Abstract: The soil respiration rate was measured with an IRGA in the natural Larix gmelinii forest of the Northern Great Xing'anling Mountain in the cool temperate zone.The environmental factors were recorded using the weather equipment.The soil respiration showed obvious diurnal variation and a total 706 gC·m^-2 was released during the plant growth period(May.1^th～Oct.31^th).The soil respiration rate was influenced significantly by soil tempeture in this zone,and a significant postive correlation was found between soil respiration rates and soil tempetures in 10 cm depth(r=0.879 5).However the soil respiration was not significantly influenced by the soil moisture.Furthmore,there was a negative relationship between the soil respiration rate and air CO₂ contiontration of the air in forest(r=-0.426 1).The results from the experiment can provide the basical materials for the calculation of carbon flux in the northern cool temperate zone of China.

Key words: soil respiration rate, soil temperature, Larix gmelinii forest, the Great Xing'anling Mountain