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<p>The spatial and temporal heterogeneity of precipitation on the Qinghai-Tibetan Plateau has significantly delayed the natural recovery of alpine desertified grasslands, sometimes leading to irreversible degradation. Amphiphilic hydrogels, as novel soil stabilization materials, demonstrate considerable potential for vegetation restoration due to their ability to improve soil structure and regulate moisture. This study investigated the effects of an independently developed amphiphilic hydrogel on the improvement of sandy soil and the growth of five pioneer herbaceous species (alfalfa, <i>Astragalus adsurgens</i>, oats, tall fescue, and ryegrass) across a concentration gradient (0%-1% w/w). The primary mechanism by which the hydrogel operated was to postpone the onset of drought stress by markedly enhancing soil water retention. This delayed soil drying meant that at the same point in time, plants in hydrogel-treated soils experienced less intense water deficit than those in untreated controls. Consequently, application at the optimal concentration range of 0.5%-0.75% sustained plant growth and physiological function, mitigated oxidative stress, and slowed the wilting process. Legumes (<i>Astragalus adsurgens</i> and alfalfa) exhibited higher inherent drought tolerance than gramineous species. This study clarified how amphiphilic hydrogels enhance plant drought adaptation primarily by modulating the soil water environment and delaying drought stress. It provides a quantitative, technically viable strategy based on the synergistic regulation of the “material-soil-plant” system for ecological restoration in alpine sandy lands.</p>

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The role of amphiphilic hydrogels on plant growth and physiology in alpine sandy land during drought stress

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Qingwen Yang,
  • Feng Guo,
  • Xiangjun Pei,
  • Shenghua Cui,
  • Zhi Chen

摘要

The spatial and temporal heterogeneity of precipitation on the Qinghai-Tibetan Plateau has significantly delayed the natural recovery of alpine desertified grasslands, sometimes leading to irreversible degradation. Amphiphilic hydrogels, as novel soil stabilization materials, demonstrate considerable potential for vegetation restoration due to their ability to improve soil structure and regulate moisture. This study investigated the effects of an independently developed amphiphilic hydrogel on the improvement of sandy soil and the growth of five pioneer herbaceous species (alfalfa, Astragalus adsurgens, oats, tall fescue, and ryegrass) across a concentration gradient (0%-1% w/w). The primary mechanism by which the hydrogel operated was to postpone the onset of drought stress by markedly enhancing soil water retention. This delayed soil drying meant that at the same point in time, plants in hydrogel-treated soils experienced less intense water deficit than those in untreated controls. Consequently, application at the optimal concentration range of 0.5%-0.75% sustained plant growth and physiological function, mitigated oxidative stress, and slowed the wilting process. Legumes (Astragalus adsurgens and alfalfa) exhibited higher inherent drought tolerance than gramineous species. This study clarified how amphiphilic hydrogels enhance plant drought adaptation primarily by modulating the soil water environment and delaying drought stress. It provides a quantitative, technically viable strategy based on the synergistic regulation of the “material-soil-plant” system for ecological restoration in alpine sandy lands.