Wetland microtopography alters response of potential net CO2 and CH4 production to temperature and moisture: Evidence from a laboratory experiment

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F86652079%3A_____%2F21%3A00545753" target="_blank" >RIV/86652079:_____/21:00545753 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S001670612100447X?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S001670612100447X?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.geoderma.2021.115367" target="_blank" >10.1016/j.geoderma.2021.115367</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Wetland microtopography alters response of potential net CO2 and CH4 production to temperature and moisture: Evidence from a laboratory experiment

Popis výsledku v původním jazyce

Coastal wetlands store significant amounts of carbon (C) belowground, which may be altered through effects of rising temperature and changing hydrology on CO2 and CH4 fluxes and related microbial activities. Wetland microtopography (hummock-hollow) also plays a critical role in mediating plant growth, microbial activity, and thus cycling of C and nutrients and may interact with rising seas to influence coastal wetland C dynamics. Recent evidence suggests that CH4 production in oxygenated surface soils of freshwater wetlands may contribute substantially to global CH4 production, but comprehensive studies linking potential CH4 production to environmental and microbial variables in temperate freshwater forested wetlands are lacking. This study investigated effects of temperature, moisture, and microtopography on potential net CO2 and CH4 production and extracellular enzyme activity (beta-glucosidase, xylosidase, phenol oxidase, and peroxidase) in peat soils collected from a freshwater forested wetland in coastal North Carolina, USA. Soils were retrieved from three microsites (hummock, hollow, and subsurface peat soils (approximately 20-40 cm below surface)) and incubated at two temperatures (27 degrees C and 32 degrees C) and soil water contents (65% and 100% water holding capacity (WHC)). Hummocks had the highest cumulative potential net CO2 (13.7 +/- 0.90 mg CO2-C g soil(-1)) and CH4 (1.8 +/- 0.42 mg CH4-C g soil(-1)) production and enzyme activity, followed by hollows (8.7 +/- 0.91 mg CO2-C g soil(-1) and 0.5 +/- 0.12 mg CH4-C g soil(-1)) and then subsurface soils (5.7 +/- 0.70 mg CO2-C g soil(-1) and 0.04 +/- 0.019 mg CH4-C g soil(-1)). Fully saturated soils had lower potential net CO2 production (50-80%) and substantially higher potential net CH4 production compared to non-saturated soils (those incubated at 65% WHC). Soils incubated at 32 degrees C increased potential net CO2 (24-34%) and CH4 (56-404%) production under both soil moisture levels compared to those incubated at 27 degrees C. The Q(10) values for potential net CO2 and CH4 production ranged from 1.5 to 2.3 and 3.3-8.8, respectively, and did not differ between any microsites or soil water content. Enrichment of delta(CO2)-C-13-C was found in saturated soils from all microsites (-24.4 to 29.7 parts per thousand) compared to non-saturated soils (-31.1 to 32.4 parts per thousand), while delta(CH4)-C-13-C ranged from62 to55 parts per thousand in saturated soils. Together, the CO2 and CH4 delta C-13 data suggest that acetoclastic methanogenesis is an important pathway for CH4 production in these wetlands. A positive relationship (Adj. R-2 = 0.40) between peroxidase activity and CH(4 )production was also found, indicating that peroxidase activity may be important in providing fermented C substrates to acetoclastic methanogenic communities and contribute to anaerobic C mineralization.

Název v anglickém jazyce

Wetland microtopography alters response of potential net CO2 and CH4 production to temperature and moisture: Evidence from a laboratory experiment

Popis výsledku anglicky

Coastal wetlands store significant amounts of carbon (C) belowground, which may be altered through effects of rising temperature and changing hydrology on CO2 and CH4 fluxes and related microbial activities. Wetland microtopography (hummock-hollow) also plays a critical role in mediating plant growth, microbial activity, and thus cycling of C and nutrients and may interact with rising seas to influence coastal wetland C dynamics. Recent evidence suggests that CH4 production in oxygenated surface soils of freshwater wetlands may contribute substantially to global CH4 production, but comprehensive studies linking potential CH4 production to environmental and microbial variables in temperate freshwater forested wetlands are lacking. This study investigated effects of temperature, moisture, and microtopography on potential net CO2 and CH4 production and extracellular enzyme activity (beta-glucosidase, xylosidase, phenol oxidase, and peroxidase) in peat soils collected from a freshwater forested wetland in coastal North Carolina, USA. Soils were retrieved from three microsites (hummock, hollow, and subsurface peat soils (approximately 20-40 cm below surface)) and incubated at two temperatures (27 degrees C and 32 degrees C) and soil water contents (65% and 100% water holding capacity (WHC)). Hummocks had the highest cumulative potential net CO2 (13.7 +/- 0.90 mg CO2-C g soil(-1)) and CH4 (1.8 +/- 0.42 mg CH4-C g soil(-1)) production and enzyme activity, followed by hollows (8.7 +/- 0.91 mg CO2-C g soil(-1) and 0.5 +/- 0.12 mg CH4-C g soil(-1)) and then subsurface soils (5.7 +/- 0.70 mg CO2-C g soil(-1) and 0.04 +/- 0.019 mg CH4-C g soil(-1)). Fully saturated soils had lower potential net CO2 production (50-80%) and substantially higher potential net CH4 production compared to non-saturated soils (those incubated at 65% WHC). Soils incubated at 32 degrees C increased potential net CO2 (24-34%) and CH4 (56-404%) production under both soil moisture levels compared to those incubated at 27 degrees C. The Q(10) values for potential net CO2 and CH4 production ranged from 1.5 to 2.3 and 3.3-8.8, respectively, and did not differ between any microsites or soil water content. Enrichment of delta(CO2)-C-13-C was found in saturated soils from all microsites (-24.4 to 29.7 parts per thousand) compared to non-saturated soils (-31.1 to 32.4 parts per thousand), while delta(CH4)-C-13-C ranged from62 to55 parts per thousand in saturated soils. Together, the CO2 and CH4 delta C-13 data suggest that acetoclastic methanogenesis is an important pathway for CH4 production in these wetlands. A positive relationship (Adj. R-2 = 0.40) between peroxidase activity and CH(4 )production was also found, indicating that peroxidase activity may be important in providing fermented C substrates to acetoclastic methanogenic communities and contribute to anaerobic C mineralization.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10606 - Microbiology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Geoderma

ISSN

0016-7061

e-ISSN

1872-6259

Svazek periodika

402

Číslo periodika v rámci svazku

NOV

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

13

Strana od-do

115367

Kód UT WoS článku

000688581600023

EID výsledku v databázi Scopus

2-s2.0-85111505002