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

doi:10.7522/j.issn.1000-694X.2022.00079

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 Land， Northern China

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

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

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 psammophila， Artemisia 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

CLC Number:

S152.7

Xiaohan Chen, Yongsheng Wu, Chunxing Hai. Effects of surface dew under different types of sand-fixing shrubs in the southern margin of Mu Us Sandy Land， Northern China[J]. Journal of Desert Research, 2023, 43(1): 83-95.

Figures/Tables 12

Fig.1 Schematic diagram of the geographical location of the study area and plot layout

Table 1 Basic characteristics of different types of sand-fix shrubs in the study area

指标	灌丛类型
指标	沙柳	柠条	油蒿
平均直径/cm	333±9	299±16	98±4
平均高度/cm	259±6	216±10	50±2
平均一级枝条数/枝	119±9	77±2	47±2
平均投影面积/m²	8.7±0.5	7.2±1.0	0.8±0.1
平均一级枝条直径/mm	9.4±0.8	14.7±0.2	4.8±0.2
一级枝条与地面夹角/(°)	55±2	55±1	33±1

Fig.2 Variation of daily dew of different types of sand-fixing shrubs and control group during the experimental period

Fig.3 Variation of daily average dew amount and cumulative dew amount of different types of sand-fixing shrubs and control group during the experimental period

Fig.4 Diurnal variation of surface dew at different locations under the influence of different sand-fixing shrubs

Fig.5 Diurnal variation of surface dew in different directions under the influence of different sand-fixing shrubs

Fig.6 Variation of cumulative surface dew in different locations and directions under the influence of different types of sand-fixing shrubs

Table 2 Results of multivariate analysis of variance on the effects of shrub types， directions， locations and their interactions on surface dew

项目	自由度（df）	F	P值
灌丛类型	2	2.665	0.070
方向	3	1.137	0.333
位置	2	15.723	0.000
灌丛类型×方向	6	0.484	0.820
灌丛类型×位置	4	0.193	0.942
方向×位置	6	0.218	0.971
灌丛类型×方向×位置	12	0.133	1.000

Fig.7 Deposition and evaporation process of surface dew under the influence of control group and different types of sand-fixing shrubs

Fig.8 Variations of surface temperature at different locations （A-C） and directions （D-F） under different types of sand-fixing shrubs

Table 3 Results of correlation analysis between dew amount and meteorological factors

气象因子	对照凝结水量	沙柳凝结水量	柠条凝结水量	油蒿凝结水量
大气温度	-0.783^**	-0.800^**	-0.786^**	-0.743^**
相对湿度	0.803^**	0.786^**	0.763^**	0.702^**
风速	-0.143	-0.131	-0.095	-0.019
对照地表温度	-0.852^**	-0.861^**	-0.845^**	-0.778^**
空气地表温度差	0.803^**	0.801^**	0.785^**	0.699^**

Fig.9 The relationship between the formation and evaporation process of dew and meteorological factors. A-E represent the relationship between dew deposition and evaporation process with air temperature， air relative humidity， control group surface temperature， wind speed and air surface temperature difference respectively； F represents the hange of air temperature and surface temperature. Observation on September 27-29,2021

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

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