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Christina Hackmann

@christina-hn.bsky.social
562 followers 499 following 41 posts

Curious about trees, water, ecophysiology, stable isotopes, species interactions, dataviz & fieldwork food. Postdoctoral researcher at Göttingen University DE, part of @enricounigoe.bsky.social and @foreslab.bsky.social

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Reposted by Christina Hackmann
Global Dendrometer Network @globaldendro.bsky.social · 04/09/2026
Would you like to help shape the future of the Global Dendrometer Network? Get involved! We are looking to expand our steering group. Join for an informal info & planning session: ⏰Thu, 10 Sep 2026, 10:00 CEST Researchers from all regions & career stages are welcome. No link yet? Contact us!
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Reposted by Christina Hackmann
Global Dendrometer Network @globaldendro.bsky.social · 04/09/2026
We got so many submissions for the metadata call, it is just amazing. 🎉 Following this milestone, our next GDN community meeting is coming up: 📆Mon, 14 Sep 2026 🕐13h CEST Let's take a first look at our map and discuss network initiatives, priorities and opportunities. No link yet? Contact us.
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Christina Hackmann @christina-hn.bsky.social · 19/08/2026
Students and early career researchers in forest science: The EnriCo project is organizing its Final Symposium and we invite you to join us in Göttingen. It's free, it's interdisciplinary, and your opportunity to share your research and chat about trees. Send your abstract by 1 Sep! 🍁 #forestecol
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Christina Hackmann @christina-hn.bsky.social · 22/07/2026
Yay! Our new commentary is now out in Tree Physiology:
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Christina Hackmann @christina-hn.bsky.social · 25/06/2026
Along with the heat wave, here comes our new study on tree drought response: Douglas fir vs. Beech 🔥 Results: 🌳 They differ :) 💧 But there is one general pattern: Transpiration & capacitance may decline, but stem rehydration is maintained. #dendrometer #sapflow Read: doi.org/10.1016/j.ag...
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Global Dendrometer Network @globaldendro.bsky.social · 27/05/2026
Hi #dendrometer community, our next meeting will take place on Friday at 10am! On the agenda: 🌍 ongoing metadata call 🆕 network updates 👥 community input Join us via the circulated meeting link, or drop us a message if you want to join, but are not yet part of the mailing list. See you on Friday!
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Denise Horoky @fadedbleujeans.bsky.social · 02/04/2026
Along with that new growth, a UBC Okanagan researcher, Dr. Magali Nehemy, has determined that some trees in spring also provide simple, visual clues--raised or lowered branches--to indicate that they are rehydrating or water-stressed. www.castanet.net/news/Campus-...
By using high-resolution sensors on a tree's stems and time-lapse photography, UBC Okanagan researchers can watch for the visual clues some trees present when water stressed.

With the arrival of spring a few weeks ago, new buds and colours on the trees started to appear.

Along with that new growth, a UBC Okanagan researcher has determined that some trees in spring also provide simple, visual clues--raised or lowered branches--to indicate that they are rehydrating or water-stressed.

Dr. Magali Nehemy studies forest hydrology with UBCO's Department of Earth and Environmental Science in the Irving K. Barber Faculty of Science. Her latest paper, published in Hydrological Processes, examined how tree branches shift as they start to rehydrate when winter ends.

"Spring rehydration is one of the key transitions in forest ecosystems," says Dr. Nehemy. "It marks the moment when trees begin to restore internal water reserves and prepare for the growing season."

Using high-resolution sensors on the tree's stems and time-lapse photography, the researchers recorded branch movements of balsam fir while the trees rehydrated during snowmelt and rainfall events. During drier periods, the branches gradually drooped downward, indicating a deficit in the tree's water.

