两种典型防护林对查干淖尔干盐湖沙化 地表土壤粒度特征的影响.

[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]