The Comparative Analysis under the Different Vegetation Typeson the Soil Moisture and Physical Properties in Saihanwula Nature Reserve

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 .