Nitrogen deposition shows no consistent negative nor positive effect on the response of forest productivity to drought across European FLUXNET forest sites
Open Access
- 29 September 2021
- journal article
- research article
- Published by IOP Publishing in Environmental Research Communications
- Vol. 3 (12), 125003
- https://doi.org/10.1088/2515-7620/ac2b7d
Abstract
Atmospheric reactive nitrogen (N) deposition is an important driver of carbon (C) sequestration in forest ecosystems. Previous studies have focused on N-C interactions in various ecosystems; however, relatively little is known about the impact of N deposition on ecosystem C cycling during climate extremes such as droughts. With the occurrence and severity of droughts likely to be exacerbated by climate change, N deposition – drought interactions remain one of the key uncertainties in process-based models to date. This study aims to contribute to the understanding of N deposition-drought dynamics on gross primary production (GPP) in European forest ecosystems. To do so, different soil water availability indicators (Standardized Precipitation Evapotranspiration Index (SPEI), soil volumetric water) and GPP measurements from European FLUXNET forest sites were used to quantify the response of forest GPP to drought. The computed drought responses of the forest GPP to drought were linked to modelled N deposition estimates for varying edaphic, physiological, and climatic conditions. Our result showed a differential response of forest ecosystems to the drought indicators. Although all FLUXNET forest sites showed a coherent dependence of GPP on N deposition, no consistent or significant N deposition effect on the response of forest GPP to drought could be isolated. The mean response of forest GPP to drought could be predicted for forests with Pinus trees as dominant species (R2 = 0.85, RMSE = 8.1). After extracting the influence of the most prominent parameters (mean annual temperature and precipitation, forest age), however, the variability remained too large to significantly substantiate hypothesized N deposition effects. These results suggest that, while N deposition clearly affects forest productivity, N deposition is not a major nor consistent driver of forest productivity responses to drought in European forest ecosystems.Keywords
Funding Information
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek
This publication has 61 references indexed in Scilit:
- Multi-model mean nitrogen and sulfur deposition from the Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP): evaluation of historical and projected future changesAtmospheric Chemistry and Physics, 2013
- Fine root biomass and dynamics in beech forests across a precipitation gradient – is optimal resource partitioning theory applicable to water‐limited mature trees?Journal of Ecology, 2013
- Effects of Soil Water and Nitrogen on Growth and Photosynthetic Response of Manchurian Ash (Fraxinus mandshurica) Seedlings in Northeastern ChinaPLOS ONE, 2012
- Drought matters – Declining precipitation influences growth of Fagus sylvatica L. and Quercus robur L. in north-eastern GermanyForest Ecology and Management, 2011
- The impact of nitrogen deposition on carbon sequestration by European forests and heathlandsForest Ecology and Management, 2009
- Mechanisms of plant survival and mortality during drought: why do some plants survive while others succumb to drought?New Phytologist, 2008
- Simulated chronic nitrogen deposition increases carbon storage in Northern Temperate forestsGlobal Change Biology, 2007
- Reconciling Carbon-cycle Concepts, Terminology, and MethodsEcosystems, 2006
- Nitrogen and sulfur deposition on regional and global scales: A multimodel evaluationGlobal Biogeochemical Cycles, 2006
- Photosynthesis and nitrogen relationships in leaves of C3 plantsOecologia, 1989