Regulation of Water-Use Efficiency by Ecosystem-Type-Driven Soil–Plant–Water–Salt Coupling in Cold Arid Regions

Regulation of Water-Use Efficiency by Ecosystem-Type-Driven Soil–Plant–Water–Salt Coupling in Cold Arid Regions | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Regulation of Water-Use Efficiency by Ecosystem-Type-Driven Soil–Plant–Water–Salt Coupling in Cold Arid Regions Qixin He, Guangchao Cao, Guangzhao Han, Meiliang Zhao, Jiaqi Bai, and 1 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7244581/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 21 Jan, 2026 Read the published version in Scientific Reports → Version 1 posted 13 You are reading this latest preprint version Abstract Understanding how ecohydrological processes shape soil–plant–water interactions across various ecosystem types is vital for elucidating vegetation water-use strategies in cold, arid regions. This study focused on mountain ecosystems along the northeastern margin of the Qinghai–Tibet Plateau. By comprehensively collecting data on soil profiles, soil moisture and salinity characteristics, and plant leaf functional traits, we systematically evaluated the mechanisms by which these factors influence plant water-use efficiency (WUE). Our findings revealed that soil carbon, nitrogen, phosphorus, and moisture were markedly enriched in the surface layer (0–20 cm), with spatial heterogeneity largely controlled by ecosystem type. Patterns of water–salt interactions followed two distinct regimes: either moisture deficit accompanied by salt accumulation or simultaneous supplementation of water and salt, depending strongly on the hydrological and evapotranspiration context. Moreover, under water-limited conditions, WUE was mainly driven by photosynthetic and water-related traits, whereas in environments with ample water and nutrients, nutrient availability and metabolic traits played a dominant role. These results suggest that ecosystem-specific resource environments shape distinct adaptive strategies for plant water use. This study reveals the mechanism by which ecosystem types regulate water-use efficiency (WUE) through the coordinated effects of soil moisture patterns and plant functional traits. It provides a theoretical basis for understanding vegetation water adaptation strategies and guiding resource management in cold alpine mountain ecosystems. Biological sciences/Ecology Earth and environmental sciences/Ecology Earth and environmental sciences/Environmental sciences Biological sciences/Plant sciences Water-use efficiency (WUE) soil–plant–water interactions Mountain ecosystem ecohydrological processes cold–arid alpine region Full Text Additional Declarations No competing interests reported. Supplementary Files Supplementarymaterial.pdf Cite Share Download PDF Status: Published Journal Publication published 21 Jan, 2026 Read the published version in Scientific Reports → Version 1 posted Editorial decision: Revision requested 12 Nov, 2025 Reviews received at journal 06 Nov, 2025 Reviews received at journal 04 Nov, 2025 Reviewers agreed at journal 31 Oct, 2025 Reviewers agreed at journal 29 Oct, 2025 Reviewers agreed at journal 29 Oct, 2025 Reviewers agreed at journal 29 Oct, 2025 Reviews received at journal 20 Oct, 2025 Reviewers agreed at journal 07 Oct, 2025 Reviewers invited by journal 25 Sep, 2025 Editor assigned by journal 09 Sep, 2025 Submission checks completed at journal 07 Aug, 2025 First submitted to journal 07 Aug, 2025 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. 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