Zhang et al. (2025) Drip Irrigation in Dryland Agriculture Controls Soil Water‐Filled Pore Space and Reduces Greenhouse Gas Emissions: A Meta‐Analysis

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Identification

• Journal: Water Resources Research
• Year: 2025
• Date: 2025-09-01
• Authors: Liqiang Zhang, Zehang Zhao, Xiaohong Wu, Yuhan Yang, Hongyu Wang, Zhengguo Cui, Qiuzhu Li, Jinhu Cui
• DOI: 10.1029/2024wr039388

Research Groups

Not specified in the provided text.

Short Summary

This meta-analysis quantifies the impact of drip irrigation (DI) on greenhouse gas emissions in dryland agriculture, concluding that DI reduces global warming potential primarily by decreasing soil moisture.

Objective

• To quantify the effects of dryland drip irrigation on greenhouse gas (GHG) emissions under varying climatic conditions, soil conditions, and agricultural management practices.

Study Configuration

• Spatial Scale: Global dryland agricultural areas.
• Temporal Scale: Not explicitly specified, though long-term effectiveness was evaluated.

Methodology and Data

• Models used: Meta-analysis.
• Data sources: Published scientific literature on dryland irrigation and GHG emissions.

Main Results

• Emission Changes:
  • $\text{N}2\text{O}$ emissions: decreased by 29.2%
  • $\text{CO}2$ emissions: decreased by 6.1%
  • Global Warming Potential (GWP): decreased by 18.7%
  • $\text{CH}_4$ emissions: increased by 9.7%–14.0%
• Mechanism: Reduction in emissions is driven by a decrease in soil moisture content (water-filled pore space).
• Optimal Management Strategy: Emission reduction is maximized when:
  • Irrigation scheduling is $> 70\%$.
  • Nitrogen application is between $180\text{--}300\text{ kg ha}^{-1}$.
  • Shallow buried DI is used with water flow controlled below $2\text{ L hr}^{-1}$.
• Additional Findings: DI shows greater long-term effectiveness for $\text{N}2\text{O}$ and $\text{CO}2$ reduction and is particularly effective when combined with greenhouse vegetable production.

Contributions

• Provides a quantitative synthesis of how drip irrigation affects different GHG species.
• Identifies specific technical parameters (nitrogen rates, flow rates, and burial depth) to optimize DI for climate change mitigation in drylands.

Funding

Not specified in the provided text.

Citation

@article{Zhang2025Drip,
  author = {Zhang, Liqiang and Zhao, Zehang and Wu, Xiaohong and Yang, Yuhan and Wang, Hongyu and Cui, Zhengguo and Li, Qiuzhu and Cui, Jinhu},
  title = {Drip Irrigation in Dryland Agriculture Controls Soil Water‐Filled Pore Space and Reduces Greenhouse Gas Emissions: A Meta‐Analysis},
  journal = {Water Resources Research},
  year = {2025},
  doi = {10.1029/2024wr039388},
  url = {https://doi.org/10.1029/2024wr039388}
}