Тип публикации: статья из журнала

Год издания: 2025

Идентификатор DOI: 10.1111/gcb.70398

Аннотация: <jats:title>ABSTRACT</jats:title><jats:p>Climate change has increased the size and frequency of wildfires across the boreal biome. Severe wildfires in boreal forests have been found to trigger shifts from evergreen to deciduous canopies, which has cascading effects on carbon and nitrogen cycling. Ecosystem productivity and carbon uПоказать полностьюptake in boreal forests are strongly linked with nitrogen, and Earth system models increasingly depend on our understanding of the nitrogen balance to predict post-fire carbon uptake. To investigate the post-fire boreal nitrogen balance, we combined a mass balance approach and literature synthesis to estimate rates of nitrogen accumulation and nitrogen inputs across a network of 18 boreal wildfire chronosequences that varied in both wildfire regime and post-fire canopy type, comprising 527 forest stands. We found that deciduous- or mixed-dominance boreal forests establishing after severe, stand-replacing fires had the highest nitrogen accumulation rates (15.7 ± 3.8 kg ha<jats:sup>−1</jats:sup> year<jats:sup>−1</jats:sup>), while evergreen-dominated forests establishing after surface- or mixed-severity fires had the lowest nitrogen accumulation rates (1.4 ± 1.1 kg ha<jats:sup>−1</jats:sup> year<jats:sup>−1</jats:sup>). Annual known inputs from nitrogen deposition and biological nitrogen fixation combined, estimated from published data, largely failed to explain the rate of nitrogen accumulation, particularly in deciduous or mixed-dominance forests establishing after stand-replacing fires, suggesting that the origins of most nitrogen in these forest types remain poorly understood. As the frequency of severe wildfires increases across the boreal biome and shifts toward deciduous canopies become more common, our study reveals a large knowledge gap in the resulting nitrogen balance that needs to be resolved in order to improve predictions of forest carbon uptake.</jats:p>

Журнал: Global Change Biology

Выпуск журнала: Т. 31, № 8

Номера страниц: 70398

ISSN журнала: 13541013

Издатель: John Wiley &amp; Sons, Incorporated

• Hupperts Stefan F. (Department of Forest Ecology and Management Swedish University of Agricultural Sciences Umeå Sweden)
• Berninger Frank (Department of Environmental and Biological Sciences University of Eastern Finland Joensuu Finland)
• Chen Han Y. H. (Institute for Global Change Biology School for Environment and Sustainability, University of Michigan Ann Arbor Michigan USA)
• Fenton Nicole (Institute for Forest Research Université du Québec en Abitibi-Témiscamingue Rouyn-Noranda Québec Canada)
• Jean Mélanie (Département de Biologie Université de Moncton Moncton New Brunswick Canada)
• Köster Kajar (Department of Environmental and Biological Sciences University of Eastern Finland Joensuu Finland)
• Larjavaara Markku (Department of Forest Sciences University of Helsinki Helsinki Finland)
• Mack Michelle C. (Department of Biological Sciences Northern Arizona University Flagstaff Arizona USA)
• Nilsson Marie-Charlotte (Department of Forest Ecology and Management Swedish University of Agricultural Sciences Umeå Sweden)
• Palviainen Marjo (Department of Forest Sciences University of Helsinki Helsinki Finland)
• Prokushkin Anatoly (V.N. Sukachev Institute of Forest SB RAS Krasnoyarsk Russia)
• Pumpanen Jukka (Department of Environmental and Biological Sciences University of Eastern Finland Kuopio Finland)
• Seedre Meelis (KappaZeta Ltd. Kastani Tartu Estonia)
• Simard Martin (Department of Geography, Centre for Forest Research Laval University Quebec City Québec Canada)
• Gundale Michael J. (Department of Forest Ecology and Management Swedish University of Agricultural Sciences Umeå Sweden)

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