Effects of vegetation cover and configuration on soil wind erosion based on wind tunnel experiments

doi:10.7522/j.issn.1000-694X.2023.00134

Journal of Desert Research ›› 2024, Vol. 44 ›› Issue (1): 235-243.DOI: 10.7522/j.issn.1000-694X.2023.00134

Effects of vegetation cover and configuration on soil wind erosion based on wind tunnel experiments

Lingling Kong(), Zhibao Dong(), Ziyi Bai, Fengjun Xiao, Huirong Ma, Ruicong Xu

School of Geography and Tourism，Shaanxi Normal University，Xi'an 710119，China

Received:2023-07-30 Revised:2023-10-11 Online:2024-01-20 Published:2023-12-26
Contact: Zhibao Dong

Abstract

Abstract:

Soil wind erosion is a serious environmental problem in northern China， and vegetation can effectively control soil wind erosion. In order to provide a basis for the design of soil wind erosion control program， this experiment was carried out in the southern margin of Mu Us Sandy Land with Leymus chinensis “Zhongke No.1” as the object. The effects of vegetation coverage （10%， 20%， 30% and 40%） and configuration mode （one-row-and-one-belt， two-row-and-one-belt， and cross-distributed） on the structure of wind-drift sand and the amount of wind erosion were studied. The results showed that：（1） The sediment transport intensity of each layer increases with the increase of wind speed and decreases with increasing coverage. The rate of sand transport conforms to an exponential function with coverage. The “elephant's trunk effect” appears in the structure of wind-blown sand flow. The increase of wind speed and coverage makes the height level of the peak intensity of sand transport move upward. （2） The variation of sediment transport intensity along vertical height is an exponential function distribution， and the sediment inhibition effect of two-row-and-one-line and cross-distribution is greater than that of one-row-and-one-belt. （3） From the perspective of optimal sand fixation efficiency and economic benefits， Leymus chinensis “Zhongke No.1” should be planted with a coverage of about 30%， and areas with higher wind speeds use a cross-distribution configuration.

Key words: vegetation coverage, vegetation configuration mode, wind-sand flow structure, Leymus chinensis, mobile wind tunnel

CLC Number:

K903

Lingling Kong, Zhibao Dong, Ziyi Bai, Fengjun Xiao, Huirong Ma, Ruicong Xu. Effects of vegetation cover and configuration on soil wind erosion based on wind tunnel experiments[J]. Journal of Desert Research, 2024, 44(1): 235-243.

Figures/Tables 8

Fig.1 Overview of the study area and experimental site

Fig.2 Experimental design

Fig.3 Structure of wind-drift sand flow with different vegetation coverage at each wind speed

Fig.4 Relationship between vegetation coverage and sand transport rate at different wind speeds

Table 1 Wind erosion suppression efficiency of different vegetation coverage（%）

风速 /（m·s^-1）	植被盖度/%
风速 /（m·s^-1）	10	20	30	40
7	50.99	85.43	96.37	95.80
9	54.66	75.60	90.46	93.73
11	33.45	39.03	71.64	87.08
13	53.62	68.38	82.78	88.32
平均值	48.18	67.11	85.31	91.23

Fig.5 Structure of wind-drift sand for each vegetation configuration at different wind speeds

Fig.6 Curves of sand transport intensity versus height under different vegetation configurations

Table 2 Wind erosion suppression efficiency of different vegetation configurations （%）

风速 /（m·s^-1）	植被配置方式
风速 /（m·s^-1）	一行一带	两行一带	交叉分布
7	72.11	86.64	87.69
9	74.54	83.66	77.64
11	49.64	62.39	61.37
13	72.29	71.71	75.83
平均值	67.15	76.10	75.63

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Effects of vegetation cover and configuration on soil wind erosion based on wind tunnel experiments

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