The study took place from early March to mid-May on a grove of balsam fir in Ontario's Muskoka region.
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Reposted by Christina Hackmann
Global Dendrometer Network @globaldendro.bsky.social · 06/05/2026
A successful meeting at #EGU26 conference! Thank you everyone for joining and contributing your experiences and ideas. We have proudly launched our website: globaldendro.org, including the global metadata call targeting all #dendrometer users. Check it out and spread the word 🌐
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New Phytologist @newphyt.bsky.social · 06/05/2026
Continuous plant water potential: best practices and key challenges Restrepo-Acevedo et al. @christina-hn.bsky.social nph.onlinelibrary.wiley.com/share/B2K3H7...
Integrating continuous plant water potential measurements with remote sensing observations across scales.
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Global Dendrometer Network @globaldendro.bsky.social · 01/05/2026
Come join the Global Dendrometer Network at #EGU26! We are looking forward to our in-person meeting: Tue, 5 May ⏰16:15-18h 📍Room 2.61 There will be updates, short talks, and the launch of our greatest initiative so far 🚀🌱 See you in Vienna! webforms.copernicus.org/EGU26/splint... ▶️SPM40
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EGU Biogeosciences Division (BG) @egubg.bsky.social · 01/05/2026
🎉 Anne Klosterhalfen received the 2026 BG's Outstanding Early-Career Scientist Award! We warmly celebrate this well-deserved recognition 👏 We spoke with Anne about her scientific journey and research contributions hoping to inspire the next generation of biogeoscientists 🌱 👉 tinyurl.com/bgak2026
tinyurl.com
Meet Anne Klosterhalfen, the Outstanding Early Career Scientist awardee of the Biogeosciences Division!
This year, Anne Klosterhalfen has received the Biogeosciences Division’s Outstanding Early-Career Scientist Award. The BG team warmly celebrates this well-deserved recognition! We talked to her about…
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Biodiversity Exploratories @bexplo.bsky.social · 24/04/2026
🚨 New BE paper on #forest #microclimates!🌲 Across 11 years and 149 plots in Germany, variability was driven mainly by precipitation and outside temperatures -not by low- to medium-intensity timber harvest. #Climate extremes may pose the greatest #biodiversity risk.🌐 link.springer.com/article/10.1...
link.springer.com
Impacts of forest management on the inter-annual variability of forest microclimate - European Journal of Forest Research
The microclimatic conditions within forests have great importance for biodiversity and ecosystem functioning. Consequently, understanding how management and associated changes in forest structure driv...
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Reposted by Christina Hackmann
Global Dendrometer Network @globaldendro.bsky.social · 24/04/2026
Hello world! This is the Global Dendrometer Network 🌍. We have been founded by the growing community of researchers and practitioners working with high-resolution tree diameter measurements: from microscopic movements to forest-scale insights. 🌳 Join our mailing list here: forms.gle/ETPuNVCH7x89...
forms.gle
Global Dendrometer Network Mailing List
Please fill out this form if you wish to be added to a mailing list regarding the Global Dendrometer Network. By signing up, this does not commit you to anything other than receiving updates about fut...
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Nadine Ruehr @nadineruehr.bsky.social · 16/04/2026
🌲🌳 PhD opportunity: Forest Vulnerability to Hotter Droughts Interested in forest ecosystems, climate extremes & tree stress resilience? 🎓 Dual PhD (KIT 🇩🇪 + Melbourne 🇦🇺) 🔬 Plant Ecophysiology Lab, Garmisch-Partenkirchen 🇩🇪 🌍 +1-year research stay 🇦🇺 👉 Apply here: t1p.de/g39co
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Uni Göttingen @uni-goettingen.de · 16/04/2026
Duell im Blätterdach 🌳 Ist der Baum gestresst? Fehlen ihm Nährstoffe? Woher nimmt er Wasser? Proben aus der Baumkrone helfen Forschenden, den Zustand unserer Wälder zu erkennen. Doch wie kommt man am besten dran: Klettern oder per Drohne? Video: www.youtube.com/watch?v=CSGO... @tu-braunschweig.de
Kletterteam der Uni Göttingen beim „Forschungsduell im Blätterdach“: Waldökologin Christina Hackmann (rechts) und Pflanzenökophysiologe Sharath Paligi (links)
