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[Objective] By analyzing the effects of different mixed forest patterns on the soil particle characteristics of the Kubuqi Desert, this study provides scientific basis for the efficient and sustainable management of sandy land forests. [Methods] Four representative mixed-forest configuration patterns along the section of the Yellow River in Kubuzi Desert were selected. Soil samples were taken from 0—80 cm soil depth. The laser particle size method was used for the determination of soil particle size and calculation of the mean soil particle size (Mz), sorting coefficient (δ), skewness (SK), kurtosis (KG), and fractal dimensional characteristics. [Results] (1) The dominant grain sizes in the study area were fine sand and medium sand. The four different vegetation configuration patterns had a significant refining effect on soil grain size, and the content of clay, silt, and very fine sand increased by 141.37%～415.38%, 105.75%～724.73%, and 64.93%～1597.36%, respectively, compared with the control group CK. (2) After the camping of the four vegetation configuration modes, the average grain size of the soil layer at different depths increased significantly, ranging from 2.44%～20.33%. (3) After comparing the grain size parameters of the soil under different configuration modes, it was found that the value of fractal dimension was positively correlated with the value of kurtosis and negatively correlated with the average grain size. [Conclusion] The degree of soil particle size refinement is related to the configuration mode. Different plant configuration modes on soil particle size refinement are mainly concentrated in the surface layer, and the effect of refinement gradually reduces with the increase of soil layer depth. The average particle size of soil layer at different depths increases significantly, the sorting grade of soil particles decreases, and the particle distribution becomes more discrete. The distribution of soil particles shows a gradual tendency to be broad and flat. The soil particles develop toward positive bias. The fractal dimension of soil particles at different depths of soil layer increases significantly (p＜0.05). [ABSTRACT FROM AUTHOR]

[Objective] The aims of this study are to investigate the soil mechanical composition and ecological effect under the protection forest of sandy land near Qehan Dry Salt Lake, and to provide scientific and technological support for local protection forest construction and sandy land management. [Methods] The soil samples of 0 20 cm were collected in inter-belt root neck and under canopy of two protection forests. Tamarix chinensis and Haloxylon ammodendron on the southern edge of Qehan Dry Salt Lake. The mechanical composition of soil samples was measured by laser particle sizer. And the average particle size, standard deviation, skewness., peak state and fractal dimension were calculated and analyzed. [Results] (1) The soil mechanical composition is mainly composed of sand particles, compared to bare sand (CK), the total contents of clay and silt increased by 5.19%, 0.59% 20.44% and 1.53%, 3.93% 4.32% in Tamarix chinensis and Haloxylon ammodendron (inter-belt, root neck and under canopy), respectively, with the most pronounced performance under canopy. (2) Soil sort ability was poor under shelterbelts, with a positive skewness towards a narrower tips the fractal dimensions was between 2.13~2.70. higher under both shelterbelt canopies than between strips and root necks and the overall particle size tended towards finer particles compared to CK. (3) Soil particle size frequencies revealed low slopes at all locations in the shelterbelts, indicating that the particle size class richness of both shelterbelts was better than those in the control. [Conclusion] The particle size parameters and sub-dimensional values reflect the improvement of the local sandy land by the two protected forests, with the trend of fine-grained soil under the red willow protection forest more obvious. [ABSTRACT FROM AUTHOR]

With the increase of rainfall intensity, the peak runoff yield increased by 6.70 L on average when the slope was 5~25°. When the rainfall intensity is 0.6~2.0 mm/L. the inflection point of the sediment yield increase rate will appear between the slope of 15~20°. [Conclusion] The research results can provide a theoretical reference for the comprehensive prevention and control of soil and water loss in desert steppe areas, which is helpful in improving the ecological environment of desert steppe regions and carrying out soil and water conservation efforts in this area. With the increase of rainfall intensity, the peak runoff yield increased by 6.70 L on average when the slope was 5~25°. When the rainfall intensity is 0.6~2.0 mm/L. the inflection point of the sediment yield increase rate will appear between the slope of 15~20°. [Conclusion] The research results can provide a theoretical reference for the comprehensive prevention and control of soil and water loss in desert steppe areas, which is helpful in improving the ecological environment of desert steppe regions and carrying out soil and water conservation efforts in this area. [ABSTRACT FROM AUTHOR]

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