MODERATE FIRE TEMPERATURES AFFECT THE STRUCTURAL DYNAMICS OF CLAYEY OXISOL AGGREGATES

MODERATE FIRE TEMPERATURES AFFECT THE STRUCTURAL DYNAMICS OF CLAYEY OXISOL AGGREGATES | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL Land Degradation & Development This is a preprint and has not been peer reviewed. Data may be preliminary. 9 July 2025 V1 Latest version Share on MODERATE FIRE TEMPERATURES AFFECT THE STRUCTURAL DYNAMICS OF CLAYEY OXISOL AGGREGATES Authors : Yasmmin Tadeu Costa 0000-0002-7050-7339 [email protected] , Paulo Angelo Fachin , Bruno Teixeira Ribeiro , Edivaldo Thomaz 0000-0003-0246-5111 , Alberto Inda 0000-0001-5252-0313 , and Nilton Curi Authors Info & Affiliations https://doi.org/10.22541/au.175203723.32584048/v1 272 views 149 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract Wildfires have become increasingly frequent and intense worldwide over the past decades, raising concerns about their impacts on soil systems. However, limited information is available on how fire-induced heating affects the structural properties of clay-rich soil aggregates, particularly those dominated by iron and aluminum oxides. The objectives of this study were to: 1) assess the effects of simulated peak fire temperatures on the structural properties of clayey Oxisol aggregates; 2) investigate the relationship between aggregate stability (AS) and tensile strength (TS) under heating; and 3) identify the main biophysical mechanisms influencing AS and TS. Six clayey Oxisols were selected, and surface samples (0–5 cm; n = 6 per soil) were collected. Soil aggregates were classified into two size fractions (12–19 mm and 4–8 mm), and the clay fraction (< 0.002 mm) was isolated for complementary analyses. A laboratory setup was used to simulate a realistic fire temperature gradient ranging from 100 °C to 600 °C. The following properties related to aggregate structural strength were evaluated: soil organic matter (SOM) content, the oxalate/dithionite-extractable Fe ratio, mineralogical and micromorphological features, aggregate stability (AS), and tensile strength (TS). A distinct temperature threshold was identified at 300 °C, corresponding to a significant reduction in SOM and TS (R 2 = 0.99), accompanied by an increase in AS. Principal component analysis (PCA) and Pearson correlation results revealed a clear distinction between TS and other soil properties. The strong positive correlation between TS and SOM suggests that the decrease in organic matter caused by heating promotes the development of microcracks within aggregates, thereby reducing TS. Supplementary Material File (manuscript.doc) Download 3.62 MB Information & Authors Information Version history V1 Version 1 09 July 2025 Copyright This work is licensed under a Non Exclusive No Reuse License. Collection Land Degradation & Development Keywords aggregate stability clayey oxisol fire-induced soil changes soil micromorphology soil mineralogy Authors Affiliations Yasmmin Tadeu Costa 0000-0002-7050-7339 [email protected] Universidade Estadual do Centro-Oeste View all articles by this author Paulo Angelo Fachin Universidade do Estado do Rio de Janeiro View all articles by this author Bruno Teixeira Ribeiro Universidade Federal de Lavras View all articles by this author Edivaldo Thomaz 0000-0003-0246-5111 Universidade Estadual do Centro-Oeste View all articles by this author Alberto Inda 0000-0001-5252-0313 Federal University of Rio Grande do Sul View all articles by this author Nilton Curi Universidade Federal de Lavras View all articles by this author Metrics & Citations Metrics Article Usage 272 views 149 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Yasmmin Tadeu Costa, Paulo Angelo Fachin, Bruno Teixeira Ribeiro, et al. MODERATE FIRE TEMPERATURES AFFECT THE STRUCTURAL DYNAMICS OF CLAYEY OXISOL AGGREGATES. Authorea . 09 July 2025. DOI: https://doi.org/10.22541/au.175203723.32584048/v1 If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download. For more information or tips please see 'Downloading to a citation manager' in the Help menu . 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