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[Soil evaporation under perforated plastic mulch].

Yi Li1, Quanjiu Wang, Wenyan Wang

  • 1College of Life and Grographical Science, Qinghai Normal University, Xining 810008, China. liyimm@tom.com

Ying Yong Sheng Tai Xue Bao = the Journal of Applied Ecology
|June 10, 2005
PubMed
Summary

Perforated plastic mulches increase soil water evaporation in arid regions, especially with higher irrigation. Increased perforation rates significantly enhance water loss, contrary to their intended use.

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Area of Science:

  • Agricultural Science
  • Soil Science
  • Environmental Science

Background:

  • Arid and semiarid regions face water scarcity due to high evaporation rates.
  • Perforated plastic mulches are commonly used to conserve soil moisture by reducing evaporation.

Purpose of the Study:

  • To investigate the impact of varying perforated plastic mulch rates on soil water evaporation post-irrigation.
  • To quantify the relationship between mulch perforation, irrigation levels, and water loss.

Main Methods:

  • A soil column experiment was designed with six different perforated mulch types.
  • Four irrigation levels were applied, and soil water evaporation was meticulously measured.
  • Statistical analysis was performed to establish predictive functions for cumulative evaporation.

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Main Results:

  • Cumulative evaporation increased significantly with higher perforation rates (up to 48.5 times the control with 100% perforation).
  • Water loss was directly proportional to the amount of irrigation applied.
  • A linear relationship between cumulative evaporation and time was observed, aligning with Gardner's theory.

Conclusions:

  • High perforation rates in plastic mulches exacerbate soil water evaporation, particularly under increased irrigation.
  • The study provides predictive functions for cumulative evaporation based on time, perforation rate, and irrigation amount.
  • Findings challenge the efficacy of highly perforated mulches for water conservation in arid environments.