吉林大学学报(工学版) ›› 2004, Vol. ›› Issue (4): 573-577.

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Diurnal variation of plant stem sap flow and its application in plant water deficiency diagnosis

LI Guochen1,2, YU Haiyie1, MA Chenglin1, WANG Rui1   

  1. 1. College of Biological and Agricultural Engineering, Jilin University, Changchun 130022, China;
    2. Agricultural Engineering College, Shenyang Agriculture University, Shenyang 110161, China
  • Received:2004-02-18 Online:2004-10-01

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Abstract: The diurnal variations of the cucumber stem sap flow(SSF) under different environmental conditions and their effects on SSF were discussed. The study revealed that the dirunal variation of SSF has a clear rhythm. SSF ascends promptly in the morning(6:00～10:00 am) and peaks at noon(11:30～14:00), then descends slowly towards evening and reaches down to the valley at night.SSF is greatly affected by the meteorological factors such as solar radiation intensily, air huminity and temperature,etc. Under the same environment, the correlation factor ρ of diurnal SSF curves between cucumber stem with and without sufficient water supply reflects the water deficit degree of peant. When ρ <0.80～0.77, the leaves of cucumber begin to wither. Based on the variation of SSF, a plant water deficiency diagnosis system using the neural network technique was developed. The experiments showed that the system prediction is in good agreement with the measured results.

Key words: agricultural engineering, sunlight greenhouse, stem sap flow, water deficiency

CLC Number: 

  • S625.5
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