【摘要】 为了研究莫莫格湿地不同下垫面土壤冻融期的水热变化特征,在裸地、低湿草甸和草原草甸设置观测区,于2017年10月28日～2018年4月18日期间,观测土壤温度和含水率,对比不同下垫面的土壤温度和含水率的变化规律。研究结果表明,与裸地相比,有枯萎植物覆盖的低湿草甸和草原草甸土壤冻结和消融的时间都滞后,且冻结时间增加;在2018年1月,日平均土壤温度最低,在3个观测深度中,5 cm深度的土温相对最低,裸地、低湿草甸和草原草甸5 cm深度的土壤温度分别为-14.31℃、-13.21℃和-15.22℃;枯萎植物覆盖对土壤温度的影响具有双重性,在土壤冻结阶段,其具有保温作用,在土壤融化阶段,其使土壤升温较慢;低湿草甸土壤比裸地具有更好的保水能力,在土壤融化阶段,融雪水使土壤含水率增加。更多还原

【Abstract】 In order to study the changes of soil hydrothermal regime in freezing and thawing period under different underlying surfaces in Momoge wetland, the observation areas were set in low humidity meadow,steppe meadow and bare land. Soil temperatures and soil moistures were determined from October 28, 2017 to April 18, 2018. The results showed that the thawing and freezing started-time of soil were later and the duration of freezing were longer with withered plants in low humidity meadow and steppe meadow than those without withered plants in bare land. The lowest soil temperature occurred in January of 2018. The lowest soil temperatures were occurred at 5 cm depth in the three depths which were-14.31 ℃,-13.21 ℃ and-15.22 ℃in bare land, low humidity meadow and steppe meadow. There was a duality for the soil temperature by withered plants. It prevented the soil temperature to become low in freeze process and restrained the soil temperature rising in thawing process. The soil moisture in low humidity meadow was higher than that of bare land,soil moisture were increased by snowmelt.更多还原