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Volume 6 Issue 4
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Kang Shaozhong, Zhang Fuchang, Liu Xiaoming. Calculation Method of the Ratio between Crop Leaf Transpiration and Soil Evaporation from Farmland[J]. Advances in Water Science, 1995, 6(4): 285-289.
Citation: Kang Shaozhong, Zhang Fuchang, Liu Xiaoming. Calculation Method of the Ratio between Crop Leaf Transpiration and Soil Evaporation from Farmland[J]. Advances in Water Science, 1995, 6(4): 285-289.
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Calculation Method of the Ratio between Crop Leaf Transpiration and Soil Evaporation from Farmland

  • College of Hydraulic and Architectural Engineering, Northwestern Agricultural University, Yiangling 712100

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  • Received Date: July 29, 1994
  • Revised Date: February 19, 1995
    Graphical Abstract
    • Abstract
  • Based on the measured net radiation data above the canopy and on the soil surface under the crop canopy in winter wheat and summer corn field,a calculation model of the ratio between crop leaf transpiration and soil evaporation from farmland has been established in this paper.The model can express the physical oaring laws of the ratio correctly and is practical and useful.The research result shows that the ratio between leaf transpiration and soil evaporation a is increased with the leaf area index increasing,has a daily change and is higher in mid-noon and lower in the early morning and near night.The daily change process is influenced by leaf stomata movement.
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    • References (1)
  • [1]
    1 Nadine B,Bernard S,Patrick B.Agrometeorological soil water balance for crop simulation models.Agriculture and Forest Meteorology.1992,59:267-287
    2 Khafaf S A,Sharhan E A.Wierenga P J,et al.Some empirical relations for the prediction of soil evaporation,transpiration and root water uptake under field conditions.Agricultural water Management.1989,16:323-335
    3 Richie J T,Burnett E.Dryland evaporative flux in a subhumid climate,I,plant influences.Agron J.1971,63:56-62
    4 Tetsuo Sakuratani.Studies on Evapotranspiration from crops,(2) separate estimation of transpiration and evaporation from a soybean field without water shortage.J.Agric Met.1987,42(4):309-317
    5 康绍忠,刘晓明,王振锰.冬小麦叶片水势、气孔阻力、蒸腾速率与环境因素的关系.灌溉排水.1991,10(3):260-266
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