| Biology and Soil |
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| Discussion on Wind Factor Influencing the Distribution of Biological Soil Crusts on Surface of Sand Dunes |
| WU Yong-sheng1,2, Has Erden2, QU Zhi-qiang3 |
1.Institute of Water Resources for Pastoral Area, Ministry of Water Resources of China, Huhhot 010020, China;
2.College of Resource Science and Technology, Beijing Normal University,Beijing 100875, China;
3.Ministry of Civil Affair & Ministry of Education Academy of Disaster Reduction and Emergency Management, Beijing Normal University, Beijing 100875, China |
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Abstract Biological soil crusts are widespread in arid and semi-arid areas, and their formation and development have significant effects on rehabilitation process of desert ecosystem. Air flow pattern and developmental characteristics of biological soil crusts on fixed sand dunes are studied by field observation method. Results indicate that near surface air flow on windward slope of sand dunes shows an increasing trend from the base to the top and reaches the highest point at the crest. At lee side, although near surface air flow has a little increase at lower part of the slope after initial sudden decrease at upper part of the slope, but its overall trend turns up to decreasing from the crest. Wind velocity variation coefficient is varied at different heights over each observation site. The thickness, gear strength and percentage of fine particles of biological soil crusts decrease from the base of slope to the upper part, showing biological soil crusts are less developed in high wind speed area and well developed in low wind speed area. This indicates that change of airflow pattern caused by topography could be the key factor affecting the distribution of biological soil crusts at different location of sand dunes.
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Received: 25 November 2011
Published: 20 July 2012
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2012, Vol. 32 
