Del15N systematics in two minerotrophic peatlands in the eastern U.S.: Insights into nitrogen cycling under moderate pollution

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F19%3A00000171" target="_blank" >RIV/00025798:_____/19:00000171 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S2351989418303858?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2351989418303858?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.gecco.2019.e00571" target="_blank" >10.1016/j.gecco.2019.e00571</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Del15N systematics in two minerotrophic peatlands in the eastern U.S.: Insights into nitrogen cycling under moderate pollution

Popis výsledku v původním jazyce

Availability of reactive nitrogen (Nr; mainly ammonium, NH4+, and nitrate, NO3-) via precipitation and upwelling groundwater affects carbon (C) accumulation in peat deposits and biological greenhouse gas emissions. Isotope composition of Nr was studied at Wolf Swamp (WS) and The Glades (GL), two peatlands located in western Maryland (U.S.), to provide a more robust understanding of N cycling at the ecosystem level. In recent years, both sites experienced a moderate atmospheric pollution (3 to 9 kg of deposited Nr ha-1 yr-1), and possible additional Nr inputs via groundwater contaminated by fertilizers/livestock. Sampling of living Sphagnum, vertical peat profiles, atmospheric deposition, and surface bog water was carried out on October 22-24, 2017. The 15Nr signatures of vertical precipitation were negative (mass-weighted means of -7.2 and -8.1 per mille, at WS and GL, respectively) despite reports that NOx emitted by coal-burning power plants, a precursor of deposited nitrate, had been extremely positive (up to +26 per mille). Mean 15N values at both sites increased in the order: vertical precipitation < living Sphagnum < atmospheric N2 < surface bog water < maturating peat. Intermediate 15N values of living Sphagnum (-1.5 per mille at both sites) suggested simultaneous incorporation of isotopically light atmospheric Nr and isotopically heavy Nr from bog water in the newly formed biomass. The 15N values of bulk peat increased downcore by 4.5 and 4.9 per mille at WS and GL, respectively. Gradual mineralization of organic N, mainly by nitrification and denitrification, is isotopically selective, leaving behind higher 15N values of bulk peat at greater peat depths. Nitrogen concentration gradients and 15N trends in vertical peat profiles at these locations therefore cannot be used as an archive of past changes in pollution levels and N isotope signatures of incoming Nr.

Název v anglickém jazyce

Del15N systematics in two minerotrophic peatlands in the eastern U.S.: Insights into nitrogen cycling under moderate pollution

Popis výsledku anglicky

Availability of reactive nitrogen (Nr; mainly ammonium, NH4+, and nitrate, NO3-) via precipitation and upwelling groundwater affects carbon (C) accumulation in peat deposits and biological greenhouse gas emissions. Isotope composition of Nr was studied at Wolf Swamp (WS) and The Glades (GL), two peatlands located in western Maryland (U.S.), to provide a more robust understanding of N cycling at the ecosystem level. In recent years, both sites experienced a moderate atmospheric pollution (3 to 9 kg of deposited Nr ha-1 yr-1), and possible additional Nr inputs via groundwater contaminated by fertilizers/livestock. Sampling of living Sphagnum, vertical peat profiles, atmospheric deposition, and surface bog water was carried out on October 22-24, 2017. The 15Nr signatures of vertical precipitation were negative (mass-weighted means of -7.2 and -8.1 per mille, at WS and GL, respectively) despite reports that NOx emitted by coal-burning power plants, a precursor of deposited nitrate, had been extremely positive (up to +26 per mille). Mean 15N values at both sites increased in the order: vertical precipitation < living Sphagnum < atmospheric N2 < surface bog water < maturating peat. Intermediate 15N values of living Sphagnum (-1.5 per mille at both sites) suggested simultaneous incorporation of isotopically light atmospheric Nr and isotopically heavy Nr from bog water in the newly formed biomass. The 15N values of bulk peat increased downcore by 4.5 and 4.9 per mille at WS and GL, respectively. Gradual mineralization of organic N, mainly by nitrification and denitrification, is isotopically selective, leaving behind higher 15N values of bulk peat at greater peat depths. Nitrogen concentration gradients and 15N trends in vertical peat profiles at these locations therefore cannot be used as an archive of past changes in pollution levels and N isotope signatures of incoming Nr.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GA16-18079S" target="_blank" >GA16-18079S: Izotopové doklady mikrobiální fixace dusíku v ombrotrofních mokřadech</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Global Ecology and Conservation

ISSN

2351-9894

e-ISSN

—

Svazek periodika

17

Číslo periodika v rámci svazku

January : e00571

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

13

Strana od-do

nestránkováno

Kód UT WoS článku

000465448800026

EID výsledku v databázi Scopus

2-s2.0-85062693479