Ye et al. (2025) Quadratic Response and Adaption of Vegetation Growth to Hydrological Drought in Heterogeneous Lake Floodplain Wetlands

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

Identification

• Journal: Water Resources Research
• Year: 2025
• Date: 2025-11-01
• Authors: Xuchun Ye, Enxin Yue, Yi Liu, Xianghu Li, Ligang Xu, Chong‐Yu Xu, Chuanzhe Li
• DOI: 10.1029/2025wr040172

Research Groups

Not specified in the abstract.

Short Summary

This study investigated the response of wetland vegetation growth to hydrological drought in China's Poyang Lake floodplain from 2000 to 2023, revealing a quadratic relationship between vegetation growth (EVI) and hydrological drought (SIAI) with significant time-lag and cumulative effects.

Objective

• To quantitatively analyze the responses and adaptation of wetland vegetation growth to hydrological drought in the heterogeneous floodplain wetlands of Poyang Lake.

Study Configuration

• Spatial Scale: Poyang Lake (China's largest lake floodplain system), with remote sensing data at 30 m spatial resolution.
• Temporal Scale: 2000 to 2023, with data resolutions of 8 days (NDWI) and 16 days (EVI). Analysis considered monthly and annual time scales, identifying time-lag effects of 1–4 months and cumulative effects of 2–11 months.

Methodology and Data

• Models used: A novel Standardized Inundation Area Index (SIAI) was proposed.
• Data sources: Multi-source remote sensing data and image fusion technology were used to construct continuous high-spatiotemporal resolution Normalized Difference Water Index (NDWI) and Enhanced Vegetation Index (EVI).

Main Results

• The Enhanced Vegetation Index (EVI) of the Poyang Lake floodplain wetlands exhibited a bimodal pattern annually, with peak growth observed in April and September.
• Trends in the Standardized Inundation Area Index (SIAI) indicated a long-term worsening condition of hydrological drought in the lake.
• Evident quadratic relationships were identified between EVI and SIAI at both monthly and annual time scales, characterized by a concave fitted curve, with maximum annual EVI occurring at an SIAI value of -1.46.
• The impact of hydrological drought on vegetation growth showed a time-lag effect of 1–4 months and a cumulative effect of 2–11 months from March to June, though these effects were potentially interrupted by summer flooding.
• Autumn vegetation growth was primarily dependent on contemporary lake water conditions.

Contributions

• Proposed a novel Standardized Inundation Area Index (SIAI) for assessing hydrological drought.
• Quantified the quadratic response of wetland vegetation growth to hydrological drought in a large floodplain system.
• Deepened the understanding of floodplain eco-hydrological adaptability under extreme water regimes, including specific time-lag and cumulative effects.

Funding

Not specified in the abstract.

Citation

@article{Ye2025Quadratic,
  author = {Ye, Xuchun and Yue, Enxin and Liu, Yi and Li, Xianghu and Xu, Ligang and Xu, Chong‐Yu and Li, Chuanzhe},
  title = {Quadratic Response and Adaption of Vegetation Growth to Hydrological Drought in Heterogeneous Lake Floodplain Wetlands},
  journal = {Water Resources Research},
  year = {2025},
  doi = {10.1029/2025wr040172},
  url = {https://doi.org/10.1029/2025wr040172}
}