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