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| Temporal and Spatial Variation of Soil Moisture in Dunes with Different Vegetation Coverage in Southern Margin of the Mu Us Sandy Land |
| Wu Yongqiu1, Zhang Jianfeng1, Du Shisong1, Hasi Eerdun2, Huang Wenmin1 |
1. MOE Engineering Center of Desertification and Blown-sand Control at Beijing Normal University/State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China;
2. College of Resources Science & Technology, Beijing Normal University, Beijing 100875, China |
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Abstract This research is focused on three types of sand dunes(shifting dune, semi-shifting dune and fixed dune) that are typical to the southern borderline of the Mu Us Sandy Land. Soil moisture was measured for samples from a variety of depths ranging from 0 to 100 cm and from representative locations such as the windward slope, the dune top and the leeward slope. The sampling was conducted from April through October, twice a month, in both 2011 and 2012. The characteristics of the spatial-temporal variation of the soil moisture were established:the overall soil moisture of the three types of sand dunes demonstrates a pattern of fixed dune >semi-shifting dune >shifting dune. Seasonally, average soil moisture of each type of the sand dunes shows the same pattern of autumn >spring >summer. For all the three types of sand dunes, the soil moisture at different locations maintain the following pattern:the leeward slope near dune bottom >the windward slope >the dune top, while the average moisture levels at the windward slope and the dune top are quantitatively close during the two years under study. In terms of temporal variation, soil moisture at 0-10 cm depth exhibits the largest seasonal fluctuation, and shows a diminishing variation with greater depths. Vertical variation of the soil moisture in the sand dune increases from spring to summer, and then decreases from summer to autumn. Along the 0-100 cm depth, vertical variation of the soil moisture is in a negative correlation with the soil moisture level:higher overall soil moisture, lower the vertical variation. Four distinct periodical phases of soil moisture can be identified for the three types of sand dunes in the region:April and May is the spring slow accumulation phase, June to August is the summer depleting phase, September to November is the autumn accumulation phase, and December to March is the winter stable phase. Overall, natural vegetation conserves more than consumes the moisture, and precipitation in the region is able to sustain the natural vegetation on the different types of sand dunes.
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Received: 23 July 2014
Published: 20 November 2015
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2015, Vol. 35 
