Stefan Hupperts 🌲🍄

Rising atmospheric CO2 reduces nitrogen availability in boreal forests - Nature Nitrogen isotope tree-ring chronologies show that rising atmospheric CO2 has reduced nitrogen availability in boreal forests in Sweden, suggesting that elevated atmospheric CO2 is causing oligotrophication in boreal forests.

Nature research paper: Rising atmospheric CO2 reduces nitrogen availability in boreal forests

go.nature.com/3Op1Hca

Rising atmospheric CO2 reduces nitrogen availability in boreal forests - Nature Nitrogen isotope tree-ring chronologies show that rising atmospheric CO2 has reduced nitrogen availability in boreal forests in Sweden, suggesting that elevated atmospheric CO2 is causing oligotrophic...

I am really excited to share our new paper, published today in Nature. We show that rising atmospheric CO2 is linked to decling nutrient availability in boreal forest, with implications for the future carbon sink. Kudos to lead author @kelleyrbassett.bsky.social.
www.nature.com/articles/s41...

Rising CO2 is reducing nitrogen availability in boreal forests. Check out our new paper in Nature, led by @kelleyrbassett.bsky.social! 👇

Post doctor (3 years) within mountain plant community and ecosystem processes across a globally distributed experiment

Great postdoc opportunity in Sweden!! With the one and only David Wardle 🧪🌐
www.umu.se/en/work-with...

People Over Papers - Report ICE Activity Report and track ICE activity in your community. A community-driven platform to document immigration enforcement.

Please spread widely!!! The whole world needs to see this, especially communities in the USA.

iceout.org

Boreal forest stream running through the forest. Temperature logger, leaf litter collection basket, and pitfall trap in the foreground.

I'm recruiting a #PhDstudent ! Deadline Feb 10th!

Explore how forest management shapes peatlands, riparian zones, streams and the #biodiversity that depends on them. www.slu.se/en/about-slu...

👇👇

Explore how soil food webs withstand droughts and heatwaves, and what this means for tree regeneration in Swedish forests! 🌲🪱🌳🍄Become a PhD student in the WIFORCE Research School and work with us at SLU-Uppsala @mycopat.bsky.social #climate #forest #microbes #nematodes

www.slu.se/en/about-slu...

New paper alert: Overestimated natural biological nitrogen fixation translates to an exaggerated CO2 fertilization effect in Earth System Models. Outstanding work by lead author Sian Kou-Giesbrecht
👇👇👇👇👇👇

www.pnas.org/doi/10.1073/...

Whole‐seedling trait adjustments of mountain birch under contrasting environmental conditions Warming temperatures can promote arctic tree seedling establishment and growth, but these effects depend on the environmental context and the seedlings' capacity to acquire limiting resources. Here, ....

Check out our new paper about birch seedlings, traits, nutrient acquisition and warming in subarctics! 👀⚠️🌳 Just now coming out in Oikos :)
doi.org/10.1002/oik....
Many thanks to Maja Sundqvist and the whole amazing team 🤩
@stefhupperts.bsky.social
@michael-gundale.bsky.social
@aclassen.bsky.social

Lots to learn from this scrappy little tree 😂

A Meta‐Regression of 18 Wildfire Chronosequences Reveals Key Environmental Drivers and Knowledge Gaps in the Boreal Nitrogen Balance

🔗 buff.ly/IgjGnD0
@stefhupperts.bsky.social @michael-gundale.bsky.social

I had a few people at #ESA2025 say that it was hard to find where to apply for jobs in Sweden. If you want to check jobs at university, here's the website: www.slu.se/en/about-slu...

#forests #restorationecology #forestry #silviculture

Not from the EU and looking to come to Sweden to do reseach? There is a grant for that! Applications taken through December 2025. www.vr.se/english/appl...

It's quickly growing on me!

Currently doing field work in interior Alaska, where black spruce reigns supreme 👑

Thanks Malin!

Thanks!! We’re currently trying to solve those cliffhangers 😅

Thanks to a great team of co-authors for your patience and contributions during this paper’s journey!

Are there other sources of N fixation? Are trees accessing N from deep mineral soil or bedrock? How will changing climate and wildfire regimes affect these other N sources and N accumulation rates??

But known inputs fell far short of accumulation rates - especially in deciduous and mixed-dominance forests after stand-replacing fires, where 65-94% of the N was unexplained by known N inputs!

We estimated nitrogen accumulation rates in boreal forests across the biome, and compared accumulation rates to known N inputs from N deposition and biological N fixation. If inputs matched accumulation rates, then we would have a balanced N budget.

I'm so excited to share our new paper in Global Change Biology: A network of 18 wildfire chronosequences reveals key environmental drivers and knowledge gaps in the boreal nitrogen balance, with @michael-gundale.bsky.social and others. doi.org/10.1111/gcb....

Are you in the USA, interesting in greater stability, and looking for a postdoc with excellent funding? Write me to discuss this opportunity to come to Austria under the APART-USA program from the Austrian Academy of Sciences and Uni Wien.

stipendien.oeaw.ac.at/en/fellowshi...

People relaxing in a sunny green park with shade from large deciduous trees.

In beautiful Vienna for #EGU25! Looking forward to a fun week. Check out my poster on Wednesday morning for some boreal nitrogen excitement 🌳🌲

Graphical abstract of a scientific paper showing drawings of a helicopter fertilizing a forest, a harvester cutting down a tree and a tree stump next to a pine sapling with ectomycorrhizal fungi on its roots. In a 2 panel figure data on the organic layer carbon stock in fertilized and unfertilized forests is shown. In the left panel right after clearcutting, where there is a larger carbon stock in the previously fertilized clearcuts. In the right panel 4-13 years after clearcutting, when there is no longer a significant difference in soil organic layer carbon stocks.

New paper out in @jappliedecology.bsky.social ! We studied carry-over effects of nitrogen fertilization in Swedish production forests. 🌲🧪🌍
🧵(1/7)
besjournals.onlinelibrary.wiley.com/doi/10.1111/...

Distinct foliar fungal communities in Pinus contorta across native and introduced ranges: evidence for context dependency of pathogen release - Scientific Reports Scientific Reports - Distinct foliar fungal communities in Pinus contorta across native and introduced ranges: evidence for context dependency of pathogen release

New paper alert. We compared foliar fungal communities in native and introduced populations for a pine species (Spoiler alert: fewer pathogens in exotic populations). Shout out to an excellent international network of collaborators. 👇👇👇

www.nature.com/articles/s41...

Social card. Background image is a stock photo of a wildfire with smoke. The Canadian Journal of Forest Research logo is overlaid. Text: Changing wildfire regimes, their impacts, and the path forward.

The 2023 wildfire season was unlike anything Canada had seen before. What drove such extreme fire activity, and what can we learn for the future? A new CJFR collection explores these questions through expert perspectives and key research ▶️ ow.ly/2QFL50UY6ti

Check the add below for an exciting PhD opportunity! FYI, Sweden is a great place for PhD studies (full workers rights!) and less chaotic than some other places at the moment.

Fertilizing an aspen forest with nitrogen for 13 years has little detectable effect on fungal tissue in soil Stefan F. Hupperts, Jean C. Rodriguez-Ramos, Guncha Ishangulyyeva, Josh Wasyliw, Joseph D. Birch, James Franklin, Jin-Hyeob Kwak, Scott X. Chang, Nadir Erbilgin, Justine Karst This is a plain langu…

📰Published📰 Fertilizing an aspen forest with nitrogen for 13 years has little detectable effect on fungal tissue in soil

https://buff.ly/4aekIVq

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