Studies On Sand-fixing Effect Of Biological Crust Of Artificial Algae

Biological crust played important roles in preventing desertification, soil corrosion, and changing moisture distribution and movement. In recent years, many researchers at home and abroad had made a lot of studies deeply, but the study on still in the stage of experiment. The preliminary researches on the characteristics of artificial algae biological crust and its inoculated and development situation of field large area recently were studied in this paper. The results showed that appropriate shading and watering were beneficial to the growth and development of desert alga. The governance model of grass-alga-shrub was the most perfect in the governance model of alga. The psammophytes of Agriophyllum squarrosum, Allium mongolicum Regel, Elymus chinense appeared in order and coverage was increased gradually with the thicker crust layer after three months of desert alga growth on the quicksand face. The succession of dune was flowing dune- half fixed dune -fixed dune, and the quicksand was fixed finally. The artificial desert alga crust growing the face of quicksand could change the soil physicochemical properties. The soil moisture was increased with the thicker crust layer, and there was a downward trend of pH with the thicker crust layer. But the value of pH was greater than seven and showed weak alkaline. The content of available nutrient was also increased with the thicker crust layer, of which available nitrogen content changed significantly and available phosphorus content had a little change. Moreover, the content of available phosphorus was far lower than available nitrogen. Meanwhile, the content of organic matter, total nitrogen and total phosphorus was also increased with the thicker crust layer. The study provided a more effective and systematical evidence for desertification control by using the desert alga.