Limiting factor of dew formation changes seasonally in a semiarid crop field of northwest China
Limiting factor of dew formation changes seasonally in a semiarid crop field of northwest China
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DOI：
10.1016/j.agrformet.2021.108705
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发表时间：
2021-12
影响因子：
6.2
通讯作者：
G. Yokoyama;D. Yasutake;Weizhen Wang;Yueru Wu;Jiaojiao Feng;Leilei Dong;Kensuke Kimura;Atsushi Marui-Ats
中科院分区：
文献类型：
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作者：
G. Yokoyama;D. Yasutake;Weizhen Wang;Yueru Wu;Jiaojiao Feng;Leilei Dong;Kensuke Kimura;Atsushi Marui-Ats
了解露水形成的季节性和年度变化是如何受农田环境因素控制的，对于利用露水作为农业生产的水资源是必要的。辐射冷却强度、风速和水汽压是形成结露的关键环境因子。然而，如何在这些环境因素的季节性和年度变化影响露水形成的变化进行了详细的调查是未经探索的。我们研究了露水特性（频率，数量和持续时间）和环境因素的半干旱作物田在玉米栽培期间（4月至9月）的关系，为三年。春季（4 - 6月），虽然夜间净辐射有较大的负辐射，表明辐射冷却强度较强，但很少出现露水，而且数量很少。相反，在夏季（7月至9月），露水频繁发生，尽管较低的辐射冷却强度，在大量的。春季水汽压较低，露源缺乏，限制了露的形成。在夏季，水汽压较高，露水的形成主要受辐射冷却强度的限制。3年来，栽培期露量平均占降雨量的5.4%。然而，露水发生的频率比降雨量在53%的天，包括栽培期。此外，露水湿润叶片的发生约10小时，表明露水湿润叶片对植物的生态生理功能的显着影响。这项研究的结果应推进了解露水的形成是如何控制的半干旱作物田的环境要素的变化，这将有助于提高利用露水作为农业生产的水资源。
Understanding how seasonal and annual variations in dew formation are controlled by environmental elements of a crop field is necessary for utilizing dew as a water resource for agricultural production. Radiative cooling intensity, wind speed, and water vapor pressure are the key environmental elements for the dew formation. However, a detailed investigation of how seasonal and annual variations in these environmental elements affect the variation in dew formation is unexplored. We examined the relationship between dew characteristics (frequency, amount, and duration) and environmental elements of a semiarid crop field during the cultivation period of corn (April–September) for three years. In spring (April–June), though large nighttime negative net radiation, which indicates strong radiative cooling intensity, was observed, dew rarely occurred and only in small amounts. Conversely, in summer (July–September), dew frequently occurred and in larger amounts despite the lower radiative cooling intensity. In spring, lower water vapor pressure was observed, and thus dew formation was limited by the lack of water source of dew. In summer, water vapor pressure was high, and dew formation was predominantly limited by the radiative cooling intensity. The dew amount during the cultivation period accounted for 5.4% of the rainfall amount on average over the 3 years. However, dew occurred more frequently than rainfall at 53% of the days comprising the cultivation period. Additionally, the occurrence of dew wet the leaves for approximately 10 h indicating the significant impact of leaf wetting by dew on plant eco-physiological functions. The results of this study should advance the understanding of how dew formation is controlled by variations in the environmental elements of a semiarid crop field, which will contribute to improving the utilization of dew as a water resource for agricultural production.