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Journal of Desert Research ›› 2023, Vol. 43 ›› Issue (1): 83-95.DOI: 10.7522/j.issn.1000-694X.2022.00079

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Effects of surface dew under different types of sand-fixing shrubs in the southern margin of Mu Us Sandy LandNorthern China

Xiaohan Chen(), Yongsheng Wu(), Chunxing Hai   

  1. College of Geographical Science / Key Laboratory of Mongolian Plateau's Climate System,Inner Mongolia Normal University,Hohhot 010022,China
  • Received:2022-04-08 Revised:2022-05-11 Online:2023-01-20 Published:2023-01-17
  • Contact: Yongsheng Wu

Abstract:

Although the important role of dew in arid system has been widely recognized, its characteristics of temporal and spatial variation under sand-fixing shrubs has been paid less attention. To better understand the influence of surface dew under sand-fixing shrubs, three typical artificial sand-fixing shrubs (Salix psammophila,Caragana korshinskii and Artemisia ordosica) on the southern edge of the Mu Us Sandy Land, Northern China were selected and the bare sand without the effect of sand-fixing shrubs was used as the control in this study. The deposition and evaporation characteristics of surface dew in different positions (root, 1/2 crown width and periphery crown width) and directions (east, south, west and north) under sand-fixing shrubs were measured by micro-lysimeter. The results showed:(1) compared with the control, the presence of sand-fixing shrubs significantly reduced the amount of surface dew, and the amount of dew under Salix psammophilaArtemisia ordosica and Caragana korshinskii decreased by 29%, 32% and 33% respectively. (2) The amount of surface dew under different types of sand-fixing shrubs showed a significant increasing trend from the inside to the outside, but the difference in the amount of surface dew in different directions was not significant. (3) The existence of sand-fixing shrubs slowed down the deposition and evaporation of surface dew, that was, the formation of dew started at 19:00 at night, ended at 08:00 the next day, and evaporated from 13:00-15:00. The deposition process of dew showed an overall trend of increasing, fluctuating and increasing. The surface dew under Caragana korshinskii and Artemisia ordosica even evaporated a little from 03:00 to 05:00, and the evaporation process showed a steady downward trend. (4) The formation process of dew had a significant positive correlation with relative humidity, and a significant negative correlation with atmospheric temperature and surface temperature. Sand-fixing shrubs buffered surface temperature changes by intercepting solar radiation to slow down the deposition and evaporation processes of dew.

Key words: dew, sand-fixing shrubs, evaporation, Mu Us Sandy Land, arid ecosystem

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