh

    J<sub>imp</sub> - Článek v periodiku v databázi Web of Science

  • CEP obor

  • OECD FORD obor

    50704 - Environmental sciences (social aspects)

Návaznosti výsledku

  • Projekt

  • Návaznosti

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Ostatní

  • Rok uplatnění

    2018

  • Kód důvěrnosti údajů

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Údaje specifické pro druh výsledku

  • Název periodika

    Chemosphere

  • ISSN

    0045-6535

  • e-ISSN

  • Svazek periodika

    193

  • Číslo periodika v rámci svazku

    FEB 2018

  • Stát vydavatele periodika

    GB - Spojené království Velké Británie a Severního Irska

  • Počet stran výsledku

    9

  • Strana od-do

    1018-1026

  • Kód UT WoS článku

    000423890500119

  • EID výsledku v databázi Scopus

    2-s2.0-85034998105