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首页> 外文期刊>Acta Horticulturae >Effect of two irrigation frequencies on water status, leaf diffusive conductance and net photosynthesis in Protea eximia grown on gravel substrate
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Effect of two irrigation frequencies on water status, leaf diffusive conductance and net photosynthesis in Protea eximia grown on gravel substrate

机译：两种灌溉频率对砾石基质上生长的普罗梯亚Eximia水分状况，叶片扩散导度和净光合作用的影响

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摘要

Three-year-old P. eximia seedlings were grown on porphyry substrate in soilless greenhouse culture to study the effect of irrigating 2 and 6 times daily in summer. In both treatments, stomatal regulation appeared efficient in maintaining constant water content in leaves picked at noon. The highest leaf diffusive conductance, net photosynthesis rate and production of dry and fresh matter occurred with the higher watering frequency. Nonetheless, even the higher watering frequency did not prevent a gradual decrease in leaf diffusive conductance throughout the day. This may have been due to the low water retention capacity of porphyry or the insufficient frequency of irrigation. Several hypotheses are presented to explain low predawn water potential values (around -0.4 MPa).
机译：在无土温室栽培中，将三岁的P. eximia幼苗种植在斑岩基质上，以研究夏季每天灌溉2次和6次的效果。在这两种处理中，气孔调节似乎都能有效地保持中午采摘的叶片中恒定的水分含量。最高的叶片扩散电导率，净光合作用速率以及干鲜物质的产生以较高的浇水频率发生。但是，即使较高的浇水频率也不能防止全天叶片扩散电导逐渐降低。这可能是由于斑岩的保水能力低或灌溉频率不足造成的。提出了几种假设来解释黎明前的水势低（-0.4 MPa附近）。

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