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Christina Hackmann @christina-hn.bsky.social · 13/04/2026
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Christina Hackmann @christina-hn.bsky.social · 13/04/2026
🌳🔬 Forschungsduell im Blätterdach: Wer gewinnt das Duell um die Krone? Wasserstress, Nährstoffhaushalt, und mehr - Proben aus der Baumkrone helfen uns, den Zustand unserer Wälder zu verstehen. Aber wie kommt man an die Proben? Teaser hier, ganzer Film auf YouTube: youtu.be/CSGO046Ahqo
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Simon Haberstroh @simonhaber.bsky.social · 30/03/2026
Job alert: We are looking for a highly motivated doctoral researcher in our CRC @ecosense-sfb-1537.bsky.social to investigate water potential dynamics and water fluxes across the soil-plant-atmosphere continuum 🌳🌲☀️🌧️ Come and join our team @chriswernerlab.bsky.social uni-freiburg.de/stellenangeb...
uni-freiburg.de
Universität Freiburg
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Christina Hackmann @christina-hn.bsky.social · 10/02/2026
The highlights of our new study summarized as a press release! ⚠️ This is what can happen if two PhD students decide they have not yet had enough and want to do collaborative research. Worth it! @mrakklara.bsky.social @sharathpaligi.bsky.social @wileyecology.bsky.social
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New Phytologist @newphyt.bsky.social · 28/01/2026
✨ Paper spotlight ✨ (🧵 1/7) From growth potential to drought survival: a trait- and time-based framework for plant water economics across vascular species nph.onlinelibrary.wiley.com/doi/10.1111/...
Fig. 6 Hypothesized trade-offs across vascular species illustrating a water use economics framework.
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Simon Hammann @simonhammann.bsky.social · 08/01/2026
DFG erlaubt Einsatz von KI in der Begutachtung. Wenn wir jetzt noch die AI dazu kriegen, die komplette Forschung zu machen, haben wir den Menschen komplett von der Last des Forschungsprozzeses befreit und er kann sich komplett auf wichtige Dinge wie Reisekostenerstattungsanträge konzentrieren.
dfg.de
Künstliche Intelligenz in der Begutachtung
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Christina Hackmann @christina-hn.bsky.social · 18/12/2025
Our new paper is out, involving some tree climbing and dual #isotope tracing:
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EnriCo - Uni Goettingen @enricounigoe.bsky.social · 18/11/2025
Don't miss our upcoming mini-conference! 🌍🌱 Join us for "Linking biodiversity, functions, and climate: Insights from global ecosystems" on 1st December from 11am – 4pm at F01, Busenweg 1, North Campus. Registration: www.uni-goettingen.de/en/581694.html #EnriCo #miniconference
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EnriCo - Uni Goettingen @enricounigoe.bsky.social · 08/10/2025
Rainy day fieldwork just got significantly cuter (and tastier sounding!) 🐭! Micaela is out battling the soggy conditions today and looks like she's already found a star: the Edible Dormouse (glis glis)! Don't worry, we're just collecting data, not dinner🌧️ #EnriCo #EdibleDormouse
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Christina Hackmann @christina-hn.bsky.social · 16/10/2025
Thanks for having us! Had some great exchange and inspiration by fellow #dendrometer nerds, and my most expensive beer ever in the beautiful city of Oslo. It was definitely worth it.
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Christina Hackmann @christina-hn.bsky.social · 12/10/2025
Travelling to Norway to see what @daniellecreek.bsky.social & colleagues are up to. Turns out changing trains in Malmö at 6am is not as bad as it sounds
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Christina Hackmann @christina-hn.bsky.social · 07/10/2025
Great meeting, and impressive field site in the Black Forest 🌳
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Christina Hackmann @christina-hn.bsky.social · 25/09/2025
Fun to be part of this #SciComm initiative on #Forest #Resilience!
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Reposted by Christina Hackmann
Michela Audisio @michela-audisio.bsky.social · 23/09/2025
Saturday we @enricounigoe.bsky.social went into the forest for our outreach project “Forest Resilience: Science and Practice”. We showed how scientists study forests — from soil to canopy — to supports climate-resilient forest management. Learn more: www.uni-goettingen.de/de/701003.html
