Space Structure of Soil Water and Salt Information and Density in the Vertical Direction

YANG Shu-qing,SHI Hai-bin,LI Wei-ping,ZHENG He-xiang,MA Jin-hui(Inner Mongolia Agriculture University,Huhehot 010018,China)

the information of soil water and salt;vertical structural space;density

Through the determination of the soil moisture content and value of the EC,we use the geostatistics theoretical to research the space structure of soil water and salt in the vertical direction and changes of density in the vertical direction.Statistical analysis showed that the variability of water is less than the salt.The Bulk density of the dispersion and spatial variation is very small in the vertical direction.The average bulk density is 1.48 g/cm3 in the 2.0 m deep vertical profile.We used the method of OK to estimates the information of regional water and salt The results showed that,between the II and I point the distribution characteristics and main differences of soil moisture content in the vertical profile is that the position of the drying layer is obviously lower than the level positions,surface and bottom water content changes in the scope of the basic line.Basically the EC distributing of II point keep the monotone decreasing state largely from 0 to 80 cm depth.Below 80 cm depth EC is a constant value basically.On the side profile of the I test pits,there is a clearly changes and EC arrive at the peak value in about 90 cm depth below the ground.Soil bulk density is basically stable in the following 80 cm soil depth and the soil bulk density is about 1.45 g/cm3,which is very close to the results of the statistical analysis 1.48 g/cm3.