섬유

evapotranspiration estimates derived from subsoil salinity data

  • 출판일1999.03
  • 저자
  • 서지사항
  • 등록일 2016.11.02
  • 조회수 238
a method is described for estimating past evapotranspiration (et) rates from irrigated fields. it is based on the assumption that salt concentrations below the crop root zone are a function of the flux of naturally occurring salts applied by irrigation at the soil surface and the rate of soil water depletion due to et. thus, if irrigation histories and subsoil salinity data are available, et rates may be calculated. for irrigated fields with low leaching fractions, corrections to the et estimates may be necessary due to chemical precipitation. this is done through modeling os solution chemistry or from the use of observed chloride concentrations in solution. et estimates for 1976-1980 for cotton at safford, arizona were made from subsoil salinity data collected to 3 m in april 1983 (edited author abstract) refs
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