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Christina Hackmann @christina-hn.bsky.social · 19/09/2025
Colorful encounters during fieldwork. Beech leaves are still green, but #FungiFriends are out getting ready for autumn 🍃🍄
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Antoine Cabon @acabon.bsky.social · 05/09/2025
🌳 New Tansley Insight! What really limits tree growth—carbon source or sink? 🤔 I argue it’s not either/or but a distal → proximal continuum: from photosynthesis to transport and cell division, drivers act together to shape C allocation & growth 🌱🌍 🔗 nph.onlinelibrary.wiley.com/doi/10.1111/nph.70516
nph.onlinelibrary.wiley.com
Distal to proximal: a continuum of drivers shaping tree growth and carbon partitioning
The relationship between tree carbon (C) assimilation and growth is central to understanding tree functioning and forecasting forest C sequestration, yet remains unresolved. The long-standing debate ...
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Uni Göttingen @uni-goettingen.de · 05/09/2025
Exkursion (kostenlos) für alle Interessierten – auch mit Kindern: Wie untersuchen Forschende Wälder im Kontext des Klimawandels? Beim Spaziergang im Göttinger Wald geben sie am 20.9. spannende Einblicke – Mitmachaktionen & Picknick inklusive. Bis 15.9. anmelden: www.uni-goettingen.de/de/701004.html
Plakat der Aktion mit dem Titel „Waldexkursion. Resilienz der Wälder: Wissenschaft und Praxis“ mit folgenden Informationen: Datum: 20. September 2025, Standort: Göttinger Wald, Uhrzeit: 10 bis 13 Uhr, Treffpunkt: Experimenteller Botanischer Garten (Grisebachstraße 1 in 37077 Göttingen), Shuttlebus vom Bahnhof auf Anfrage verfügbar, Programmpunkte: 1. Spaziergang im Wald: aus nächster Nähe erfahren, wie Forschende Wälder im Kontext des Klimawandels untersuchen, 2. Forschende treffen: Picknick mit Brötchen, Getränken und gemütlichem Austausch mit Expert*innen; kostenlose Anmeldung bis zum 15. September, Fragen und weitere Informationen per Mail: michela.audisio@uni-goettingen.dePlakat mit den beteiligten Forschenden: Rebecca Schwutke, Christina Hackmann, Klara Mrak, Thalea Stuckenberg und Michela Audisio
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Nordic Society Oikos @nordicoikos.bsky.social · 03/09/2025
Got inspired by all the fantastic research at #gfoe2025? Save the date for an even larger gathering of excellence in #ecology and #evolution at the joint #NSO2026 and #gfoe2026 meeting with @gfoesoc.bsky.social! See you on 14-17 Sep 2026 in Denmark! nordicsocietyoikos.glueup.com/event/nordic...
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Christina Hackmann @christina-hn.bsky.social · 02/09/2025
Amazing start of #gfoe2025 yesterday with the Orchester des Wandels and @jan-haft.bsky.social. Today there are many interesting sessions again, among them Forest Dynamics under pressure (Room 0.002), where you will find me this afternoon:
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Michela Audisio @michela-audisio.bsky.social · 23/08/2025
Pleased to invite you to the online seminar series "Forest Resilience: Science and Practice" by the #CompetenceCentreLandscapeResilience. We'll hear about exiting research and inspiring insights from the experts career journeys 🧭🌳🌲 🗓 Program & registration: www.uni-goettingen.de/de/701005.html
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Christina Hackmann @christina-hn.bsky.social · 25/08/2025
Was macht Wälder resilient und wie funktioniert ein Baum überhaupt? Im September sind die Deutschen #Waldtage2025. Passend dazu organisieren wir am 20.9. eine Exkursion für alle, die sich für Bäume und Waldforschung interessieren - vor der Haustür unseres Campus in #Göttingen.
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Christina Hackmann @christina-hn.bsky.social · 25/08/2025
Congratulations Dr. Sharath Paligi!
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Christina Hackmann @christina-hn.bsky.social · 17/07/2025
I successfully defended my PhD on tree-water relations in pure and mixed forests this week! Still slightly overwhelmed, honored, and motivated to keep the research going. A big thank you to my supervisor Christian Ammer, the EnriCo colleagues, and everyone else involved in this journey. #PhDone
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Uni Göttingen @uni-goettingen.de · 24/06/2025
Der #Wald wird im #Klimawandel trockener. Gerade im Oberboden wird das #Wasser knapp. Welche Bäume wachsen so noch gut, und machen Mischwälder einen Unterschied? An Fichte, Buche und Douglasie haben Forschende untersucht, woher die Bäume ihr Wasser holen. Mehr: www.uni-goettingen.de/de/3240.html...
