Shao Mingan,Kang Shaozhong,Cai Huanjie.A STUDY ON THE AXIAL HYDRAULIC RESISTANCE TO WATER FLOW IN PLANT ROOTS[J].Research of Soil and Water Conservation,1991,(01):52-56.
植物根系轴向水流阻力的研究
- Title:
- A STUDY ON THE AXIAL HYDRAULIC RESISTANCE TO WATER FLOW IN PLANT ROOTS
- 摘要:
- 本文以泊潇叶定律为基础,提出了测定植物根系轴向水流阻力的降水头法,并用此法对鹰嘴豆根系的轴向阻力进行了不测定.结果表明:降水头法其测定可靠性是令人满意的,尤其适用在较短时间内测定根系的轴向阻力.根轴向水流阻力的泊潇叶公式计算值与实测值的比较结果表明:对鹰嘴豆根系来说,实测值总大于计算值:二者的比值随根导管调和平均直径的减少而增加.所有不同直径根轴向阻力测定平均值为计算值的3.8倍.
- Abstract:
- A falling head method of measurig the axial hydraulic resistance of plant roots was presented,based on the Poiseuille’s Law.The method was used to measure the axial hydraulic resistance to water flow in chickpea root.The results showed that the reliability of the method was satisfactory,especially for the shorter time measurement.Comparison between calculation of Poiseuille Formula and measurement of the axial resistance in chickpea roots showed that the value of measurement was always greater than that of calculation and the ratio of the former to later increased with the increase of mean diameter of vessels in xylem.The mean axial resistance of measurement was 3.8 times as much as that of calculation for chickpea roots.
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