A Preliminary Study on dynamics of Soil Water Content of the Fixed Dune in Ketu Sand Land on the East of Qinghai Lake

• 1、Key laboratory of Environmental Changes and Natural Disaster, the Ministry of Education of China, Beijing Normal University
• 2、Key laboratory of Environmental Changes and Natural Disaster, the Ministry of Education of China, Beijing Normal University, Beijing 100875
• 3、College of Life Sciences, Beijing Normal University, Beijing 100875, China

Abstract：By observing soil water content, integrating rainfall monitoring and surface sediments particle size analysis, we studied the dynamics of soil water content preliminarily at different geomorphological locations of the fixed dune in Ketu sand land on the east of Qinghai Lake. The results showed that from 0～100cm the soil water content of the interdunal areas was the highest, dune top and leeward slop was the second, and windward slop was the lowest. On the vertical profile, under the influence of groundwater, both the dune slack next to the windward slope and the feet of windward slope had critical depth, separately, 40cm and 100cm. Above the critical depth, the soil water content changed little, whereas below it the soil water content increased rapidly with depth. While the soil water content of other geomorphological locations, whose major source was precipitation, increased with depth during 0～20cm, while the changes were complicated below 20cm.

Keywords： soil water content fixed dune precipitation temporal and spatial variation