Wasser, das mit schweren Isotopen markiert wurde, wird über eine Röhre in tiefere Bodenschichten geleitet. Wenn die Bäume von dort Wasser aufnehmen, kann man die Markierung im Baum wiederfinden. (Copyright: Christina Hackmann)
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Christina Hackmann @christina-hn.bsky.social · 23/06/2025
Excited to see the next chapter of my PhD published in #PlantBiology: doi.org/10.1111/plb.... Another piece in the puzzle of tree-water relations and mixed-species forests! @plantsciencedbg.bsky.social @enricounigoe.bsky.social #openaccess #isotopes 🍁
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Uni Göttingen @uni-goettingen.de · 19/06/2025
🚩 Nacht des Wissens – am Samstag, 21. Juni, ist es soweit! Auf unserem Campus und verteilt über die Stadt laden faszinierende Themen Groß und Klein zum Entdecken ein. Programm: www.goettinger-nacht-des-wissens.de/komplett/ Für einige Veranstaltungen ist eine Anmeldung nötig. @ndw-goe.bsky.social
Auge eines Uhus in Nahaufnahme
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Christina Hackmann @christina-hn.bsky.social · 13/06/2025
New paper by @pmittelman.bsky.social, assessing small mammal diversity - in the tree canopy! Happy to see these results after having a lot of fun installing the cameras 🌳🧗🏽‍♀️
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Christina Hackmann @christina-hn.bsky.social · 09/06/2025
What a great fieldwork crew here at @turkeylakes.bsky.social! (Bugs not included :D) I'm lucky to visit Magali Nehemy's lab @trentuniversity.bsky.social 🇨🇦, getting new insights & exchanging about #ecohydrology #ecophysiology Thanks to the team! @daniellehudson.bsky.social @mdimitro.bsky.social
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Danielle Creek @daniellecreek.bsky.social · 27/05/2025
🪧Calling all researchers working with #dendrometers. The #NordicDendroNetwork is holding its first meeting 13-15 October in Norway. For more information and registration go to >>> shorturl.at/HqoFY
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Christina Hackmann @christina-hn.bsky.social · 02/06/2025
What is happening in the forests of Lower Saxony? Last week's fieldwork in a nutshell 🌳🧑‍🔧👷‍♀️🍁 #sapflow #dendrometer @foreslab.bsky.social @zkfniedersachsen.bsky.social @unigoettingen.bsky.social
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ROOT-SHOOT RCN @root-shoot.bsky.social · 24/04/2025
Join us for an exciting Student Symposium workshop featuring Molly Edwards, PhD @science-irl.bsky.social. It's an interactive workshop on science communication, focused on short-form video production. May 13th 11am EDT. More information & registration link here rootandshoot.org/planting-the...
Planting the Seeds of Change: Communicating Science with Purpose.  An online student-led symposium series, featuring Dr. Molly Edwards. We’ll discuss best practices for short-form video production, explore different formats and approaches, and workshop your own ideas for videos. You’ll come away with actionable steps for producing your own video that stands up for science, and we plan to stay in touch after the workshop ends to help each other amplify our videos when they come out. 
May 13th, 8-9am PDT / 11am - noon EDT. Open to all, come be a part of it!
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Christina Hackmann @christina-hn.bsky.social · 07/05/2025
Staying connected with our colleagues & collaborators. Yesterday Göttingen forest was the place to be :)
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ECOSENSE @ecosense-sfb-1537.bsky.social · 01/04/2025
Pre-register now for our international #ECOSENSE Conference from 29.09.-01.10.2025, bringing together environmental scientists and engineers! Visit our conference website for details and apply for one of the limited spaces. 1/2 uni-freiburg.de/ecosense/eco... #forest #ClimateChange #DFG
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Luca Smekal @lucamotive.bsky.social · 02/05/2025
Ending #EGU25 like it began, sharing a drink with @christina-hn.bsky.social ✨
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FoResLab @foreslab.bsky.social · 29/04/2025
Alexander Knohl (University of Göttingen), Spokesperson of FoResLab, just presented FoResLab at #EGU25 in Vienna.💡 www.egu25.eu #forestresilience
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