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<p>As global agriculture faces the dual pressures of intensifying water scarcity and climate instability, optimizing Water-Use Efficiency (WUE) is essential for food security. While organic systems are recognized for their sustainability, the mechanisms governing their superior hydraulic performance remain fragmented across disciplines. This review addresses this knowledge gap by synthesizing the synergistic interactions between soil physical hydrology and microbial functions. We propose a novel hydro-microbial feedback loop as the primary driver of enhanced WUE. Our synthesis reveals that organic management fosters a living hydraulic continuum where biological engineers—specifically arbuscular mycorrhizal fungi (AMF) and biofilm-producing bacteria—actively modify soil properties. Through the production of glomalin and extracellular polymeric substances (EPS), these microbes stabilize soil aggregates, maximizing water infiltration while minimizing evaporative loss. Furthermore, we examine how microbially mediated nutrient cycling sustains plant physiological vigor under moisture stress.To contextualize these mechanisms, we integrate new metagenomic and ecological data from the Kalsi-Chakrata vertical gradient in Uttarakhand, India. This case study demonstrates a transition from human-managed chemical processing in valley basins (Vikasnagar) to sophisticated, microbially mediated survival strategies in high-altitude alpine zones (Thana), characterized by cryo-protective and stress-tolerant genomic profiles. By establishing a functional framework for soil health resilience, this paper identifies methodological limitations and proposes a future research agenda focused on hydro-microbiological modeling. Shifting perspectives toward the soil as a dynamic, biologically regulated hydraulic system is essential for advancing agricultural resilience in an increasingly uncertain climate.</p>

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The Hydro-Microbial Nexus and Ecological Stratification in Himalayan Agroecosystems

  • 期刊论文

  • 发表日期：

    2026年5月20日

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  • Shubham Prakash,
  • Sneha Verma,
  • Madhuri Kumari,
  • Namrata Bhattacharya,
  • Mamta Mehra,
  • Chitranjan Kumar

摘要

As global agriculture faces the dual pressures of intensifying water scarcity and climate instability, optimizing Water-Use Efficiency (WUE) is essential for food security. While organic systems are recognized for their sustainability, the mechanisms governing their superior hydraulic performance remain fragmented across disciplines. This review addresses this knowledge gap by synthesizing the synergistic interactions between soil physical hydrology and microbial functions. We propose a novel hydro-microbial feedback loop as the primary driver of enhanced WUE. Our synthesis reveals that organic management fosters a living hydraulic continuum where biological engineers—specifically arbuscular mycorrhizal fungi (AMF) and biofilm-producing bacteria—actively modify soil properties. Through the production of glomalin and extracellular polymeric substances (EPS), these microbes stabilize soil aggregates, maximizing water infiltration while minimizing evaporative loss. Furthermore, we examine how microbially mediated nutrient cycling sustains plant physiological vigor under moisture stress.To contextualize these mechanisms, we integrate new metagenomic and ecological data from the Kalsi-Chakrata vertical gradient in Uttarakhand, India. This case study demonstrates a transition from human-managed chemical processing in valley basins (Vikasnagar) to sophisticated, microbially mediated survival strategies in high-altitude alpine zones (Thana), characterized by cryo-protective and stress-tolerant genomic profiles. By establishing a functional framework for soil health resilience, this paper identifies methodological limitations and proposes a future research agenda focused on hydro-microbiological modeling. Shifting perspectives toward the soil as a dynamic, biologically regulated hydraulic system is essential for advancing agricultural resilience in an increasingly uncertain climate.