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| Open AccessNorthern expansion is not compensating for southern declines in North American boreal forests
Boreal forests are expanding at high latitudes yet declining at their southern boundaries. Here, the authors show that such trends are not symmetrical in North America, where poleward expansion of boreal forests did not offset southern declines often linked to wildfires and logging.
- Ronny Rotbarth
- , Egbert H. Van Nes
- & Milena Holmgren
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| Open AccessReassessment of growth-climate relations indicates the potential for decline across Eurasian boreal larch forests
Tree growth in boreal forests is generally predicted to increase under warming. Here, the authors demonstrate a method to analyze physiologically informed temperature series of tree-ring data, finding potentially overlooked growth-temperature responses and projecting increasing risks of warming to boreal larch forests.
- Wenqing Li
- , Rubén D. Manzanedo
- & Neil Pederson
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| Open AccessForest defoliator outbreaks alter nutrient cycling in northern waters
Defoliating insects disrupt nutrient cycling of boreal catchments by redistributing carbon and nitrogen from forests to lakes. The resulting shift in lake biogeochemistry exceeds broader between-year trends observed across the boreal and north temperate region.
- Samuel G. Woodman
- , Sacha Khoury
- & Andrew J. Tanentzap
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| Open AccessFire deficit increases wildfire risk for many communities in the Canadian boreal forest
A primary element of modern wildfire management is to aggressively suppress small fires before they become large, but benefits can be offset by the fact that these practices promote older forests that are more ‘flammable’. Here the authors show that this downside puts numerous human communities at elevated risk of fires in boreal Canada.
- Marc-André Parisien
- , Quinn E. Barber
- & Sean A. Parks
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| Open AccessPlant roots increase both decomposition and stable organic matter formation in boreal forest soil
Understanding mechanisms of soil organic matter (SOM) decomposition and stabilisation improves soil-climate feedback predictions. Here the authors show that roots in boreal forest promote organic nitrogen economy and provide a framework on how roots affect decomposition and stabilisation of SOM.
- Bartosz Adamczyk
- , Outi-Maaria Sietiö
- & Jussi Heinonsalo
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| Open AccessNorthern forest tree populations are physiologically maladapted to drought
Northern tree populations may not benefit under climate change, with implications for assisted migration and range expansion. Here, Isaac-Renton et al. show that leading-edge lodgepole pine populations have fewer characteristics of drought-tolerance, so may not adapt to tolerate drier conditions.
- Miriam Isaac-Renton
- , David Montwé
- & Kerstin Treydte
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| Open AccessWildfire as a major driver of recent permafrost thaw in boreal peatlands
Future permafrost thaw may be underestimated unless effects of wildfire are considered. Here the authors show that wildfires in boreal permafrost peatlands influence soil temperature and seasonal thaw depth for several decades, and increase the rate of complete permafrost thaw along permafrost edges.
- Carolyn M. Gibson
- , Laura E. Chasmer
- & David Olefeldt
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| Open AccessLandscape topography structures the soil microbiome in arctic polygonal tundra
The role of ecosystem structure in microbial activity related to greenhouse gas production is poorly understood. Here, Taş and colleagues show that microbial communities and ecosystem function vary across fine-scale topography in a polygonal tundra.
- Neslihan Taş
- , Emmanuel Prestat
- & Janet K. Jansson
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Differentiating moss from higher plants is critical in studying the carbon cycle of the boreal biome
Satellite-derived indices used to estimate gross primary production and carbon cycling rarely differentiate between boreal mosses and vascular plants, despite differences in photosynthetic capacity. Here, the authors show that this may have led to an overestimation of the boreal carbon budget.
- Wenping Yuan
- , Shuguang Liu
- & Timo Vesala
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Increases in terrestrially derived carbon stimulate organic carbon processing and CO2 emissions in boreal aquatic ecosystems
Recent increases in the dissolved organic carbon (DOC) content of northern aquatic systems are likely to lead to increases in CO2 emissions, yet the mechanisms are poorly understood. Here, evidence from hundreds of Canadian aquatic systems suggests a causal link between DOC concentrations and CO2flux.
- Jean-François Lapierre
- , François Guillemette
- & Paul A. del Giorgio