Carbon-nitrogen interactions in European forests and semi-natural vegetation - Part 1: Fluxes and budgets of carbon, nitrogen and greenhouse gases from ecosystem monitoring and modelling
Artikel i vetenskaplig tidskrift, 2020

The impact of atmospheric reactive nitrogen (N-r) deposition on carbon (C) sequestration in soils and biomass of unfertilized, natural, semi-natural and forest ecosystems has been much debated. Many previous results of this dC/dN response were based on changes in carbon stocks from periodical soil and ecosystem inventories, associated with estimates of N-r deposition obtained from large-scale chemical transport models. This study and a companion paper (Flechard et al., 2020) strive to reduce uncertainties of N effects on C sequestration by linking multi-annual gross and net ecosystem productivity estimates from 40 eddy covariance flux towers across Europe to local measurement-based estimates of dry and wet N-r deposition from a dedicated collocated monitoring network. To identify possible ecological drivers and processes affecting the interplay between C and N-r inputs and losses, these data were also combined with in situ flux measurements of NO, N2O and CH4 fluxes; soil NO3- leaching sampling; and results of soil incubation experiments for N and greenhouse gas (GHG) emissions, as well as surveys of available data from online databases and from the literature, together with forest ecosystem (BAS-FOR) modelling. Multi-year averages of net ecosystem productivity (NEP) in forests ranged from -70 to 826 gCm(-2) yr(-1) at total wet + dry inorganic N-r deposition rates (N-dep) of 0.3 to 4.3 gNm(-2) yr(-1) and from -4 to 361 g Cm-2 yr(-1) at N-dep rates of 0.1 to 3.1 gNm(-2) yr(-1) in short semi-natural vegetation (moorlands, wetlands and unfertilized extensively managed grasslands). The GHG budgets of the forests were strongly dominated by CO2 exchange, while CH4 and N2O exchange comprised a larger proportion of the GHG balance in short semi-natural vegetation. Uncertainties in elemental budgets were much larger for nitrogen than carbon, especially at sites with elevated N-dep where N-r leaching losses were also very large, and compounded by the lack of reliable data on organic nitrogen and N-2 losses by denitrification. Nitrogen losses in the form of NO, N2O and especially NO3- were on average 27%(range 6 %-54 %) of N-dep at sites with N-dep < 1 gNm(-2) yr(-1) versus 65% (range 35 %-85 %) for N-dep > 3 gNm(-2) yr(-1). Such large levels of N-r loss likely indicate that different stages of N saturation occurred at a number of sites. The joint analysis of the C and N budgets provided further hints that N saturation could be detected in altered patterns of forest growth. Net ecosystem productivity increased with N-r deposition up to 2-2.5 gNm(-2) yr(-1), with large scatter associated with a wide range in carbon sequestration efficiency (CSE, defined as the NEP/GPP ratio). At elevated N-dep levels (> 2.5 gNm(-2) yr(-1)), where inorganic N-r losses were also increasingly large, NEP levelled off and then decreased. The apparent increase in NEP at low to intermediate N-dep levels was partly the result of geographical cross-correlations between N-dep and climate, indicating that the actual mean dC/dN response at individual sites was significantly lower than would be suggested by a simple, straightforward regression of NEP vs. N-dep.


Mark A. Sutton


Chris R. Flechard

Inst Natl Rech Agr Alimentat & Environm INRAE

Andreas Ibrom

Danmarks Tekniske Universitet (DTU)

Ute M. Skiba


Wim de Vries

Wageningen University and Research

Marcel van Oijen


David R. Cameron


Nancy B. Dise


Janne F. J. Korhonen

Helsingin Yliopisto

Nina Buchmann

Eidgenössische Technische Hochschule Zürich (ETH)

