关键词: 荒漠化, 脲酶, 胶凝液, 生物矿化固沙, 联合固沙

Abstract: The large distribution of desertified land is one of the significant causes of frequent sand and dust weather. To effectively prevent and stabilize sand, two key challenges need to be addressed: one is to stabilize the sand and prevent it from flying up, and the other is to enhance the effectiveness and longevity of sand stabilization techniques. Biomineralization technology, as an innovative approach, has been studied to address the challenge of long-term sand fixation. Laboratory and field tests have proven the feasibility and applicability of bio-mineralization technology for long-term sand fixation. The study encompasses tests such as urease activity tests, calcification tests, and wind erosion tests. The effects of urease activity, gelation solution concentration, pH value, perfusion times, perfusion volume, and temperature on sand fixation by the bio-mineralization method were analyzed. Based on these tests, a combined sand fixation technology system of biomineralization-plant-fence is proposed. The longevity and effectiveness of sand fixation using this combined technology system have been validated through wind tunnel experiments and field engineering sand fixation tests. The effect of the biomineralization solidified sand on sunny days is the best in the field and can be more favorable to achieve long effect of the solidified sand.

Key words: desertification, urease, cemented solution, solidifying desert sand by biomineralization, combined solidification desert sand