Study on the Characteristics of Soil Parameter Changes and Factors Influencing Thermal Conductivity in the Gurbantunggut Desert
Taking the Gurbantunggut desert as the research target,the main soil parameters and influencing factors of the Gurbantunggut desert were analyzed by using the continuous observation data of the Kelameili Land-Air Interaction Observation Experimental Station in 2020.The results showed that:(1)The annual daily mean change of soil temperature in the Gurbantunggut desert showed an inverted"U"shape,and the seasonal variation characteristics were obvious,which generally showed that the change range of shallow soil temperature was greater than that of deep layer,and summer>spring＞autumn>winter,and the humidity change was high in spring and summer and low in autumn and winter,which was usually characterized by a gradual increase in soil moisture with the increase of soil depth,and the overall change of soil heat flux was high in spring and summer,low in autumn and winter,and the diurnal variation range decreased in spring,summer,autumn and winter.(2)The average annual thermal conductivity of soil in the Gurbantunggut desert was 0.832 W·m-1·K-1,the thermal conductivity was significantly positively correlated with precipitation,and soil temperature,humidity and soil salinity were the main factors affecting soil thermal conductivity in desert areas.Under permafrost conditions,the average soil thermal conductivity was 0.634 W·m-1·K-1,and it increased with the increase of soil moisture,the rate of heat conductivity increased with humidity during frozen soil was about 2.5 times that of non-frozen soil,and under precipitation conditions,the soil thermal conductivity increased slowly when the soil moisture content was less than 0.06 m3·m-3,and increased rapidly with the increase of humidity when the soil moisture content is greater than 0.06 m3·m-3,and increased slowly with the increase of humidity when the soil water content was less than 0.11 m3·m-3 during the snowmelt period,and increased rapidly with the increase of humidity when the soil water content was less than 0.11 m3·m-3.
万方数据
维普