Arnaud Legout

Inst Natl Rech Agr Alimentat & Environm INRAE

David Simpson

Chalmers, Rymd-, geo- och miljövetenskap, Mikrovågs- och optisk fjärranalys

Maria J. Sanz

Universidad del Pais Vasco / Euskal Herriko Unibertsitatea

Marc Aubinet

Universite de Liège

Denis Loustau

Inst Natl Rech Agr Alimentat & Environm INRAE

Leonardo Montagnani

Free University of Bozen-Bolzano

Autonomous Prov Bolzano

Johan Neirynck

Res Inst Nat & Forest INBO

Ivan A. Janssens

Universiteit Antwerpen

Mari Pihlatie

Helsingin Yliopisto

Ralf Kiese

Karlsruher Institut für Technologie (KIT)

Jan Siemens

Justus Liebig University Giessen

Andre-Jean Francez

Université de Rennes 1

Juergen Augustin

Leibniz Ctr Agr Landscape Res ZALF

Andrej Varlagin

Russian Academy of Sciences

Janusz Olejnik


Poznan Univ Life Sci

Radoslaw Juszczak

Poznan Univ Life Sci

Mika Aurela

Finnish Meteorological Institute

Daniel Berveiller

Université Paris-Sud

Bogdan H. Chojnicki

Poznan Univ Life Sci

Ulrich Dammgen

Weststr 5

Nicolas Delpierre

Université Paris-Sud

Vesna Djuricic

Meteorol & Hydrol Serv

Julia Drewer


Eric Dufrene

Université Paris-Sud

Werner Eugster

Eidgenössische Technische Hochschule Zürich (ETH)

Yannick Fauvel

Inst Natl Rech Agr Alimentat & Environm INRAE

David Fowler


Arnoud Frumau

Nederlandse Organisatie voor toegepast-natuurwetenschappelijk onderzoek (TNO)

Andre Granier

Inst Natl Rech Agr Alimentat & Environm INRAE

Patrick Gross

Inst Natl Rech Agr Alimentat & Environm INRAE

Yannick Hamon

Inst Natl Rech Agr Alimentat & Environm INRAE

Carole Helfter


Arjan Hensen

Nederlandse Organisatie voor toegepast-natuurwetenschappelijk onderzoek (TNO)

Laszlo Horvath

Greengrass - Atmospheric Environment Expert Ltd. Fellowship

Barbara Kitzler

Fed Res & Training Ctr Forests Nat Hazards & Land

Bart Kruijt

Wageningen University and Research

Werner L. Kutsch

Integrated Carbon Observat Syst ICOS ERIC Head Of

Raquel Lobo-do-Vale

Universidade de Lisboa

Annalea Lohila

Helsingin Yliopisto

Finnish Meteorological Institute

Bernard Longdoz

Gembloux Agrobio Tech


Acad Sci

Giorgio Matteucci

Consiglio Nazionale delle Ricerche (CNR)

Marta Mitosinkova

Slovak Hydrometeorol Inst

Virginie Moreaux

Inst Natl Rech Agr Alimentat & Environm INRAE

Université Grenoble Alpes

Albrecht Neftel


Jean-Marc Ourcival

Université de Montpellier

Kim Pilegaard

Danmarks Tekniske Universitet (DTU)

Gabriel Pita

Univ Tecn Lisboa

Francisco Sanz


Jan K. Schjoerring

Köpenhamns universitet

Maria-Teresa Sebastia

Universidad De Lleida

Forest Sci & Technol Ctr Catalonia CTFC

Y. Sim Tang


Hilde Uggerud

Norsk institutt for luftforskning (NILU)

Marek Urbaniak

Poznan Univ Life Sci

Netty van Dijk


Timo Vesala

Helsingin Yliopisto

Sonja Vidic

Meteorol & Hydrol Serv

Caroline Vincke

Universite catholique de Louvain

Tamas Weidinger

Eötvös Loránd University (ELTE)

Sophie Zechmeister-Boltenstern

Universität für Bodenkultur

Klaus Butterbach-Bah

Karlsruher Institut für Technologie (KIT)

Eiko Nemitz



1726-4170 (ISSN) 1726-4189 (eISSN)

Vol. 17 6 1583-1620


Miljö- och naturvårdsvetenskap





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