以吉兰泰盐湖北部流沙区铺设8 a的不同规格聚乳酸（PLA）沙障内沉积物为研究对象，利用激光衍射技术分析了沙丘表层0~3 cm沉积物粒度组成，计算并分析平均粒径、标准偏差等粒度参数，探讨了影响障内沉积物相对粗细的关键组分，分析PLA沙障的防沙效益。结果表明：PLA沙障内沉积物以细沙、中沙、极细沙为主。中沙、极细沙、细沙是障内沉积物的关键组分。PLA沙障的阻滞作用使得中沙、粗沙含量百分比升高，细颗粒含量百分比降低，障内沙粒分选性逐渐变差，峰态偏离正态分布，向负偏方向发展，频率分布曲线分布范围变宽，累积频率曲线变缓，表层颗粒组成趋于粗化。1 m×1 m规格PLA沙障内均以积沙为主；沙丘迎风坡和背风坡的2 m×2 m、3 m×3 m沙障内均为积沙状态，丘顶则为风蚀状态。综合考虑沙障铺设成本和防护效果，得出研究区域内2 m×2 m规格PLA沙障整体防沙效益最佳。
In this research, the surface layer(0-3 cm) of different specifications PLA(Poly Lactic Acid) sand barriers in the northern Jilantai Salt Lake was selected to analyse the grain-size characteristics. The sediment particle size distributions were identified by using laser diffraction technique. The grain-size characteristics parameters, such as average particle size, sorting, skewness and kurtosis were determined, then calculated and analysed sand-fixation benefits of sand barriers. The results indicated that the sediment particle size was mainly made up of fine sand, medium sand and very fine sand. The medium sand, very fine sand and fine sand were the key factors that affected the sediment particle thickness in the sand barriers. The PLA sand barrier increased the content of medium sand and coarse sand, decreased the content of fine particles, and the sorting became worse, the kurtosis deviated from normal distribution and turned negative partial. The frequency distribution curves became wider, while the cumulative frequency curve became slow. The sediment particle size distributions tended to be coarsen. The sand drift activities inside the 1m 1m specification PLA sand barriers on the entire sand dune was deposition. The sand drift activities in 2m 2m and 3m 3m sand barriers at windward and leeward slope performed as deposition as well, while the top of sand dune was erosion. Considering laying costs and protective effects, 2m 2m was the best specification of PLA sand barriers for the study area.
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