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In this thesis to Saihanwula Nature Reserve in the soil under six different vegetation types for the study , the use of soil science, the basic principles of the protection zone sandy grassland , forest edge meadow davidiana , birch forest, subalpine meadow the steppe soil moisture characteristics and physical comparative analysis , the results are as follows : ( 1 ) six kinds of different vegetation types under average soil water content from the surface downward, a downward trend. Different vegetation types of surface soil moisture content below the surface , deep soil moisture is relatively stable ; through analysis of variance between the soil moisture content to know the same vegetation type under different levels of soil moisture content and different vegetation types under the same level , there are significant differences ; due to the influence of meteorological factors on water , soil water content in July October ; standard deviation , variance , and the coefficient of variation (CV%) emerged as the soil depth in the vertical direction and tends to be smaller , protected areas soil moisture is a weak variation strength . ( 2 ) 6 different vegetation types , with soil depth , soil bulk density increasing trend , a downward trend in total soil porosity ; soil bulk density and soil moisture , soil porosity and soil water content correlation analysis showed that soil bulk density and soil moisture content was negatively related to sexual relations , soil porosity , soil moisture was positively correlated relationship .
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