The influence of eco-mat laying on sand fixation and soil temperature and humidity

doi:10.7522/j.issn.1000-694X.2023.00075

Journal of Desert Research ›› 2023, Vol. 43 ›› Issue (5): 186-193.DOI: 10.7522/j.issn.1000-694X.2023.00075

The influence of eco-mat laying on sand fixation and soil temperature and humidity

Yanxia Pan(), Yang Zhao, Zhishan Zhang

Shapotou Desert Research and Experiment Station，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China

Received:2023-04-21 Revised:2023-06-30 Online:2023-09-20 Published:2023-09-27

Abstract

Abstract:

The restoration and reconstruction of reasonable vegetation coverage and soil habitat， and the maintenance of ecosystem stability and sustainable development are important objectives of desertification land govern in arid and semi-arid regions. As an effective and economical environmental protection material for water conservation， soil improvement and plant growth， eco-mat has been widely used in desertification control. The study on the influence of eco-mat laying on sand fixation and soil temperature and humidity can provide theoretical basis for wind prevention， sand fixation and vegetation construction in sandy area. This paper takes sand dunes covered by different eco-mats and mobile sand dunes （control area） in the southeast edge of Tengger Desert as the research object， to analyze the influence rule of eco-mat laying on wind-sand flow， soil temperature and soil moisture. The results indicated that eco-mats significantly increased the soil surface roughness of quicksand and decreased the sediment transport. The surface roughness of eco-mats experimental plots for pin shape laying with grass seed， pin shape laying without grass seed， strip shape laying with grass seed， strip shape laying without grass seed was 45， 22， 29 and 15 times as much as that of the surface layer of quicksand， the surface sediment transport for 0 to 20 cm was reduced by 90.57%， 87.14%， 88.14%， and 86.71% compared to quicksand， respectively. When the temperature was low， the soil temperature of 0-20 cm layer under eco-mats coverage was lower than that of quicksand， the result was opposite when the soil temperature wad high. Eco-mats laying increased the soil moisture content of 0-100 cm layer， only the value of 0-20 cm layer was lower than the quicksand， the soil moisture content of 40-60 cm， 60-80 cm and 80-100 cm was 1.61， 1.28 and 1.83 times of that of quicksand， respectively. Eco-mats coverage plays an important role in increasing surface roughness， reducing sediment transport， heat preservation， reducing evaporation， and maintaining soil moisture， which provides favorable conditions for the survival and growth of vegetation in sandy areas.

Key words: eco-mat, roughness, sediment transport, soil temperature, soil moisture

CLC Number:

S157.2

Yanxia Pan, Yang Zhao, Zhishan Zhang. The influence of eco-mat laying on sand fixation and soil temperature and humidity[J]. Journal of Desert Research, 2023, 43(5): 186-193.

Figures/Tables 7

Fig.1 Experimental plots of eco-mats

Fig.2 Wind rose diagram at 2 m height

Fig.3 The surface roughness for different eco-mat type and laying mode

Fig.4 Sand transport capacity variability at sand surface and different eco-mat type and laying mode

Fig.5 Mean temperature at different soil depths and temporal variation of soil temperature at 0-100 cm layer under quicksand and eco-mat cover

Fig.6 Precipitation during experiment and the temporal variation dynamic of soil water at different depths under quicksand and eco-mat cover

Table 1 Statistical characteristics and vertical variation hierarchical division of soil water under quicksand and eco-mat cover

类型	深度 /cm	样本数	土壤含水量/%					变异系数 /%	层次
类型	深度 /cm	样本数	最大值	最小值	平均值	中值	标准差	变异系数 /%	层次
流沙	0~20	681	6.6	0.2	2.36	2.1	1.11	46.78	速变层
	20~40	681	4.1	0.3	2.01	1.9	0.66	32.76	平缓层
	40~60	681	2.1	0.2	1.58	1.7	0.52	32.95	稳定层
	60~80	681	1.7	0.3	1.13	1.2	0.35	30.82
	80~100	681	0.8	0.3	0.53	0.5	0.17	31.36
生态垫覆盖	0~20	681	6.8	0.4	2.13	2.2	1.22	57.37	速变层
	20~40	681	5.6	0.1	2.37	2.5	1.06	44.66	平缓层
	40~60	681	4.6	0.5	2.53	2.6	0.98	38.71	稳定层
	60~80	681	2.0	0.4	1.45	1.6	0.45	30.84
	80~100	681	1.2	0.3	0.97	1.1	0.31	31.70

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The influence of eco-mat laying on sand fixation and soil temperature and humidity

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