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[1]TANG Yan,LIU Lian-you,YANG Zhi-peng,et al.Soil Moisture and Grain Size Characteristic of Typical Nebkhas in South Edge of Mu Us Sandland[J].Research of Soil and Water Conservation,2009,16(02):6-9.

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Soil Moisture and Grain Size Characteristic of Typical Nebkhas in South Edge of Mu Us Sandland

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 16 Number of periods: 2009 02 Page number: 6-9 Column: Public date: 2009-04-20

Title:: Soil Moisture and Grain Size Characteristic of Typical Nebkhas in South Edge of Mu Us Sandland

Author(s):: TANG Yan¹, LIU Lian-you², YANG Zhi-peng¹, DU Jian-hui¹, MENG Xiang-liang³; 1. College of Resources Science and Technology, Beijing Normal University, Beijing, 100875, China;
2. Key Laboratory of Environment Change and Natural Disaster, Ministry of Education, Beijing Normal University, Beijing, 100875, China;
3. Environmental Monitoring Station in Shanddong, Ji’nan, 250013, China

Keywords:: nebkhas; soil moisture; grain size; spatial-temporal characteristic

CLC:: S152.7

DOI:: -

Abstract:: Soil moisture and particle size are important for the vegetation and evolvement of nabkhas.Based on the measurement of particle size and soil moisture in April and July of typical nebkhas in the Mu Us Sandland,the paper reveals the spatial-temporal characteristics of soil moisture at different position of the nebkhas,and the distribution law of particle size:Due to the measurement that was made 1 hour after the rainfall in July,soil moisture fell with the depth in 0-10 cm soil layer of interdune and dunetop.Soil layer of interdune from 0 cm to 70 cm was influenced by environmental factors such as vegetation,rainfall and solar radiation.At the dunetop,the topsoil was covered by old wattle of shrub,which restrained the evaporation of soil moisture in 0-30 cm soil layer,increased roughness,reduced wind speed and sand blown activity,and supplied a method to maintain water balance; in 30-80 cm soil layer,soil moisture was richer in July than in April,because July was in rainy season,rainwater infiltration lead to rich soil water.Wind condition,vegetation and dune activity decided the soil moisture change at different position.Root distribution and vegetation decided soil water dynamic and the depth that inflexion occurred.The particle size characteristic was similar that fine sand content was the highest at windward,dunttop,leeward and interdune.In vertical structure,fine sand and very fine sand were high and silt was latter.Clay,medium sand,sand content changed little with the depth,very fine sand and fine sand content changed a lot with the depth.

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