Modeling nitrogen loss using stable isotopes in mountainous watersheds of the Bohemian Slavkov Forest (NW Czech Republic)

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F25%3A10169515" target="_blank" >RIV/00025798:_____/25:10169515 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1002/vzj2.70033" target="_blank" >https://doi.org/10.1002/vzj2.70033</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/vzj2.70033" target="_blank" >10.1002/vzj2.70033</a>

Result language

angličtina

Original language name

Modeling nitrogen loss using stable isotopes in mountainous watersheds of the Bohemian Slavkov Forest (NW Czech Republic)

Original language description

This study presents an integrated hydrological-hydrochemical approach to quantify reactive nitrogen (N&lt;inf&gt;R&lt;/inf&gt;) cycling in temperate mountain catchments. It employs stable isotope analyses (δ&lt;sup&gt;2&lt;/sup&gt;H, δ&lt;sup&gt;18&lt;/sup&gt;O in water, δ&lt;sup&gt;15&lt;/sup&gt;N in NH&lt;inf&gt;4&lt;/inf&gt;&lt;sup&gt;+&lt;/sup&gt;, and NO&lt;inf&gt;3&lt;/inf&gt;&lt;sup&gt;MINUS SIGN &lt;/sup&gt; and δ&lt;sup&gt;18&lt;/sup&gt;O in NO&lt;inf&gt;3&lt;/inf&gt;&lt;sup&gt;MINUS SIGN &lt;/sup&gt;) to resolve interactions between water flow and N transformations. A two-component runoff model reveals groundwater as the dominant discharge contribution (75%-90%), with 10%-25% derived from rapidly infiltrating soil water-highlighting a swift hydrological response to precipitation. In addition, this work quantifies all N mineralization in vadose zone and denitrification in groundwater and their seasonal variation within a well-studied network of N-saturated temperate forests (i.e., the Czech GEOMON Network). Our results show that increased precipitation infiltration diminishes microbial N production and N&lt;inf&gt;2&lt;/inf&gt; losses, but maximizes catchment N&lt;inf&gt;R&lt;/inf&gt; exports. Direct input of atmospheric N&lt;inf&gt;R&lt;/inf&gt; to runoff was recorded during a short period of spring snow melting only. Denitrification calculated from &lt;sup&gt;15&lt;/sup&gt;N fractionation of NO&lt;inf&gt;3&lt;/inf&gt;&lt;sup&gt;MINUS SIGN &lt;/sup&gt; in soil and groundwater accounts for 15%-24% of total mineralized N (N loss is 0.6-1.6 kg N ha&lt;sup&gt;MINUS SIGN 1&lt;/sup&gt; year&lt;sup&gt;MINUS SIGN 1&lt;/sup&gt;), with precipitation shifts markedly influencing N&lt;inf&gt;R&lt;/inf&gt; outflows. This framework enhances predictions of climate change impacts on nutrient transport and water quality in mountain catchments, which are critical water sources for ecosystems and human use. Overall, application of this approach can offer key insights for mitigating ecological risks from increased N&lt;inf&gt;R&lt;/inf&gt; mobilization, especially under rising atmospheric N deposition and global warming effects.

Czech name

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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

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OECD FORD branch

10511 - Environmental sciences (social aspects to be 5.7)

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

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

Name of the periodical

VADOSE ZONE JOURNAL

ISSN

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e-ISSN

1539-1663

Volume of the periodical

24

Issue of the periodical within the volume

4

Country of publishing house

US - UNITED STATES

Number of pages

21

Pages from-to

nestránkováno

UT code for WoS article

001605588200016

EID of the result in the Scopus database

2-s2.0-105013837788