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Abstract Details

(2020) Unraveling Mineral and Metabolic Controls on Soil Carbon Cycling in Redox-Dynamic Floodplain Soils

Keiluweit M & Anderson C

https://doi.org/10.46427/gold2020.1267

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10c: Room 2, Saturday 27th June 06:48 - 06:51

Listed below are questions that have been submitted by the community that the author will try and cover in their presentation. To submit a question, ensure you are signed in to the website. Authors or session conveners approve questions before they are displayed here.

Submitted by Zhuojun Zhang on Friday 26th June 04:23
Does the solution from HCl extraction contain organic matter like humic acid? If not, will this affect the results of FT ICR MS?


Submitted by Mark Stevenson on Friday 26th June 14:33
Thank you for your very detailed slides, the comparisons between redox-linked carbon cycling in flooded versus drained scenarios is very convincing. With future climate change we might anticipate changes in carbon or nutrients supplied in runoff from upstream, for example from snowpack melt or continued destabilisation of high-elevation soils. If the quality of DOC and POC supplied changes and nutrients increase (e.g. DON) over the next few decades how do you anticipate this might affect your two scenarios? Also have these catchments been influence by long-range reactive nitrogen (Nr) deposition?


Submitted by Tess Hutchinson on Saturday 27th June 03:45
Hi Marco, Very interesting work - thanks for sharing. Just a few general questions re sampling. For the depth resolved seasonal monitoring - was that via coring? And was it all 4 seasons or rather June flooded vs September drained? I also noted the data presented was from 2018 - has this been monitored for a number of years and if so, have you seen impacts of climate change i.e. increased or earlier occurring flooding? Thanks, Tess


Submitted by Macon Abernathy on Saturday 27th June 04:16
Hey Marco, What a cool study. I loved the images of the field site throughout. Here's my question: How do you expect climate change to shift the distribution of C types in these kind of montane flood plain systems/soils in the American west? Do you expect the shift in soil carbon type to differ significantly from shifts in soil carbon observed or predicted at other sites you've worked on (Oregon, California, etc)? I'd be super curious to see how manganese changes in across these systems as well.


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