Enhancement of the Formation and Stability of Iron-Bound Organic Carbon in Saline-alkali soils through Soil Improvement and Its Potential Mechanisms

Enhancement of the Formation and Stability of Iron-Bound Organic Carbon in Saline-alkali soils through Soil Improvement and Its Potential Mechanisms | 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 Search Search ADVANCED SEARCH SCROLL This is a preprint and has not been peer reviewed. Data may be preliminary. 23 June 2025 V1 Latest version Share on Enhancement of the Formation and Stability of Iron-Bound Organic Carbon in Saline-alkali soils through Soil Improvement and Its Potential Mechanisms Authors : Shuhan Wang , Biao Zhu , Xueqin Ren , Tairan Zhou , Yun Zhang , and Shuwen Hu [email protected] Authors Info & Affiliations https://doi.org/10.22541/au.175069279.95175843/v1 189 views 111 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract Saline-alkali soils are globally widespread, and in the context of global climate change, soil salinization is worsening. Improving these soils is crucial for food security and soil carbon storage, and thus, various measures have been used to mitigate salinization. Iron oxides protect soil organic carbon (SOC) over the long term, but the effects of saline-alkali soil improvement on iron-bound organic carbon (Fe-OC) remain unclear. Using data from saline-alkali soil improvements in Northeast China, this study examined the effects of two improvement methods on Fe-OC: the application of one traditional amendment and one new type of amendment. Both significantly increased Fe-OC content, shifting its association from adsorption to co-precipitation, thereby enhancing the formation and stability of Fe-OC and consequently promoting SOC sequestration. Both also facilitated the transformation of free iron minerals into complexed forms, reducing microbial carbon binding while maintaining the pattern of preferential binding of iron minerals with aromatic-C. Key factors driving these changes include improved soil nutrients, water content, and microorganisms, along with reduced soil pH. The mechanism suggests that our findings hold broad significance, as irrespective of the type of saline-alkali soil or the specific improvement measures utilized, all effective saline-alkali soil improvement methods will ultimately lead to increased soil nutrients, water content, and microbial diversity, alongside a decrease in soil pH. These processes collectively facilitate the formation and stabilization of Fe-OC. This study offers new insights into the effects of saline-alkali improvements on Fe-OC and SOC stabilization. Supplementary Material File (figures.docx) Download 802.75 KB File (manuscript.doc) Download 134.00 KB Information & Authors Information Version history V1 Version 1 23 June 2025 Copyright This work is licensed under a Non Exclusive No Reuse License. Keywords iron oxides iron-bound organic carbon mineral transformation saline-alkali soil improvement soil carbon sequestration Authors Affiliations Shuhan Wang China Agricultural University College of Resources and Environmental Sciences View all articles by this author Biao Zhu Peking University College of Urban and Environmental Sciences View all articles by this author Xueqin Ren China Agricultural University College of Resources and Environmental Sciences View all articles by this author Tairan Zhou China Agricultural University College of Resources and Environmental Sciences View all articles by this author Yun Zhang China Agricultural University College of Resources and Environmental Sciences View all articles by this author Shuwen Hu [email protected] China Agricultural University College of Resources and Environmental Sciences View all articles by this author Metrics & Citations Metrics Article Usage 189 views 111 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Shuhan Wang, Biao Zhu, Xueqin Ren, et al. Enhancement of the Formation and Stability of Iron-Bound Organic Carbon in Saline-alkali soils through Soil Improvement and Its Potential Mechanisms. Authorea . 23 June 2025. DOI: https://doi.org/10.22541/au.175069279.95175843/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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