3.5. Relationship of CO2 flux and temperature, moisture Correlation analysis revealed a good relationship between CO2 flux and temperature for the total 47 days with r ranging from 0.285 to 0.773 and the last 20 days with r ranging from 0.679 to 0.802 (Table 3, Fig. 2). Soil CO2 flux significantly correlated with soil moisture content at all the positions except toe-slope for the total 47 days. For the initial 27 days, only a weak relationship between CO2 flux and soil moisture content could be found at summit and toe-slope (r = 0.386 and 0.397, respectively; p < 0.001); however,this relationship was closer at all the positions except back-slope for the last 20 days (Table 3, Fig. 2). Correlation analysis between soil temperature and soil moisture content revealed a good relationship for the total 47 days and the last 20 days with r ranging from 0.496 to 0.710 and 0.320 to 0.680, respectively, most of which are greater than 0.500. However, there was no significant correlation between soil temperature and soil moisture content for the initial 27 days (data not shown). A multiple regression analysis revealed a good relationship between CO2 flux and soil moisture content in the initial 27 days (p < 0.05), and a good relationship between CO2 flux and soil temperature in the last 20 days (p < 0.001). Position had significant effect on CO2 flux both in the initial 27 days and the last 20 days (Table 4). Regression analysis between CO2 flux and soil temperature and soil moisture content at four positions revealed a first-order relationship for soil temperature and second-order relationship for soil moisture content (Fig. 3)