Abstract:

Soil temperature is an important environmental factor in wetland climate, the study on soil temperature will be helpful to understand the changes of soil respiration. In this paper, soil temperature profile data was analyzed from 0 to -80 cm at Phragmites swamp in panjin wetland ecosystem research station since 2005 to 2009. The result suggested that: soil temperature diurnal variation of Phragmites swamp expressed as a sine curve, and its amplitude decreased from the surface to deep layer. There was almost no diurnal variation under the depth of -40 cm. In March, daily variation range of soil temperature was minimum all of the year, and maximum in the growing season. Seasonal change of soil section temperature showed that: soil temperature gradient was obvious in winter, for the heat transferred slowly; in summer, heat transferred quickly, and temperature gradient was small, and minimum in September. The changes of soil temperature would affect the growth of reed plant, especially in the period of budding and root development. Research results could provide the references for the changes of carbon flux in wetland.