Night-time leaf wetting process and its effect on the morning humidity gradient as a driving force of transpirational water loss in a semi-arid cornfield
Night-time leaf wetting process and its effect on the morning humidity gradient as a driving force of transpirational water loss in a semi-arid cornfield
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DOI：
10.1515/biolog-2015-0175
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发表时间：
2015-11
期刊：
影响因子：
1.5
通讯作者：
D. Yasutake;M. Mori;M. Kitano;Ryosuke Nomiyama;Yuta Miyoshi;Daisuke Hisaeda;Hiroyui Cho;K. Tagawa;Yueru Wu;Weizhen Wang
中科院分区：
文献类型：
--
作者：
D. Yasutake;M. Mori;M. Kitano;Ryosuke Nomiyama;Yuta Miyoshi;Daisuke Hisaeda;Hiroyui Cho;K. Tagawa;Yueru Wu;Weizhen Wang
分析了半干旱玉米地夜间叶片湿润过程与微气象条件的关系，并在次日早晨参照蒸腾的驱动力--叶片-空气湿度梯度来检验其影响。叶片湿润是在晴朗平静的夜间条件下结露造成的，使冠层表面温度降至空气露点温度。日出前后(6时)收集的叶片露量为26.4g~104.3 g m−2·叶面积，相当于0.07~0.27 mm的水分。叶片湿度一直维持到上午10点左右，叶温显著降低。结果是，与非湿润叶片相比，湿润叶片中的叶-空气湿度梯度也减小了。这些结果表明，在半干旱环境中，夜间叶片湿润导致蒸腾速率降低，这可能在减轻由于早晨过量蒸腾失水造成的植物水分胁迫中发挥作用。为了证明这种可能的影响，还需要进一步的研究。
Abstract Night-time leaf wetting process was analyzed in relation to micrometeorological conditions in a semi-arid cornfield and its effect was examined in the following morning with reference to the leaf-to-air humidity gradient which is a driving force in transpiration. Leaf wetness occurred due to dew formation under clear and calm night conditions which decreased canopy surface temperature to the air dew-point temperature. The amount of dew on leaves collected around sunrise (06:00) was 26.4-104.3 g m−2 · leaf area, which corresponded to 0.07-0.27 mm water. Leaf wetness remained until around 10:00 and significantly decreased leaf temperature. As a result, the leaf-to-air humidity gradient also decreased in the wetted leaf compared to the non-wetted leaf. These results suggest that night-time leaf wetting induces lower transpiration rate and may play a role in diminishing plant water stress due to excess transpirational water loss in the morning in semi-arid environments. Further studies are needed in order to demonstrate this possible effect.