Data-driven quantification of nitrogen enrichment impact on Northern Hemisphere plant biomass

18128 6 98374 2 302426 document 98374 Liu_2022_Environ._Res._Lett._17_074032.pdf application/pdf b89c388b9ba5531939390cb7be58bd70 MD5 2400549 2022-07-26 05:59:46 https://pure.iiasa.ac.at/id/eprint/18128/1/Liu_2022_Environ._Res._Lett._17_074032.pdf 18128 1 1 application/pdf text en public cc_by_4

Liu_2022_Environ._Res._Lett._17_074032.pdf

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http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/98374 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/98374 http://eprints.org/relation/issmallThumbnailVersionOf https://pure.iiasa.ac.at/id/document/98374 archive 353 disk0/00/01/81/28 2022-07-26 06:02:56 2022-07-26 06:02:56 2022-07-26 06:02:56 article show Liu Y. Piao S. Makowski D. Ciais P. Gasser T. 2136 0000-0003-4882-2647 Song J. Wan S. Peñuelas J. Janssens I. Data-driven quantification of nitrogen enrichment impact on Northern Hemisphere plant biomass pub ASA EM ECE IACC carbon cycle; ecosystem process model; field experiment; machine-learning; nitrogen deposition Indexed keywords Metrics Funding details Abstract The production of anthropogenic reactive nitrogen (N) has grown so much in the last century that quantifying the effect of N enrichment on plant growth has become a central question for carbon (C) cycle research. Numerous field experiments generally found that N enrichment increased site-scale plant biomass, although the magnitude of the response and sign varied across experiments. We quantified the response of terrestrial natural vegetation biomass to N enrichment in the Northern Hemisphere (>30° N) by scaling up data from 773 field observations (142 sites) of the response of biomass to N enrichment using machine-learning algorithms. N enrichment had a significant and nonlinear effect on aboveground biomass (AGB), but a marginal effect on belowground biomass. The most influential variables on the AGB response were the amount of N applied, mean biomass before the experiment, the treatment duration and soil phosphorus availability. From the machine learning models, we found that N enrichment due to increased atmospheric N deposition during 1993-2010 has enhanced total biomass by 1.1 ± 0.3 Pg C, in absence of losses from harvest and disturbances. The largest effect of N enrichment on plant growth occurred in northeastern Asia, where N deposition markedly increased. These estimates were similar to the range of values provided by state-of-the-art C-N ecosystem process models. This work provides data-driven insights into hemisphere-scale N enrichment effect on plant biomass growth, which allows to constrain the terrestrial ecosystem process model used to predict future terrestrial C storage. 2022-07-06 published Institute of Physics Publishing (IOP) doi:10.1088/1748-9326/ac7b38 2885 public Environmental Research Letters 17 7 e074032 TRUE 1748-9326 Effects of phosphorus limitations on Life, Earth system and Society (IMBALANCE-P, FP7 610028) yes info:eu-repo/grantAgreement/EC/FP7/610028/EU//IMBALANCE-P info:eu-repo/semantics/article info:eu-repo/semantics/openAccess