Wang et al. (2025) Canopy Water Loss and Physiological Water-Use Responses of Xerophytic Shrubs Under Wet Conditions on the Northern Loess Plateau

⚠️ Warning: This summary was generated from the abstract only, as the full text was not available.

Identification

• Journal: Horticulturae
• Year: 2025
• Date: 2025-12-24
• Authors: Sheng Wang, Na Yang, Jun Fan, Chuan Yuan
• DOI: 10.3390/horticulturae12010013

Research Groups

Not explicitly mentioned in the provided text.

Short Summary

This study investigated the hierarchy of atmospheric and soil-water controls on canopy transpiration and stomatal conductance in two xerophytic shrubs on the northern Loess Plateau under wet conditions. It found that atmospheric factors are the primary drivers, with soil water content exerting secondary, species-specific influences, revealing depth-partitioned water-use strategies.

Objective

• To test hypotheses concerning the hierarchy of atmospheric and soil-water controls on canopy transpiration (Ec), stomatal conductance (gs), the strength of canopy–atmosphere coupling, and species-specific soil-water sensitivities and water-use strategies in Caragana korshinskii and Salix psammophila.

Study Configuration

• Spatial Scale: Two adjacent stands of Caragana korshinskii and Salix psammophila.
• Temporal Scale: Wet season of a climatically wet year (July–September 2017), spanning three months.

Methodology and Data

• Models used: Not explicitly mentioned as used in this study.
• Data sources: Concurrent measurements of branch-level sap flow, meteorological variables (e.g., vapor pressure deficit), and soil water content (SWC) at multiple depths.

Main Results

• Meteorological factors, particularly vapor pressure deficit (VPD), were the dominant drivers of daily canopy transpiration (Ec) and stomatal conductance (gs).
• Soil water content (SWC) exerted secondary but species-specific influences on water use.
• Both shrub species were strongly coupled to the atmosphere, exhibiting consistently low decoupling coefficients (Ω ≈ 0.11–0.15) on daily scales.
• Caragana korshinskii maintained stable water use by accessing deeper soil water.
• Salix psammophila responded sensitively to fluctuations in shallow soil water content.
• These contrasting patterns indicate depth-partitioned water-use strategies and a context-dependent continuum between isohydric and anisohydric behavior, rather than fixed species traits.

Contributions

• Provides crucial understanding of how cultivated xerophytic shrubs physiologically regulate canopy water loss under anomalously wet conditions.
• Supports improved parameterization of shrub water use in ecohydrological models.
• Offers practical guidance for more effective water-use management, informed species selection, and nursery practices for landscape restoration in semi-arid regions experiencing warming–wetting climatic shifts.

Funding

Not explicitly mentioned in the provided text.

Citation

@article{Wang2025Canopy,
  author = {Wang, Sheng and Yang, Na and Fan, Jun and Yuan, Chuan},
  title = {Canopy Water Loss and Physiological Water-Use Responses of Xerophytic Shrubs Under Wet Conditions on the Northern Loess Plateau},
  journal = {Horticulturae},
  year = {2025},
  doi = {10.3390/horticulturae12010013},
  url = {https://doi.org/10.3390/horticulturae12010013}
}