Effect of Sandbag Barrier on the Ecosystem in Highway in Sandyland | 沙袋沙障对沙地公路路域生态系统的影响

chinois. 【目的】研究不同规格沙袋沙障对浑善达克沙地的防风固沙效益、土壤改良以及植被恢复的作用。【方法】在浑善达克沙地布设1．0m×1．0m、1．5m×1．5m、2．0m×2．0m 3种沙袋沙障，并设置对照样地，每块样地均为20m×20m。从地表风速、土壤理化性质、地表植被组成和群落丰富度等方面对沙袋沙障的防风固沙效益进行7a的研究。【结果】布设1．0m×1．0m、1．5m×1．5m、2．0m×2．0m沙障的样地比对照样地的地表粗糙度分别提高了116倍、62．17倍、12．83倍，而植被盖度分别增加了12．3倍、9．5倍、5．39倍，Shannon―Wiener指数（H）与群落丰富度指数（IMA）明显增大。【结论】1．0m×1．0m的沙袋沙障综合防护效益最佳，1．5m×1．5m和2．0m×2．0m沙障的防护效果稍差，在7a中土壤的理化性质逐年提高，地表粗糙度先增大后减小。

anglais. [Objective] The aim of this study was to explore the different effect of sandbag barrier on wind-breaking, sand-fixing, soil improvement and vegetation restoration in Hunshandake Sandyland. [Method] Analyze the observational data from 1.0 m×1.0 m, 1.5 m × 1.5 m, 2.0 m × 2.0 m sandbag barrier plots and control plot, Each plot is 20 m×20 m. Discuss the Sand-fixing function from the following points, the land surface＇s wind speed, soil physical and chemical properties, vegetation composition and community richness during 7 years. [Results] The roughness of 1.0 m×1.0 m,1.5 m×1.5 m.2.0 m×2.0 m sandbag barrier plot is 116, 62.17, 12.83 times higher than that in the control plot respectively. And the surface vegetation coverage of 1.0 m × 1.0 m.1.5 m×1.5 m.2.0 m×2.0 m sandbag barrier plot is 12.3, 9.5, 5.39 times higher than that in the control plot respectively. H index and IMA index significantly increase. [Conclusion] The Sand-fixing function of 1.0 m× 1.0 m the complex protect benefit is better than others, the Sand-fixing function of 1.5 m×1.5 m,2.0 m×2.0 m sandbag barrier is weaker. The physical and chemical properties of the soil increases every year, the surface roughness first increases and then decreases during 7 years.