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<p>Dew occurs in most ecosystems, especially in arid and semi-arid regions, and represents an important water source regulating plant growth. In this study, the potential importance of dew for the growth of orange tree was investigated. Dew, sap flow, water use efficiency and trunk diameter of orange trees were monitored in the study area from May 2020 to November 2022. Dew events were classified into four grades for the purpose of data analysis as light dew (LD), moderate dew (MD), heavy dew (HD) and extremely heavy dew (ED). The results showed that dew amount (<i>CD</i>) accounted for 10% of rainfall amount (<i>RA</i>) and 12% of transpiration. Dew duration (<i>DD</i>) was nearly twice as long as rainfall duration (<i>RD</i>). The proportions of <i>DD</i> to <i>RD</i> were 1.493, 3.969 and 1.052 for the rainy, dry and dry-hot seasons, respectively. Plant water use efficiency (WUE) was correlated with <i>CD</i> and <i>DD</i>; WUE was higher in the dry-hot season, when dew amount was low. The average daily cumulative nighttime relative transpiration under dew present (DP) conditions was lower than under dew absent (DA) conditions. Compared with DA conditions, the daily increase of trunk diameter increased and trunk recovery time shortened with increasing dew grade under DP conditions. In addition, the maximum daily trunk shrinkage under DP conditions changed more than under DA conditions; apparently increasing with increasing dew grade. The results of this study deepen our understanding about the regulatory role of canopy dew in plant physiological and water states.</p>

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Potential significance of dew on orange plantation in the dry-hot region of Southwest China: physiological and hydrological aspects

  • 期刊论文

  • 发表日期：

    2026年6月18日

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  • Lucheng Qiu,
  • Dianyu Chen,
  • Xiaotao Hu,
  • XiongWei Xue,
  • Dongyan Zhang

摘要

Dew occurs in most ecosystems, especially in arid and semi-arid regions, and represents an important water source regulating plant growth. In this study, the potential importance of dew for the growth of orange tree was investigated. Dew, sap flow, water use efficiency and trunk diameter of orange trees were monitored in the study area from May 2020 to November 2022. Dew events were classified into four grades for the purpose of data analysis as light dew (LD), moderate dew (MD), heavy dew (HD) and extremely heavy dew (ED). The results showed that dew amount (CD) accounted for 10% of rainfall amount (RA) and 12% of transpiration. Dew duration (DD) was nearly twice as long as rainfall duration (RD). The proportions of DD to RD were 1.493, 3.969 and 1.052 for the rainy, dry and dry-hot seasons, respectively. Plant water use efficiency (WUE) was correlated with CD and DD; WUE was higher in the dry-hot season, when dew amount was low. The average daily cumulative nighttime relative transpiration under dew present (DP) conditions was lower than under dew absent (DA) conditions. Compared with DA conditions, the daily increase of trunk diameter increased and trunk recovery time shortened with increasing dew grade under DP conditions. In addition, the maximum daily trunk shrinkage under DP conditions changed more than under DA conditions; apparently increasing with increasing dew grade. The results of this study deepen our understanding about the regulatory role of canopy dew in plant physiological and water states.