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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10505 - Geology

Project

<a href="/en/project/GA16-18079S" target="_blank" >GA16-18079S: Isotope constraints on microbial N2-fixation in ombrotrophic peat bogs</a><br>

Continuities

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

Publication year

2019

Confidentiality

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

Name of the periodical

Global Ecology and Conservation

ISSN

2351-9894

e-ISSN

—

Volume of the periodical

17

Issue of the periodical within the volume

January : e00571

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

13

Pages from-to

nestránkováno

UT code for WoS article

000465448800026

EID of the result in the Scopus database

2-s2.0-85062693479