An Increase in Stream Water DOC Concentrations May Not Necessarily Imply an Increase in DOC Fluxes in Areas Affected by Acid Deposition and Climate Change-An Example from Central European Catchments

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F86652079%3A_____%2F24%3A00598437" target="_blank" >RIV/86652079:_____/24:00598437 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.mdpi.com/2073-4441/16/16/2220" target="_blank" >https://www.mdpi.com/2073-4441/16/16/2220</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/w16162220" target="_blank" >10.3390/w16162220</a>

Jazyk výsledku

angličtina

Název v původním jazyce

An Increase in Stream Water DOC Concentrations May Not Necessarily Imply an Increase in DOC Fluxes in Areas Affected by Acid Deposition and Climate Change-An Example from Central European Catchments

Popis výsledku v původním jazyce

Over a period of 30 years (1993-2022), headwater catchments in the Slavkov Forest (Czech Republic) exhibited a robust increase in stream water DOC (dissolved organic carbon) concentrations following a significant reduction in acidic atmospheric deposition. Sulfur deposition decreased from 34 kg ha-1 yr-1 in 1993 to 2.6 kg ha-1 yr-1 in 2022. Three Norway-spruce-dominated research sites-& Ccaronern & yacute, Potok (CEP), a 15.2 ha peatbog catchment, Lysina (LYS), a 27.3 ha granitic catchment, and Pluh & uringv Bor (PLB), a 21.6 ha serpentinite catchment, were investigated. The three-year average DOC concentration increased from 48.2 mg L-1 (1993-1995) to 68.3 mg L-1 (2020-2022) at CEP (0.69 mg L-1 yr-1). LYS showed an increase from 16.9 mg L-1 to 25.4 mg L-1 (0.30 mg L-1 yr-1 annually). The largest increase was recorded at PLB, with an increase from 15.7 mg L-1 to 36.7 mg L-1 (0.89 mg L-1 yr-1). A decline in ionic strength was identified as the main driver of the DOC increase. The annual runoff declined significantly at CEP and LYS from 465 mm to 331 mm as a result of rising air temperatures and reduced precipitation between 2014 and 2022. PLB (average of 266 mm) did not show a statistically significant decline. Recently, PLB experienced significant deforestation that likely lowered transpiration and thus increased catchment runoff. As a result, DOC fluxes did not change significantly at CEP (average 210 kg ha-1 yr-1) and LYS (90 kg ha1 yr-1). However, PLB's DOC flux more than doubled, increasing from 44 to 106 kg ha-1 yr-1. Drivers connected with global change, such as increasing temperatures, or potential chemical drivers, such as reductions in Al concentrations and pH changes, were not able to explain the observed changes in DOC concentra tions and fluxes.

Název v anglickém jazyce

An Increase in Stream Water DOC Concentrations May Not Necessarily Imply an Increase in DOC Fluxes in Areas Affected by Acid Deposition and Climate Change-An Example from Central European Catchments

Popis výsledku anglicky

Over a period of 30 years (1993-2022), headwater catchments in the Slavkov Forest (Czech Republic) exhibited a robust increase in stream water DOC (dissolved organic carbon) concentrations following a significant reduction in acidic atmospheric deposition. Sulfur deposition decreased from 34 kg ha-1 yr-1 in 1993 to 2.6 kg ha-1 yr-1 in 2022. Three Norway-spruce-dominated research sites-& Ccaronern & yacute, Potok (CEP), a 15.2 ha peatbog catchment, Lysina (LYS), a 27.3 ha granitic catchment, and Pluh & uringv Bor (PLB), a 21.6 ha serpentinite catchment, were investigated. The three-year average DOC concentration increased from 48.2 mg L-1 (1993-1995) to 68.3 mg L-1 (2020-2022) at CEP (0.69 mg L-1 yr-1). LYS showed an increase from 16.9 mg L-1 to 25.4 mg L-1 (0.30 mg L-1 yr-1 annually). The largest increase was recorded at PLB, with an increase from 15.7 mg L-1 to 36.7 mg L-1 (0.89 mg L-1 yr-1). A decline in ionic strength was identified as the main driver of the DOC increase. The annual runoff declined significantly at CEP and LYS from 465 mm to 331 mm as a result of rising air temperatures and reduced precipitation between 2014 and 2022. PLB (average of 266 mm) did not show a statistically significant decline. Recently, PLB experienced significant deforestation that likely lowered transpiration and thus increased catchment runoff. As a result, DOC fluxes did not change significantly at CEP (average 210 kg ha-1 yr-1) and LYS (90 kg ha1 yr-1). However, PLB's DOC flux more than doubled, increasing from 44 to 106 kg ha-1 yr-1. Drivers connected with global change, such as increasing temperatures, or potential chemical drivers, such as reductions in Al concentrations and pH changes, were not able to explain the observed changes in DOC concentra tions and fluxes.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10503 - Water resources

Projekt

<a href="/cs/project/GC21-22810J" target="_blank" >GC21-22810J: Vztah mezi chemickým složením rozpuštěné organické hmoty a cyklem živin v lesních povodích mírného pásma</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Water

ISSN

2073-4441

e-ISSN

2073-4441

Svazek periodika

16

Číslo periodika v rámci svazku

16

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

16

Strana od-do

2220

Kód UT WoS článku

001309018700001

EID výsledku v databázi Scopus

2-s2.0-85202451750