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JOURNAL OF DESERT RESEARCH  2012, Vol. 32 Issue (6): 1576-1582    DOI:
Biology and Soil     
Spatial Pattern of Soil Moisture Affected by Runoff in Desert Shrubland Area of Tengger Desert
LI Xiao-jun
Shapotou Desert Research and Experiment Station, Cold and Arid Regions Environment and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
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Abstract  

Soil moisture is a major control and driving factor on multi-scale ecohydrological processes, and is also a key parameter to many aspects of ecological, hydrological, meteorological and geomorphic research; it has high spatial and temporal variability in land-surface hydrologic systems. The patch-scale soil moisture at different soil depth in three microenvironments (inside the shrub, the margins of the shrub canopy and outside the shrub) of three species was investigated immediately after precipitation event, and results show that the spatial pattern of soil moisture at individual scale of Salsola passerina shrub is that soil moisture in the margin of the shrub>inside the shrub>outside the shrub, while the spatial pattern of Ceratoides latens shrub is that inside the shrub>margin of the shrub>outside the shrub, and no significant differences are found among the three microenvironments of Caragana stenophylla shrubs. Slope gradient trend of soil moisture is found between the upslope and downslope in the same microenvironment under S. passerina and C. latens shrubs. Soil moisture at upslope of all the three microenvironments of the S. passerina shrub is greater than those at the downslope of the shrub, while soil moisture at upslope of the margin of C. latens shrub is less than that at the downslope of the shrub, and no remarkable slope gradient trend is found for the other two microenvironments of C. latens and for all three microenvironments of C. stenophylla shrub. No noticeable vertical soil moisture gradient trend is found in different microenvironments of these three shrubs. The investigation results of spatial pattern of soil moisture induced by runoff in patchy vegetation areas suggests that the differences in responses of different shrub patches to rainfall event lead to the generation of runoff and the induced resource redistribution, which results in the spatial heterogeneity of soil moisture in the landscape.

Key words:  runoff      soil moisture      shrubland microenvironments      spatial heterogeneity      Tengger Desert     
Received:  18 November 2011      Published:  01 December 2011
ZTFLH:  S152.7  
Articles by authors
LI Xiao-jun

Cite this article: 

LI Xiao-jun. Spatial Pattern of Soil Moisture Affected by Runoff in Desert Shrubland Area of Tengger Desert. JOURNAL OF DESERT RESEARCH, 2012, 32(6): 1576-1582.

URL: 

http://www.desert.ac.cn/EN/     OR     http://www.desert.ac.cn/EN/Y2012/V32/I6/1576

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