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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10511 - Environmental sciences (social aspects to be 5.7)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

VADOSE ZONE JOURNAL

ISSN

—

e-ISSN

1539-1663

Svazek periodika

24

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

21

Strana od-do

nestránkováno

Kód UT WoS článku

001605588200016

EID výsledku v databázi Scopus

2-s2.0-105013837788