Soil Biogeochemistry @ UNIL

@keiluweitlab.bsky.social

We are curious how interactions among organic matter, microbes, and minerals in soil drive and respond to climate change | PI: Marco Keiluweit | This account shares updates and news from the team | University of Lausanne 🇨🇭| https://wp.unil.ch/bgc

Who wants to know how plant roots and microbes conspire to induce anoxic microsites in the rhizosphere? Check out @soiltycoon.bsky.social's latest paper in New Phytologist! lnkd.in/eCwxkwT2. THANKS to G Ceriotti, P De Anna, S. Borisov, J Berg, D Garrido-Sanz, C Keel, the NCCR Microbiomes and SNF.

New Phytologist@newphyt.bsky.social · 5mo ago

Root and microbial contributions to anoxic microsite formation in the rhizosphere: a microfluidic approach Lacroix et al. @soiltycoon.bsky.social @keiluweitlab.bsky.social nph.onlinelibrary.wiley.com/doi/10.1111/...

Diagram and photos of microfluidic device.

We're super excited about my @unil.bsky.social colleague @pbenettin.bsky.social 's new Ecotrons! Fully climate controlled soil lysimeters! So many possibilities for manipulations and experiments!

Paolo Benettin@pbenettin.bsky.social · last yr.

The new Ecotron system manufactured by UGT and funded by the UNIL Faculty of Geoscience and the Environment @fgse-unil.bsky.social is operational! It's a rather big machine with a very big potential for ecohydrological experimentation.

It's timely that I re-post a tweet from July, 2022 (if you know why, you know), which I made soon after I left my first postdoc. Many empathized with me then and still do today. *the original tweet is gone b/c I quit Twitter, but it has been archived elsewhere: www.instagram.com/p/CgCRxO5OIG...

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Three years ago, I wrote this rapid ramble of a blog, "The kids are not ok", following my experience of a failed climate lecture. It remains the most read piece I have ever written. I just looked at it again: I can see why. It's ... just honest. jksteinberger.medium.com/the-kids-are...

The kids are not ok

Today I went to give a climate talk at my old high school in Geneva — and was given a masterclass in our failings. This is the story of a…

jksteinberger.medium.com

🚨 Always wanted to take a closer 👀 at mineral-organic interfaces in #soils? Then check out Floriane Jamoteau's new paper on the promises and challenges of photothermal IR microscopy to resolved interactions among microbes, minerals, and organics at sub-micron scales. pubs.acs.org/doi/10.1021/...

Probing Mineral-Organic Interfaces in Soils and Sediments Using Optical Photothermal Infrared Microscopy

Interactions among microbes, minerals, and organic matter are key controls on carbon, nutrient, and contaminant dynamics in soils and sediments. However, probing these interactions at relevant scales and through time remains an analytical challenge due to both their complex nature and the need for tools permitting nondestructive and real-time analysis at sufficient spatial resolution. Here, we demonstrate the ability and provide analytical recommendations for the submicron-scale characterization of complex mineral-organic microstructures using optical photothermal infrared (O-PTIR) microscopy. Compared to conventional infrared techniques, O-PTIR spectra collected at submicron resolution of environmentally relevant mineral and organic reference compounds demonstrated similar spectral quality and sensitivity. O-PTIR detection sensitivity was greatest for highly crystalline minerals and potentially for low molecular weight organic compounds. Due to photothermal effects, O-PTIR was more sensitive toward organics than minerals compared to conventional IR approaches, even when organics were mineral-bound. Moreover, O-PTIR resolved mineral-bound and unbound organics in a complex mixture at submicron (<500 nm) resolution. Finally, we provide best practices for artifact-free analysis of organic and mineral samples by determining the appropriate laser power using damage thresholds. Our results highlight the potential of O-PTIR microscopy for nondestructive and time-resolved analysis of dynamic microbe-mineral-organic matter interactions in soils and sediments.

pubs.acs.org