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With climate change, soils are experiencing new pedoclimatic disturbances like seasonal flooding that can destabilize mineral associated organic matter (MAOM) and undermine carbon (C), nitrogen (N), and phosphorus (P) persistence. Our current understanding of how OM cycles down the soil profile is largely based on well\u2010drained soils. Thus, it remains uncertain if expected depth\u2010dependent trends and subsoil OM persistence differ in soils subjected to seasonal flooding across land uses. We collected 1\u2010m\u2010deep soil cores within a seasonal floodplain, representing a land\u2010use gradient: forest, pasture, and cropland. We compared MAOM concentrations (C, N, and P), stoichiometry, isotopic, and molecular chemical composition, in combination with microbial biomass and carbon use efficiency at four soil depths to understand the transformation and persistence of OM with depth. We found that the composition of OM by depth in our soils diverges from common trends in well\u2010drained soils. For example, in well\u2010drained soils, we expect a decrease in mineral associated C:N, and an increase in polar compounds with depth, as these compounds are thought to be more persistent. Instead, we found an increase in MAOM C:N in the forest and cropland, and an increase in non\u2010polar C rich compounds in all land uses with depth. The pasture varied from the forest and cropland, with OM composition largely unchanged with depth. Our results suggest that the extensive root system in the pasture causes desorption of older compounds resulting in younger, plant derived compounds at all depths. We propose that the controls on persistence differ in a seasonal floodplain, where MAOM persistence is shaped more by compound resistance to hydrological stress than by formation pathways.<\/jats:p>","DOI":"10.1111\/gcb.70860","type":"journal-article","created":{"date-parts":[[2026,4,17]],"date-time":"2026-04-17T11:17:02Z","timestamp":1776424622000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Seasonal Flooding Disrupts Expected Depth\u2010Dependent Patterns of Mineral Associated Carbon, Nitrogen, and Phosphorus Across Land Uses"],"prefix":"10.1111","volume":"32","author":[{"given":"Hannah P.","family":"Lieberman","sequence":"first","affiliation":[{"name":"Department of Natural Resource Sciences Macdonald Campus of McGill University  Sainte\u2010Anne\u2010de\u2010Bellevue Qu\u00e9bec Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christian","family":"von Sperber","sequence":"additional","affiliation":[{"name":"Department of Geography McGill University  Montr\u00e9al Qu\u00e9bec Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rachael","family":"Harman\u2010Denhoed","sequence":"additional","affiliation":[{"name":"Department of Natural Resource Sciences Macdonald Campus of McGill University  Sainte\u2010Anne\u2010de\u2010Bellevue Qu\u00e9bec Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A. Stuart","family":"Grandy","sequence":"additional","affiliation":[{"name":"Department of Natural Resources and the Environment University of New Hampshire  Durham New Hampshire USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cynthia M.","family":"Kallenbach","sequence":"additional","affiliation":[{"name":"Department of Natural Resource Sciences Macdonald Campus of McGill University  Sainte\u2010Anne\u2010de\u2010Bellevue Qu\u00e9bec Canada"},{"name":"Faculty of Land and Food Systems University of British Columbia  Vancouver British Columbia Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,4,17]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10705-009-9286-3"},{"key":"e_1_2_11_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.soilbio.2018.03.026"},{"key":"e_1_2_11_4_1","volume-title":"Stockholm Convention on Persistent Organic Pollutants","author":"Annex C.","year":"2008"},{"key":"e_1_2_11_5_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.abo2380"},{"key":"e_1_2_11_6_1","doi-asserted-by":"publisher","DOI":"10.1088\/1748-9326\/ab2c11"},{"key":"e_1_2_11_7_1","doi-asserted-by":"publisher","DOI":"10.1071\/SR12374"},{"key":"e_1_2_11_8_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41586-018-0328-3"},{"key":"e_1_2_11_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.orggeochem.2007.12.003"},{"key":"e_1_2_11_10_1","doi-asserted-by":"publisher","DOI":"10.1111\/gcb.17024"},{"key":"e_1_2_11_11_1","volume-title":"Rivers and Floodplains: Forms, Processes, and Sedimentary Record","author":"Bridge J. 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