Long-term changes in the inorganic nitrogen output fluxes in European ICP Integrated Monitoring catchments - an assessment of the role of N-related parameters in catchments

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F18%3A00000279" target="_blank" >RIV/00025798:_____/18:00000279 - isvavai.cz</a>

Result on the web

<a href="http://hdl.handle.net/10138/238583" target="_blank" >http://hdl.handle.net/10138/238583</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Long-term changes in the inorganic nitrogen output fluxes in European ICP Integrated Monitoring catchments - an assessment of the role of N-related parameters in catchments

Original language description

The present trend of TIN deposition at IM sites is decreasing, which should generally lead to decreased NO3 concentrations in runoff. The trends for the concentrations and output fluxes of TIN at IM sites are,however, still variable, indicating that surface water-watershed nitrogen dynamics are inherently complex, as nitrogen is strongly affected by biological processes and hydrological conditions, and nitrate concentrations in surface waters may fluctuate greatly by season and spatially across ecosystems. Elevated leaching losses of TIN aregenerally linked to high N deposition, but losses and trends of NO3 may be highly variable between sites exposed to relatively similar levels of N deposition. It is obvious that also other factors than TIN deposition – which are not yet fully understood – may largely modify TIN losses and trends from forested catchments. Long-term trends in the annual input-output budgets of TIN and monthly runoff water chemistry and fluxes of TIN in IM catchments were evaluated in relation to changes in emissions and hydrometeorological conditions. Variations of retention/net release of TIN in catchments and NO3 concentrations in runoff for each of the study sites were explained using multiple statistical analysis. The influence of long-term variation of climatic variables and deposition on TIN concentrations in runoff at single sites did not strongly arise from this data set and analysis (Fig. 3.3), but it is obvious that not all potential driverswere included in the empirical models in these studies. The IM sites are located in areas with very different N deposition gradients, and further analysis with specific catchment data, such as landscape and soil data, is needed to elucidate the variation in inorganic N concentrations at IM sites (see literature review of Weldon in this report regarding the importance of different processes involved). The next phase ofthe work will be an assessment of the role of N-related parameters in the IM catchments, involving collection and analysis of available landscape data and physical and chemical soil data. The main aims of the study are to evaluate the present status of these internal nitrogen parameters, and to analyse if these parameters explain the variation/trends at IM sites. The national focal points and the representatives for the sites will be invited to assist with these activities.

Czech name

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Czech description

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Type

J_ost - Miscellaneous article in a specialist periodical

CEP classification

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OECD FORD branch

10511 - Environmental sciences (social aspects to be 5.7)

Project

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Continuities

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Publication year

2018

Confidentiality

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

Name of the periodical

Reports of Finnish Environment Institute

ISSN

1796-1718

e-ISSN

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Volume of the periodical

20

Issue of the periodical within the volume

August

Country of publishing house

FI - FINLAND

Number of pages

15

Pages from-to

34-38

UT code for WoS article

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EID of the result in the Scopus database

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