Effects of Salix psammophila checkerboard sand barrier on the distribution and characteristics of sand particle size in Kubuqi Desert

In order to study the effect of Salix psammophila checkerboard sand barrier on the composition and characteristics of particle size quantitatively,the drifting sand dune(LS),the sand dune with sand barrier of two years(TS) and the sand dune with sand barrier of six years(SS) were studied.Samples were taken on different parts of sand dunes and in different layers of sand and on different positions of checkerboard sand barrier,and composition and characteristics of particle size were studied.The results can be seen as follows:(1) with the sand barrier setting time increases,the content of silt and clay increases and the content of fine sand deceases.The content of silt and clay of SS shows significant difference with the content of silt and clay of TS and LS,when there is no significant difference between TS and LS;There is no significant difference in the content of each particle size in the three sand layers of LS and TS,but the volume content of silt,clay and fine sand of 0-5cm of SS is different from the two other layers.(2),The rangeability of frequency distribution curve of SS is smaller than the rangeability of TS and LS.The order of average particle MZ,sorting coefficient δ,skewness SK and kurtosis KG of each sand dunes is SSTSLS,each particle parameters of SS are significant different from the two other sand dunes,and there is no significant difference between TS and LS,and the order of each particle parameters of each layers of SS and TS is 0-5cm5-10cm10-15cm,but the particle parameters of each layers of LS have no significant difference.(3) The content of silt and clay of SS and TS on the northwest and southeast corner of the checkerboard sand barrier is bigger than the content in the center of the checkerboard sand barrier,and each particle parameters in the center of the checkerboard sand barrier are smaller than the ones on the northwest and southeast corner.