Study On Effects Of Soil Physical Properties And Protection Benefits By PLA Sand Barrier

The study focus on PLA sand barrier,it was fibre irrigatting sand, through testing speed of wind, sand-transporting quantity, concave surface characteristic of square grid and soil physical properties, vegetation restoration of 1m×1m,2m×2m,3m×3m specifications PLA sand barrier. Analysing effect of sand-fixed benefit, soil physical properties and vegetation by PLA sand barrier, and comparing the bare sand and the straw barrier which are the same specification as PLA sand barrier and got the following conclusions:(1)From the contrast the declare level of wind speed and the roughness of the surface performanced: PLA sand barrier>straw barrier>the control; the wind profile of the PLA sand barrier and straw barriers was "S", and the wind profile was fit for exponential distribution. Comparing to the three specifications of sand barrier, with the specification larger, the effects of wind speed reducing was worse and roughness of the surface was smaller, furthermore, shape "S" becomed not as clear as before and gradually it was more close to the shape of the wind profile of the control.(2) 0~30cm sand-transporting quantity of PLA sand barrier had great fluctuations, followed by wheat straw sand barrier and straw sand barrier overall trends were similar to the control. With the height increasing, sand-transporting quantity tends to declare. PLA sand barrier of 1m×1m had the greatest effect on sand-transporting quantity, the second was 2m×2m, 3m×3m was the minimum, however, the trends of sand-transporting quantity of 3 specifications straw barriers were nearly the same as comparison.(3)Form of square grid concave surface of PLA sand barrier was regular, and surface was smooth. The hight of the concave surface 4 sides of the straw barrier were lower than 4 corners, there were different hight on surface and was not as smooth as PLA sand barrier. Suspect that N-S and W-S curves fit quadratic function, but the coefficient R2 of the 1m×1m concave surface was the highest, followed by 2m×2m, 3m×3m was the worst, the opening of the N-S curve was small and the level of the curve concave was larger than W-S, with the size increasing, the erosion coefficient of PLA sand barrier and straw sand barrier both decrease, and all the coefficient of specifications were less than 1/10.