Plants mediate soil organic matter decomposition in response to sea level rise

Global Change Biology
Peter MuellerJ Patrick Megonigal

Abstract

Tidal marshes have a large capacity for producing and storing organic matter, making their role in the global carbon budget disproportionate to land area. Most of the organic matter stored in these systems is in soils where it contributes 2-5 times more to surface accretion than an equal mass of minerals. Soil organic matter (SOM) sequestration is the primary process by which tidal marshes become perched high in the tidal frame, decreasing their vulnerability to accelerated relative sea level rise (RSLR). Plant growth responses to RSLR are well understood and represented in century-scale forecast models of soil surface elevation change. We understand far less about the response of SOM decomposition to accelerated RSLR. Here we quantified the effects of flooding depth and duration on SOM decomposition by exposing planted and unplanted field-based mesocosms to experimentally manipulated relative sea level over two consecutive growing seasons. SOM decomposition was quantified as CO2 efflux, with plant- and SOM-derived CO2 separated via δ(13) CO2 . Despite the dominant paradigm that decomposition rates are inversely related to flooding, SOM decomposition in the absence of plants was not sensitive to flooding depth and duration. The...Continue Reading

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Mar 19, 2013·Global Change Biology·J Adam LangleyJ Patrick Megonigal
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Citations

Mar 21, 2017·Ecological Applications : a Publication of the Ecological Society of America·Peter MuellerKai Jensen
Nov 23, 2017·Frontiers in Microbiology·Yang YangShaoshan An
Oct 26, 2016·Global Change Biology·Blanca BernalThomas J Mozdzer
Jun 27, 2018·International Archives of Occupational and Environmental Health·Evelien van ValenMirjam Sprangers
Nov 22, 2019·Global Change Biology·Marie ArnaudTai Tue Nguyen
Oct 16, 2020·Nature Communications·Peter MuellerJ Patrick Megonigal
Aug 10, 2021·Evolution Letters·Michael J BlumJeffrey D Herrick
Apr 25, 2020·The Science of the Total Environment·H TangP Mueller

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