[Effects of the grain size and thickness of dust deposits on soil water and salt movement in the hinterland of the Taklimakan Desert].
By using mcirolysimeter, a laboratory simulation experiment was conducted to study the effects of the grain size and thickness of dust deposits on the soil water evaporation and salt movement in the hinterland of the Taklimakan Desert. Under the same initial soil water content and deposition thickness condition, finer-textured (<0.063 mm) deposits promoted soil water evaporation, deeper soil desiccation, and surface soil salt accumulation, while coarse-textured (0.063-2 mm) deposits inhibited soil water evaporation and decreased deeper soil water loss and surface soil salt accumulation. The inhibition effect of the grain size of dust deposits on soil water evaporation had an inflection point at the grain size 0.20 mm, i. e., increased with increasing grain size when the grain size was 0.063-0.20 mm but decreased with increasing grain size when the grain size was > 0.20 mm. With the increasing thickness of dust deposits, its inhibition effect on soil water evaporation increased, and there existed a logarithmic relationship between the dust deposits thickness and water evaporation. Surface soil salt accumulation had a negative correlation with dust deposits thickness. In sum, the dust deposits in study area could affect the stability of arid desert ecosystem.
Sun
Yan-Wei
YW
Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, China. sunyanwei2002@126.com
Li
Sheng-Yu
SY
Xu
Xin-Wen
XW
Zhang
Jian-Guo
JG
Li
Ying
Y
D002681:China; D003889:Desert Climate; D004391:Dust / Q000032:analysis*; D017753:Ecosystem; D004784:Environmental Monitoring / Q000379:methods; D012492:Salts / Q000032:analysis*; D012987:Soil / Q000032:analysis*; D014867:Water / Q000032:analysis; D014872:Water Movements
D004391:Dust; D012492:Salts; D012987:Soil; D014867:Water