According to the composition characteristics of the ecosystem, a module sand barrier has been artificially constructed on moving sandy dune, which integrates sand fixation, partial soil improvement and vegetation restoration. To understand the influence of the module sand barrier on the biological characteristics of soil, soil microorganism amount and enzyme activity have been measured, and the variation of them inside and around the module sand barrier has been studied after construction for five years. The results show that inside the module sand barrier, the total amount of soil microorganisms was 1.91 times that of the one at 0-10 cm layer in the control plot, the amount of bacteria, fungi and actinomycetes were 0.83 times, 0.87 times and 2.14 times higher than those in the control plot, and the sucrase and urease activities were increased by 2.01 times and 29.41% than those in the control plot. Moreover, the artificially constructed module sand barrier and its internal filling matrix can improve the soil microorganism amount, sucrase and urease activities during 0 to 70 cm of the windward side or leeward side of the module sand barrier, and the formed fertility island effect can improve the biochemical characteristics of the soil.
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