Meta-analysis as a statistical tool for evaluating the hydrologic effects of water table management

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

Controlled drainage is a water table management practice used to reduce drainage volumes and environmental impact of subsurface drainage. Meta-analysis was conducted with fifty-three controlled drainage volume reduction results selected from twenty papers published between 1979 and 2008 to study the underlining factors influencing controlled drainage responses. The observations showed a wide variation in effectiveness of controlled drainage across different soils, crops and locations: drainage volumes reductions from -8% to 95% have been reported in literature. To investigate the potential causes for this wide variation, we performed a meta-analysis to aggregate the controlled drainage results using the log-response ratio effect size. The results of the meta-analysis showed that the effectiveness of controlled drainage depends on a combination factors: soil texture, crop type, and varies by hardiness zones. A chronologic, cumulative metaanalysis of fifty-three controlled drainage studies demonstrated that controlled drainage is effective and with a mean effect of 47%. A categorical meta-analysis suggested that soil types, crop types and differences in seasonality affect the effectiveness of controlled drainage to reduce drainage volumes.

Original languageEnglish (US)
Title of host publicationAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2009, ASABE 2009
Pages2787-2804
Number of pages18
StatePublished - Dec 1 2009
EventAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2009 - Reno, NV, United States
Duration: Jun 21 2009Jun 24 2009

Publication series

NameAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2009, ASABE 2009
Volume5

Other

OtherAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2009
CountryUnited States
CityReno, NV
Period6/21/096/24/09

Keywords

  • Categorical meta-analysis
  • Cumulative meta-analysis
  • Drainage
  • Effect size
  • Nitrate losses
  • Water quality

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