Purpose The study would be expected to reveal more accurately the dynamic change rule of soil water content and the characteristics of small scale spatial variation in the process of desertification combating and provide a scientific reference for the sustainable development of sand combating and vegetation in this area.
Method In this study, the soil moisture content was monitored by oven drying method and TDR300, by applying statistics theory and methods studied on the seasonal dynamics and small scale spatial variation of soil moisture in the shallow soil.
Result (1) The variation coefficients of soil moisture content were between 0.01-1 which was moderate variation. The soil moisture content showed strong spatial autocorrelation both the depth of 10 cm and 30 cm, respectively. The variogram of soil moisture (10 cm) was spherical mode in April, June and September; and exponential model (10 cm) in August, the variogram of soil moisture was exponential model in 30 cm. (2) The spatial distribution of soil moisture content (10 cm) of April, June and September were similar, and was relatively even. The soil moisture of August was higher than June, and the spatial distribution was decreasing from north to south. The northwest corner had the highest soil moisture content. The soil moisture of September was highest in all months.
Conclusion The soil moisture content was the moderate variation in the depth of 10 cm and 30 cm, and showed strong spatial autocorrelation. The soil moisture content (10 cm) of distribution patterns had been affected by precipitation in the depth of 10 cm and 30 cm, the September had the highest soil moisture content. In the study area, the soil moisture content in the different period of spatial distribution patterns were significantly different, the soil moisture content (30 cm) changes with the season, and the spatial distribution patterns of both were affected by the topography and season.
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