Temporal and Spatial Variation of Soil Water in Sand Dunes at Eco-tone Between Oasis and Desert
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ABSTRACT:
The eco2tone between oasis and desert is a important zone for vegetation restoration1 The key for vegetation restoration is to know the soil water content of dune. The temporal and spatial variation of soilw ater content in sanddunes in Zhangye city w asmeasured continuously from October in 2003 to October in 2004, and the
application of eco-mat to combating desertification was studied. The records showed that the dynamic variation of
soil water content was affected by precipitation, vegetation and surface coverage, and the monthly change of soil water content lagged behind the precipitation1 The variation coefficients decreased with increasing soil depth, and decreased when covered with eco-mat (CV =4143%).The soil water content was significantly different between shifting dune and fixed dune. Soil water content of shifting dune in upper layer (1119%`1127% )was lower than
fixed dunes(1161%`1175%) , while the other layers was reverse; the soil water content of sh ifting dune
(1127%`1173%) increased from the foot of dune to the crest, while the fixed dune (1175%`1111%) was reverse. Additionally, by using standard deviation and variation coefficient, the vertical layers of soilw ater content
were divided into three layers, i.e., rapid change layer, active layer and sub-active layer, respectively. Correlation
analysisw as applied to analyze the relationsh ip of soilw ater content among different layers and coefficients of soil
water content and means of all layers under eco-mat condition. The study show ed that the eco-mat could maintain
soil water content of dunes effectively, and meanwhile, p rovided a new mode of desertification combating.
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STATISTICS
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